KTR RADEX-NC RADEX-NC HT Operating/Mounting Instructions

RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
KTR-N
Sheet:
Edition:
47210 EN
1 of 37
11
RADEX®-NC
Backlash-free, torsionally stiff and
maintenance-free steel laminae
couplings
type DK and EK along with
combinations
according to directive 2014/34/EU
and UK directive SI 2016 No. 1107
Type DK
Type EK
RADEX®-NC HT
Backlash-free, torsionally stiff and
maintenance-free steel laminae
couplings
type DK and EK along with
combinations
according to directive 2014/34/EU
and UK directive SI 2016 No. 1107
Type DK
Type EK
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
KTR-N
Sheet:
Edition:
47210 EN
2 of 37
11
The RADEX®-NC and RADEX®-NC HT servo laminae coupling is a backlash-free, torsionally stiff and
flexible steel laminae coupling. It was developed specifically for applications in servo technology to
meet the demands for high torsional stiffness (e. g. with use on indexing tables, planetary and worm
gears, ball spindles, etc.).
Table of contents
1
2
3
4
Technical data
4
1.1
1.2
4
5
Types of hubs
Coupling dimensions
Advice
13
2.1
2.2
2.3
2.4
2.5
2.6
13
13
13
14
14
14
General advice
Safety and advice symbols
General hazard warnings
Intended use
Coupling selection
Reference to EC Machinery Directive 2006/42/EC
Storage, transport and packaging
15
3.1
3.2
15
15
Storage
Transport and packaging
Assembly
16
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
16
19
19
20
21
21
22
24
Components of the couplings
Advice for finish bore
Assembly of the hubs (general)
Assembly of clamping hubs (hub type 2.5, 2.6, 3.5 and 3.6)
Assembly of clamping ring hubs (hub type 6.5)
Disassembly of clamping ring hubs (hub type 6.5)
Assembly of laminae sets
Displacements - alignment of the couplings
5
Start-up
25
6
Breakdowns, causes and elimination
27
7
Disposal
28
8
Maintenance and service
29
9
Spares inventory, customer service addresses
29
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
KTR-N
Sheet:
Edition:
47210 EN
3 of 37
11
Table of contents
10
Enclosure A
Advice and instructions regarding the use in
10.1 Intended use in
potentially explosive atmospheres
potentially explosive atmospheres
10.2 Inspection intervals for couplings in
10.3 Visual inspection and measures
Please observe protection
note ISO 16016.
Drawn:
Verified:
31
potentially explosive atmospheres
10.4
marking of coupling for potentially explosive atmospheres
10.5 EU Certificate of conformity
10.6 UK Declaration of conformity
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
30
32
33
34
36
37
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
4 of 37
11
Technical data
1.1 Types of hubs
Type 2.5 1)
Clamping hub double slot
without feather keyway
Type 2.6
Clamping hub double slot
with feather keyway
Type 3.5 1)
Clamping hub triple slot
without feather keyway
(only available with
RADEX®-NC HT)
Type 3.6
Clamping hub triple slot
with feather keyway
(only available with
RADEX®-NC HT)
Type 6.5
Clamping ring hub
(only available with
RADEX®-NC HT)
Illustration 1: Types of hubs
1)
Hubs, clamping hubs or similar types without feather keyway may be used in category 3
only and are marked with category 3 accordingly.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
5 of 37
11
Technical data
1.2 Coupling dimensions
RADEX®-NC
Illustration 2: RADEX®-NC type Dk
Illustration 3: RADEX®-NC type DK
Table 1: Dimensions - RADEX®-NC (hub type 2.5/2.6)
Clamping screws
DIN EN ISO 4762
Dimensions [mm]
Size
5
10
15
20
25
35
42
Max. finish
bore D
12
15
20
25
35
42
55
DH
L1, L2
26
35
47
59
70
84
104
12
16
21
24
32
35
40
L
DK
34
44
55
67
88
98
116
EK
26.5
35.0
45.0
52.0
69.0
77.0
91.0
DBSE
DI1
E
T
M
TA [Nm]
10
12
13
19
24
28
36
12.0
14.5
19.5
24.0
30.0
38.0
48.0
2.5
3.0
3.0
4.0
5.0
7.0
11
3.5
5.0
6.8
6.5
9.0
10.5
10.5
M2.5
M4
M6
M6
M8
M10
M10
0.8
3
10
10
25
49
69
Table 2: Technical data - RADEX®-NC (hub type 2.5/2.6)
Size
5
10
15
20
25
35
42
TKN
[Nm]
2.5
7.5
20
30
60
100
300
TK max
[Nm]
5
15
40
60
120
200
600
Max. speed
[rpm]
18,300
13,600
10,100
8,050
6,800
5,650
4,550
Technical data
Torsional stiffness [Nm/rad]
DK
EK
1,200
2,400
2,800
5,600
6,000
12,000
15,000
30,000
30,000
60,000
36,000
72,000
120,000
240,000
Mass moment of inertia [kgm2]
DK
EK
0.000004
0.000003
0.000016
0.000012
0.000065
0.000053
0.000199
0.000154
0.000508
0.000393
0.001153
0.000911
0.007458
0.006153
RADEX®-NC couplings with attachments that can generate heat, sparks and static charging
(e. g. combinations with brake drums, brake disks, overload systems such as torque
limiters, fan impellers etc.) are not permitted for the use in potentially explosive
atmospheres. A separate analysis must be performed.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
6 of 37
11
Technical data
1.2 Coupling dimensions
Table 3:
Friction torques and surface pressure of RADEX®-NC clamping hubs (hub type 2.5)
Size
Material - hub
Clamping screw M
Tightening torque TA [Nm]
5
Al-H
M2.5
0.8
10
Al-H
M4
3
Bore Ø
1.1
175
1.8
101
2.8
60
3.4
47
4
38
Ø3
Ø5
Ø8
Ø10
Ø12
Ø14
Ø15
Ø16
Ø18
Ø19
Ø20
5
182
7.7
110
9.5
86
11.1
70
12.7
59
13.5
54
15
20
25
35
Al-H
Al-H
Al-H
Al-H
M6
M6
M8
M10
10
10
25
49
Transmittable friction torque TR of clamping hub [Nm]
Surface pressure [N/mm2]
23
139
27
114
31
96
33
89
35
83
39
72
40
68
42
64
Ø24
Ø25
28
141
32
119
34
110
36
102
40
90
42
84
44
80
52
65
53
62
Ø28
Ø30
Ø32
Ø35
Ø38
Ø40
Ø42
Ø45
Ø48
Ø50
Ø55
65
148
69
138
77
121
81
114
84
108
99
88
103
84
113
74
120
68
127
63
137
57
129
151
135
143
159
116
165
111
182
98
194
91
205
84
221
76
237
69
247
65
258
62
42
Steel
M10
69
237
172
246
164
272
145
289
134
306
125
331
113
335
103
371
97
387
91
411
84
433
78
449
75
486
67
Clamping hubs without feather keyway may be used in category 3 only and are marked with
category 3 accordingly.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
7 of 37
11
Technical data
1.2 Coupling dimensions
RADEX®-NC HT (hub type 2.5/2.6)
Illustration 4:
RADEX®-NC HT
type DK
Illustration 5:
RADEX®-NC HT
type EK
Table 4: Dimensions - RADEX®-NC HT (hub type 2.5/2.6)
Clamping screws
DIN EN ISO 4762
Dimensions [mm]
Size
16
21
26
36
Max. finish
bore D
20
30
38
45
DH
DK
L1, L2
46
58
69
84
48.9
59.2
73.4
86.8
22
25
32
35
L
DK
58.0
68.0
87.0
93.6
EK
47.0
53.5
69.0
74.8
DBSE
DI1
E
T
M
TA [Nm]
14.0
19.0
24.0
23.6
19.5
24.0
30.0
48.0
3.0
3.5
5.0
4.8
6.8
6.8
9.0
10.5
M6
M6
M8
M10
10
10
25
49
Table 5: Technical data - RADEX®-NC HT (hub type 2.5/2.6)
Size
16
21
26
36
TKN
[Nm]
35
70
120
340
TK max
[Nm]
53
105
180
510
Max. speed
[rpm]
10,500
8,500
7,000
5,700
Torsional stiffness [Nm/rad]
DK
EK
10,000
20,000
20,000
40,000
42,000
84,000
140,000
280,000
Mass moment of inertia [kgm2]
DK
EK
0.000063
0.00005
0.000180
0.00014
0.000460
0.00036
0.001100
0.00091
RADEX®-NC HT couplings with attachments that can generate heat, sparks and static
charging (e. g. combinations with brake drums, brake disks, overload systems such as
torque limiters, fan impellers etc.) are not permitted for the use in potentially explosive
atmospheres. A separate analysis must be performed.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
8 of 37
11
Technical data
1.2 Coupling dimensions
RADEX®-NC HT (hub type 3.5/3.6)
Illustration 6:
RADEX®-NC HT
type DK
Illustration 7:
RADEX®-NC HT
type EK
Table 6: Dimensions - RADEX®-NC HT (hub type 3.5/3.6)
Clamping screws
DIN EN ISO 4762
Dimensions [mm]
Size
43
51
61
75
Max. finish
bore D
55
70
80
90
DH
DK
L1, L2
104
124
144
170
104.0
129.7
148.5
181.1
40.5
50.0
54.0
70.0
L
DK
115
138
150
189
EK
89
108
118
152
DBSE
DI1
E
T
M
TA [Nm]
34
38
42
49
61
73
88
104
8
8
10
12
10.5
14.0
16.0
21.5
M10
M14
M16
M20
49
135
210
610
Table 7: Technical data - RADEX®-NC HT (hub type 3.5/3.6)
Size
43
51
61
75
TKN
[Nm]
600
1,300
2,000
3,200
TK max
[Nm]
900
1,950
3,000
4,800
Max. speed
[rpm]
8,100
6,700
6,100
5,100
Torsional stiffness [Nm/rad]
DK
EK
255,000
510,000
460,000
920,000
750,000
1,500,000
1,050,000
2,100,000
Mass moment of inertia [kgm2]
DK
EK
0.0033
0.0025
0.0082
0.0060
0.0160
0.0120
0.0990
0.0770
RADEX®-NC HT couplings with attachments that can generate heat, sparks and static
charging (e. g. combinations with brake drums, brake disks, overload systems such as
torque limiters, fan impellers etc.) are not permitted for the use in potentially explosive
atmospheres. A separate analysis must be performed.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
9 of 37
11
Technical data
1.2 Coupling dimensions
Table 8: Friction torques and surface pressure of RADEX®-NC HT clamping hubs
Size
16
Al-H
M6
10
Material - hub
Clamping screw M
Tightening torque TA [Nm]
Bore Ø
23
151
27
123
31
104
33
96
35
89
39
78
41
73
43
69
Ø10
Ø12
Ø14
Ø15
Ø16
Ø18
Ø19
Ø20
Ø22
Ø24
Ø25
Ø28
Ø30
Ø32
Ø35
Ø38
Hub type 2.5
Hub type 3.5
21
26
36
43
51
61
Al-H
Al-H
Al-H
Al-H
Al-H
Al-H
M6
M8
M10
M10
M14
M16
10
25
49
49
135
210
Transmittable friction torque TR of clamping hub [Nm]
Surface pressure [N/mm2]
28
131
32
111
34
103
36
96
40
84
42
79
44
74
48
67
52
60
54
58
59
51
63
47
66
144
70
134
77
118
81
111
85
105
92
94
100
85
103
81
114
72
121
66
127
61
137
55
147
50
Ø40
Ø42
Ø45
Ø48
Ø50
Ø55
129
153
135
145
147
130
159
118
165
113
182
99
194
92
205
85
221
77
237
70
247
66
258
62
273
58
218
114
238
104
248
100
278
89
297
83
317
78
347
72
377
66
397
63
416
60
446
56
476
52
496
50
545
46
Ø58
Ø60
Ø65
Ø70
495
150
554
134
594
125
633
117
693
107
752
99
792
94
831
89
891
83
950
78
990
75
1089
68
1148
65
1188
63
1286
58
1385
54
1230
102
1312
96
1367
92
1503
84
1585
79
1640
77
1777
71
1913
66
75
Steel
M20
610
3129
154
3442
140
3630
133
3755
129
4068
119
4381
110
Clamping hubs without feather keyway may be used in category 3 only and are marked with
category 3 accordingly.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
10 of 37
11
Technical data
1.2 Coupling dimensions
Table 8 continued: Friction torques and surface pressure of RADEX®-NC HT clamping hubs
Size
16
Al-H
M6
10
Material - hub
Clamping screw M
Tightening torque TA [Nm]
Bore Ø
Ø75
Ø80
Hub type 2.5
Hub type 3.5
21
26
36
43
51
61
Al-H
Al-H
Al-H
Al-H
Al-H
Al-H
M6
M8
M10
M10
M14
M16
10
25
49
49
135
210
Transmittable friction torque TR of clamping hub [Nm]
Surface pressure [N/mm2]
2050
61
2187
58
Ø85
Ø90
75
Steel
M20
610
4694
103
5006
97
5319
91
5632
86
Clamping hubs without feather keyway may be used in category 3 only and are marked with
category 3 accordingly.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
11 of 37
11
Technical data
1.2 Coupling dimensions
RADEX®-NC HT clamping ring hubs (hub type 6.5)
Illustration 8:
RADEX®-NC HT
clamping ring hub
type DK
Illustration 9:
RADEX®-NC HT
clamping ring hub
type EK
Table 9: Dimensions - RADEX®-NC clamping ring hubs (hub type 6.5)
Clamping screws
DIN EN ISO 4017
Dimensions [mm]
Size
16
21
26
36
43
51
61
Max. finish
bore D
20
28
35
42
60
70
80
DH
L1, L2
L3
46
58
69
84
104
124
144
24
28
36
43
46
50
55
18
22
28
35
35
38
43
L
DK
62.0
75.0
96.0
109.6
126.0
138.0
152.0
LG
EK
51.0
59.5
77.0
90.8
100.0
108.0
120.0
DK
68.0
81.2
100.8
118.3
135.9
150.5
165.5
EK
57.0
65.7
81.8
99.5
109.9
120.5
133.5
DBSE
DI1
E
M
TA [Nm]
14.0
19.0
24.0
23.6
34.0
38.0
42.0
19.5
24.0
30.0
48.0
61.0
73.0
88.0
3.0
3.5
5.0
4.8
8.0
8.0
10.0
M5
M6
M5
M8
M8
M10
M12
6
10
6
25
25
49
85
Table 10: Technical data - RADEX®-NC clamping ring hubs (hub type 6.5)
Size
16
21
26
36
43
51
61
TKN
[Nm]
35
70
120
340
600
1,300
2,000
Please observe protection
note ISO 16016.
TK max
[Nm]
53
105
180
510
900
1,950
3,000
Drawn:
Verified:
Max. speed
[rpm]
31,150
24,700
20,800
17,100
13,800
11,600
10,000
Torsional stiffness [Nm/rad]
DK
EK
10,000
20,000
20,000
40,000
31,500
63,000
125,000
250,000
155,000
310,000
600,000
1,200,000
775,000
1,550,000
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
Mass moment of inertia [kgm2]
DK
EK
0.000075
0.000063
0.000218
0.000177
0.000565
0.000467
0.001581
0.001294
0.004051
0.003250
0.008981
0.007096
0.024188
0.020678
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
1
KTR-N
Sheet:
Edition:
47210 EN
12 of 37
11
Technical data
1.2 Coupling dimensions
Table 11: Friction torques and surface pressure of RADEX®-NC HT clamping ring hubs
Size
Material - hub and
clamping ring
Clamping screw M
Number z (for each
clamping ring hub)
Tightening torque TA
[Nm]
16
21
26
36
43
51
61
Al-H
Al-H
Al-H
Al-H
Al-H
Al-H
Al-H
M5
M6
M5
M8
M8
M10
M12
4
4
8
6
6
6
6
6
10
6
25
25
49
85
2
Bore Ø
Ø10
Ø12
Ø15
Ø16
Ø19
Ø20
Ø24
Ø25
Ø28
Ø30
Ø32
Ø35
Ø38
Ø40
Ø42
Ø45
Ø48
Ø50
Ø55
Ø60
Ø65
Ø70
Ø75
Ø80
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
H7/h6
H7/k6
G7/h6
G7/m6
G7/h6
G7/m6
G7/h6
G7/m6
G7/h6
G7/m6
G7/h6
G7/m6
G7/h6
G7/m6
Nm
29
34
33
42
70
76
50
62
83
96
97
109
N/mm2
162
183
149
173
146
156
120
139
119
131
118
127
Transmittable friction torque TR of clamping ring hub [Nm] / surface pressure [N/mm ]
Nm
N/mm2 Nm
N/mm2 Nm
N/mm2 Nm
N/mm2 Nm
N/mm2
27
165
36
197
45
165
56
190
91
161
104
171
99
172
124
193
79
148
126
170
93
166
145
189
125
145
194
166
139
158
214
180
145
144
169
151
241
161
157
153
200
171
284
181
127
118
279
148
395
157
169
129
305
159
430
169
144
117
311
147
438
156
187
126
334
156
471
166
201
115
338
134
521
147
595
168
245
119
382
142
558
156
684
177
404
132
616
145
705
166
750
171
444
138
646
151
789
172
822
182
273
112
523
132
647
159
818
169
355
122
640
142
784
169
927
180
357
110
664
130
814
156
1020
166
441
116
779
136
961
162
1117
173
647
113
946
146
1085
160
778
120
1096
153
1254
167
741
112
1073
144
1228
158
875
118
1219
150
1392
164
841
111
980
133
1166
151
974
115
1144
140
1348
158
1163
131
1377
149
1332
136
1568
154
1360
129
1605
146
1564
132
1803
149
1200
114
1450
136
1376
119
1652
141
1072
96
1607
131
1370
103
1960
136
1372
95
2283
118
1669
99
2387
123
2255
103
2447
109
2704
102
2842
105
The transmittable friction torques of the clamping connection consider the
max. clearance with shaft tolerance h6 resp. k6/bore H7, from Ø55 G7/m6
resp. G7/h6. The friction torque is reduced with bigger clearance (see
chapter 4.5).
The surface pressure of the clamping connection specified considers the
minimum clearance with shaft fit k6/bore H7, from Ø55 G7/m6.
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Nm
N/mm2
880
951
1074
1131
1211
1258
1264
1333
1480
1534
1597
1668
1750
1810
1911
2032
2097
2239
2542
2635
2669
2785
2718
2855
3168
3252
128
137
126
132
124
128
121
127
119
123
115
120
114
117
105
111
97
103
96
99
88
91
79
83
78
80
A calculation of the hollow shaft
strength is necessary if hollow
shafts are used (see chapter 4.6)!
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Advice
2.1 General advice
Please read through these operating/assembly instructions carefully before you start up the coupling.
Please pay special attention to the safety instructions!
The RADEX®-NC and RADEX®-NC HT coupling is suitable and approved for the use in potentially
explosive atmospheres. When using the coupling in potentially explosive atmospheres, observe the
special advice and instructions regarding safety in enclosure A.
The operating/assembly instructions are part of your product. Please store them carefully and close to the
coupling. The copyright for these operating/assembly instructions remains with KTR.
2.2 Safety and advice symbols
STOP
!

Warning of potentially explosive
atmospheres
This symbol indicates notes which may contribute to
preventing bodily injuries or serious bodily injuries that
may result in death caused by explosion.
Warning of personal injury
This symbol indicates notes which may contribute to
preventing bodily injuries or serious bodily injuries that
may result in death.
Warning of product damages
This symbol indicates notes which may contribute to
preventing material or machine damage.
General advice
This symbol indicates notes which may contribute to
preventing adverse results or conditions.
Warning of hot surfaces
This symbol indicates notes which may contribute to
preventing burns with hot surfaces resulting in light to
serious bodily injuries.
2.3 General hazard warnings
STOP
With assembly, operation and maintenance of the coupling it has to be made sure that the
entire drive train is secured against accidental switch-on. You may be seriously hurt by
rotating parts. Make absolutely sure to read through and observe the following safety
indications.
• All operations on and with the coupling have to be performed taking into account "safety first".
• Make sure to switch off the power pack before you perform your work on the coupling.
• Secure the power pack against accidental switch-on, e. g. by providing warning signs at the place of switch-on
or removing the fuse for current supply.
• Do not reach into the operating area of the coupling as long as it is in operation.
• Secure the coupling against accidental contact. Provide for the necessary protection devices and covers.
Please observe protection
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Advice
2.4 Intended use
You may only assemble, operate and maintain the coupling if you
• have carefully read through the operating/assembly instructions and understood them
• are technically qualified and specifically trained (e. g. safety, environment, logistics)
• are authorized by your company
The coupling may only be used in accordance with the technical data (see chapter 1). Unauthorized modifications
on the coupling design are not admissible. We will not assume liability for any damage that may arise. In the
interest of further development we reserve the right for technical modifications.
The RADEX®-NC and RADEX®-NC HT described in here corresponds to the state of the art at the time of printing
of these operating/assembly instructions.
2.5 Coupling selection
!
For a permanent and failure-free operation of the coupling it must be selected according to
the selection instructions (according to DIN 740 part 2) for the particular application (see
catalogue drive technology "RADEX®-NC").
If the operating conditions (performance, speed, modifications on engine and machine)
change, the coupling selection must be reviewed.
Make sure that the technical data regarding torque refer to the laminae set only. The
transmittable torque of the shaft-hub-connection must be reviewed by the customer and is
subject to his responsibility.
For drives subject to torsional vibrations (drives with cyclic stress due to torsional vibrations) it is necessary to
perform a torsional vibration calculation to ensure a reliable selection. Typical drives subject to torsional vibrations
are e. g. drives with diesel engines, piston pumps, piston compressors etc. If requested, KTR will perform the
coupling selection and the torsional vibration calculation.
2.6 Reference to EC Machinery Directive 2006/42/EC
The couplings supplied by KTR should be considered as components, not machines or partly completed
machines according to EC Machinery Directive 2006/42/EC. Consequently KTR does not have to issue a
declaration of incorporation. For details about safe assembly, start-up and safe operation refer to the present
operating/assembly instructions considering the warnings.
Please observe protection
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Storage, transport and packaging
3.1 Storage
The coupling hubs are supplied in preserved condition and can be stored in a dry and roofed place for 6 - 9
months.
!
The storage rooms must not include any ozone-generating devices like e. g. fluorescent
light sources, mercury-vapour lamps or electrical high-voltage appliances.
Humid storage rooms are not suitable.
Make sure that condensation is not generated. The best relative air humidity is less than
65 %.
3.2 Transport and packaging
!
In order to avoid any injuries and any kind of damage always make use of proper transport
and lifting equipment.
The couplings are packed differently each depending on size, number and kind of transport. Unless otherwise
contractually agreed, packaging will follow the in-house packaging specifications of KTR.
Please observe protection
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Assembly
Generally the coupling is supplied in mounted condition. Before assembly the coupling has to be inspected for
completeness.
4.1 Components of the couplings
Components of RADEX®-NC type DK
Component
1
2
3
4
5
Quantity
2
2
1
see table 12
2
Component assembly
Clamping hub
Laminae set (cylindrical sleeve type)
Spacer
Cap screw DIN EN ISO 4762
Cap screw DIN EN ISO 4762
Illustration 10: RADEX®-NC type DK (example: hub type 2.5)
Components of RADEX®-NC type EK
Component
1
2
4
5
Quantity
2
1
see table 12
2
Component assembly
Clamping hub
Laminae set (cylindrical sleeve type)
Cap screw DIN EN ISO 4762
Cap screw DIN EN ISO 4762
Illustration 11: RADEX®-NC type EK (example: hub type 2.5)
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Assembly
4.1 Components of the couplings
Components of RADEX®-NC HT type DK
Component
1
2
3
4
5
Quantity
2
2
1
see table 13
2
Component assembly
Clamping hub
Laminae set (taper sleeve type)
Spacer
Cap screw DIN EN ISO 4762
Cap screw DIN EN ISO 4762
Illustration 12: RADEX®-NC HT type DK (example: hub type 2.5)
Components of RADEX®-NC HT type EK
Component
1
2
4
5
Quantity
2
1
see table 13
2
Component assembly
Clamping hub
Laminae set (taper sleeve type)
Cap screw DIN EN ISO 4762
Cap screw DIN EN ISO 4762
Illustration 13: RADEX®-NC HT type EK (example: hub type 2.5)
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Assembly
4.1 Components of the couplings
Components of RADEX®-NC HT clamping ring hub type DK
Component
1.1
1.2
2
3
4
6
Quantity
2
2
2
1
see table 13
see table 11
Component assembly
Clamping ring hub
Clamping ring
Laminae set (taper sleeve type)
Spacer
Cap screw DIN EN ISO 4762
Hexagon screw DIN EN ISO 4017
Illustration 14: RADEX®-NC HT clamping ring hub type DK (hub type 6.5)
Components of RADEX®-NC HT clamping ring hub type EK
Component
1.1
1.2
2
4
6
Quantity
2
2
1
see table 13
see table 11
Component assembly
Clamping ring hub
Clamping ring
Laminae set (taper sleeve type)
Cap screw DIN EN ISO 4762
Hexagon screw DIN EN ISO 4017
Illustration 15: RADEX®-NC HT clamping ring hub type EK (hub type 6.5)
Please observe protection
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Assembly
4.2 Advice for finish bore
STOP
The maximum permissible bore diameters D (see
chapter 1 - technical data) must not be exceeded. If
these figures are disregarded, the coupling may tear.
Rotating particles may cause danger to life.
• Hub bores machined by the customer have to observe
concentricity resp. axial runout (see illustration 16).
• Make absolutely sure to observe the figures for ØD.
• Carefully align the clamping hubs or clamping ring hubs
when the finish bores are drilled.
Illustration 16: Concentricity and axial runout
!
The customer bears the sole responsibility for all machining processes performed
subsequently on unbored or pilot bored as well as finish machined coupling components
and spare parts. KTR does not assume any warranty claims resulting from insufficient
remachining.
KTR supplies unbored or pilot bored coupling components and spare parts only upon
explicit request of the customer. These parts are additionally marked with the symbol
.
Reference to unbored resp. pilot bored coupling components with explosion protection
marking:
Basically the company KTR Systems GmbH supplies couplings resp. coupling hubs with explosion
protection marking as an unbored or pilot bored type only on explicit request of the customer. The
prerequisite is a declaration of exemption submitted by the customer assuming any responsibility
and liability for respective remachining performed on the product of KTR Systems GmbH.
4.3 Assembly of the hubs (general)

We recommend to inspect bores, shaft, keyway and feather key for dimensional accuracy
before assembly.
Pay attention to the ignition risk in potentially explosive atmospheres!
!
With the assembly make sure that the dimension DBSE resp. dimension E (see chapter 1.2)
is observed so that the coupling components are not in contact with each other during the
operation.
Disregarding this advice may cause damage to the coupling.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
Please observe protection
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Assembly
4.4 Assembly of clamping hubs (hub type 2.5, 2.6, 3.5 and 3.6)
The power transmission of the coupling is made frictionally engaged via clamping hubs.
• Clean and degrease hub bores and shafts.
• Lightly unscrew the clamping screws (component 5) (see illustration 17).
• Push the shaft ends of driving and driven side into the clamping hubs of
the coupling. Please observe dimension L1 or L2 (see chapter 1.2).
• Shift the power packs in axial direction until the distance dimension
DBSE or E is achieved. If the power packs are already firmly assembled,
shifting the clamping hubs axially on the shafts allows for adjusting the
distance dimension DBSE resp. E.
!
With the assembly make sure that the dimension DBSE
resp. E (see chapter 1.2) is observed so that the coupling
is installed free from distortion in axial direction.
Disregarding this advice may cause damage to the
coupling.
Illustration 17: Assembly of clamping hub
• Tighten the clamping screws (component 5) at the tightening torque specified in table 1, 4 resp. 6.
With hub types 3.5 resp. 3.6 the clamping screws have to be tightened alternately in equal steps at the
tightening torques specified in table 6.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
!
The transmittable friction torques of the clamping hubs depend on the bore diameter (see
table 3 resp. 8).
Clamping hubs without feather keyway may be used in category 3 only and are marked with
category 3 accordingly.
!
If the clamping screws are not tightened at the correct tightening torque, there is the risk of
a) a fracture of the hub and plastic deformation with a too high tightening torque T A
b) early slippling, untightening of the screws with a too low tightening torque T A
Please observe protection
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Assembly
4.5 Assembly of clamping ring hubs (hub type 6.5)
The power transmission of the clamping hubs is made frictionally engaged. The necessary surface pressure is
transmitted via the clamping ring with internal taper to the taper hub and consequently to the shaft. The friction
torques specified in table 11 consider a fit pair H7/h6 resp. H7/k6, from Ø55 G7/h6 resp. G7/k6. With a bigger fit
clearance the friction torques specified in table 11 decrease.
The strength and dimensions of the shafts (specifically hollow shafts) have to be defined such that sufficient
safety against plastic deformation is ensured. For a detailed calculation please contact KTR.
• Clean the hub bores and the shafts and inspect for dimensional accuracy,
afterwards lubricate with a thin oil (e. g. Castrol 4 in 1, Klüber Quietsch-Ex
or WD-40).
!
Oils and greases containing molybdenum disulfide or other
high-pressure additives as well as internal lubricants must
not be used.
• Lightly untighten the clamping screw (component 6) and pull the clamping
ring (component 1.2) from the hub only marginally to make sure that the
clamping ring fits loosely (see illustration 18).
• Push the shaft ends of driving and driven side into the clamping ring hubs
(component 1.1) of the coupling. Dimension L3 should be observed at the
minimum (see table 9).
• Tighten the clamping screws (component 6) evenly gradually and
crosswise at 1/3 resp. 2/3 the tightening torque TA (see table 9) until the
clamping ring gets in contact. Afterwards tighten the clamping screws at
the tightening torque specified in table 9 one after another.
!
Illustration 18: Assembly of clamping
ring hub with clamping ring
If the clamping screws are not tightened at the correct tightening torque, there is the risk of
a) a fracture of the hub and plastic deformation with a too high tightening torque T A
b) early slippling, untightening of the screws with a too low tightening torque T A
4.6 Disassembly of clamping ring hubs (hub type 6.5)
Unscrew the clamping screws evenly one after another. During each
revolution every screw may only be unscrewed by half a turn. Unscrew all
clamping screws by 3 - 4 pitches.
Unscrew the setscrews bonded in the extraction threads and screw in further
until contact.
The clamping ring is released by tightening the setscrews in the extraction
threads evenly gradually and crosswise.
!
If these hints are not observed, the operation of the
coupling may be affected.
Illustration 19: Disassembly of clamping
ring hub with clamping ring
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Assembly
4.6 Disassembly of clamping ring hubs (hub type 6.5)
!

Oils and greases containing molybdenum disulfide or other high-pressure additives as well
as internal lubricants must not be used.
With reassembly the taper surfaces, bores of the hub and the shaft have to be cleaned. The
bore of the hub and shaft have to be lubricated with thin oil (e. g. Castrol 4 in 1, Klüber
Quietsch-Ex or WD-40). Lightly paint the taper surfaces of the clamping ring hub or
clamping ring with the grease Gleitmo 800, afterwards twist the components against one
another by one revolution in order to spread the grease evenly.
All setscrews must be completely unscrewed. Afterwards apply Loctite (medium strength)
on the setscrews and screw in flush with the front face of the clamping ring.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
4.7 Assembly of laminae sets
!
With the assembly make sure that the laminae sets are installed free from distortion in axial
direction. Disregarding this advice may cause damage to the coupling.
• Clean and degrease the contact surfaces of screw connections on the hubs, laminae set and spacer.
• Insert the laminae set in the hub resp. spacer as shown in illustration 21 resp. 23.
• Applies with RADEX®-NC HT only:
The laminae set always has to be aligned such that the taper sleeve is inserted in the taper indentation of the
hub resp. spacer (see illustration 22).

Make absolutely sure that the laminae sets are mounted as shown in illustration 21 or 23.
• Hand-tighten the laminae set first. Afterwards tighten the cap screws gradually and crosswise to the tightening
torque specified in table 12 resp. 13. Repeat this process until all screws have achieved the full tightening
torque (see table 12 resp. 13).
Please observe protection
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Assembly
4.7 Assembly of laminae sets
Illustration 20: Assembly of RADEX®-NC (cylindrical type of sleeve)
Illustration 21: Assembly of laminae sets (cylindrical sleeves)
Illustration 22: Assembly of RADEX®-NC HT (taper type of sleeve)
Illustration 23: Assembly of laminae sets (taper sleeves)
Table 12: Tightening torques of the screws - Laminae set RADEX®-NC
Size
Number of screws 1)
Screw size
Tightening torque TA [Nm]
5
4
M2.5
1.1
10
4
M3
1.9
15
4
M4
4.1
20
4
M5
8.5
25
4
M6
14
35
4
M6
14
42
4
M8
35
1) Number of screws per laminae set. With type DK two laminae sets are mounted (number of screws doubled).
Table 13: Tightening torques of screws - Laminae set RADEX®-NC HT
Size
Number of screws 1)
Screw size
Tightening torque TA [Nm]
16
4
M4
4.1
21
4
M5
8.5
26
4
M6
14
36
6
M6
14
43
6
M8
35
51
6
M10
69
61
6
M10
69
75
6
M12
120
1) Number of screws per laminae set. With type DK two laminae sets are mounted (number of screws doubled).
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Assembly
4.8 Displacements - alignment of the couplings
The displacement figures specified in table 14 and 15 provide for sufficient safety to compensate for external
influences like, for example, thermal expansion or foundation settling.
In order to ensure a long service life of the coupling and avoid hazards with the use in
potentially explosive atmospheres, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures specified (see tables 14 and 15).
If the figures are exceeded, the coupling will be damaged.
The more accurate the alignment of the coupling, the longer is its service life.
If used in potentially explosive atmospheres for explosion group IIC, only half of the
displacement figures (see tables 14 and 15) is permissible.
!
Please note:
• The displacement figures specified in table 14 and 15 are maximum figures which must not arise in parallel. If
radial and angular displacements arise simultaneously, the permissible displacement figures may only be used
proportionally (see illustration 25).
• Inspect with a dial gauge, ruler or feeler whether the permissible displacement figures of tables 14 and 15 can
be observed.
Axial displacements
Radial displacements
Angular displacements
Illustration 24: Displacements
Examples of the displacement
combinations specified in illustration 25:
Illustration 25:
Combinations of
displacement
Example 1:
Kr = 30 %
Kw = 70 %
Example 2:
Kr = 60 %
Kw = 40 %
Ktotal = Kr + Kw  100 %
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Assembly
4.8 Displacements - alignment of the couplings
Table 14: Displacement figures - RADEX®-NC
Size
5
10
15
20
25
35
42
Max. axial
displacement Ka
[mm]
0.4
0.8
1.0
1.2
1.6
2.0
2.8
Type DK
Max. radial
displacement Kr
[mm]
0.13
0.16
0.17
0.26
0.33
0.36
0.43
Max. angular
displacement Kw 1)
[degree]
1
1
1
1
1
1
1
Max. axial
displacement Ka
[mm]
0.2
0.4
0.5
0.6
0.8
1.0
1.4
Type EK
Max. radial
displacement Kr
[mm]
-
Max. angular
displacement Kw 1)
[degree]
1
1
1
1
1
1
1
Max. axial
displacement Ka
[mm]
0.50
0.60
0.80
1.00
1.10
1.25
1.30
1.45
Type EK
Max. radial
displacement Kr
[mm]
-
Max. angular
displacement Kw 1)
[degree]
1
1
1
1
1
1
1
1
1) each laminae set
Table 15: Displacement figures - RADEX®-NC HT
Size
16
21
26
36
43
51
61
75
Max. axial
displacement Ka
[mm]
1.0
1.2
1.6
2.0
2.2
2.5
2.6
2.9
Type DK
Max. radial
displacement Kr
[mm]
0.19
0.27
0.33
0.32
0.45
0.52
0.62
0.64
Max. angular
displacement Kw 1)
[degree]
1
1
1
1
1
1
1
1
1) each laminae set
5
Start-up
Before start-up of the coupling, inspect the alignment and the distance dimension DBSE or E and adjust, if
necessary, and also inspect all screw connections for the tightening torques specified.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
Finally the coupling protection against accidental contact must be fitted. It is required in accordance with
DIN EN ISO 12100 (Safety of Machinery) and directives 2014/34/EU and SI 2016 No. 1107 and must protect
against
• access with the little finger
• falling down of solid foreign objects.
The coupling protection is not part of KTR's scope of delivery and is the customer's responsibility. It must have
sufficient distance to the rotating components to avoid contact safely. Depending on the outside diameter DH of
the coupling, we recommend the following minimum distance:
ØDH to 50 mm = 6 mm, ØDH 50 mm to 120 mm = 10 mm, ØDH from 120 mm = 15 mm.
Please check if a proper enclosure (ignition protection, coupling protection, contact protection) has been mounted
and the operation of the coupling is not affected by the enclosure. The same applies for test runs and rotational
direction inspections.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
5
KTR-N
Sheet:
Edition:
47210 EN
26 of 37
11
Start-up
The cover may provide for openings intended for necessary heat dissipation. These openings have to comply with
DIN EN ISO 13857.
The cover must be electrically conductive and included in the equipotential bonding. Bellhousings (magnesium
share below 7.5 %) made of aluminium and damping rings (NBR) can be used as connecting element between
pump and electric motor. The cover may only be taken off with standstill of the unit.
If the couplings are used in locations subject to dust explosion and in mining the user must
make sure that there is no accumulation of dust in a dangerous volume between the cover
and the coupling. The coupling must not operate in an accumulation of dust.
For covers with unlocked openings on the top face no light metals must be used if the
couplings are used as equipment of equipment group ll (if possible, from stainless steel).
If the couplings are used in mining (equipment group l M2), the cover must not be made of
light metal. In addition, it must be resistant to higher mechanical loads than with use as
equipment of equipment group ll.
During operation of the coupling, please pay attention to
• different operating noise
• vibrations occurring.
!
If you note any irregularities with the coupling during operation, the drive unit must be
switched off immediately. The cause of the breakdown must be specified by means of the
table „Breakdowns“ and, if possible, be eliminated according to the proposals. The potential
breakdowns specified can be hints only. To find out the cause all operating factors and
machine components must be considered.
Coating of coupling:
If coated (priming, paintings, etc.) couplings are used in potentially explosive atmospheres,
the requirements on conductibility and coating thickness must be considered. With
paintings up to 200 µm electrostatic load does not have to be expected. If thicker paintings
resp. coatings up to a layer thickness of a maximum of 2.0 mm are applied, the couplings
are not permissible for gases and vapours of category IIC in potentially explosive areas, but
only for gases and vapours of category IIA and IIB.
This also applies for multiple coatings exceeding an overall thickness of 200 µm. Make sure
with painting or coating that the coupling components are conductively connected with the
device/devices to be connected so that the equipotential bonding is not impeded by the
paint or coat applied. Basically painting of the laminae set is not admitted to ensure an
equipotential bonding.
In addition, make sure that the marking of the coupling remains legible.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
6
KTR-N
Sheet:
Edition:
47210 EN
27 of 37
11
Breakdowns, causes and elimination
The below-mentioned failures can result in improper use of the RADEX®-NC and RADEX®-NC HT coupling. In
addition to the specifications given in these operating/assembly instructions make sure to avoid such failures.
The errors listed can only be clues to search for the failures. When searching for the failure the adjacent
components must generally be considered.
The coupling can become a source of ignition with improper use.
Directive 2014/34/EU and UK directive SI 2016 No. 1107 require special care by the
manufacturer and the user.
General failures with improper use:
•
•
•
•
•
•
•
•
•
•
Important data for the coupling selection are not forwarded.
The calculation of the shaft-hub-connection is not considered.
Coupling components with damage occurred during transport are assembled.
If the heated hubs are assembled, the permissible temperature is exceeded.
The clearance of the components to be assembled is not coordinated with one another.
Tightening torques have been fallen below/exceeded.
Components are mixed up by mistake/assembled incorrectly.
A wrong or no laminae set is inserted in the coupling.
No original KTR components (purchased parts) are used.
Maintenance intervals are not observed.
Breakdowns
Different operating
noise and/or
vibrations occuring
Fracture of steel
laminae set
Causes
Hazard notes for
potentially explosive
atmospheres
Misalignment
none
Dowel screws working
loose, low micro friction
under the screw head
and on the steel
laminae set
Danger of ignition due to
hot surfaces
Screws for axial
fastening of flange
hubs working loose
none
Fracture of steel
laminae set due to high
impact
energy/overload
Ignition risk due to
sparking
Operating parameters
do not meet with the
performance of the
coupling
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Elimination
1) Set the unit out of operation
2) Eliminate the reason for the misalignment
(e. g. loose foundation bolts, fracture of the
engine mount, thermal expansion of unit
components, modification of the installation
dimension E of the coupling)
3) For inspection of wear see chapter 10.2
1) Set the unit out of operation
2) Inspect coupling components and replace
coupling components that are damaged
3) Tighten the dowel screws to the tightening
torque specified
4) Inspect alignment, adjust if necessary
1) Set the unit out of operation
2) Inspect alignment of coupling
3) Tighten the screws to fasten the flange hubs
and secure against working loose
4) For inspection of wear see chapter 10.2
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the steel laminae sets
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert steel laminae sets, assemble coupling
components
5) Find out the reason for overload
1) Set the unit out of operation
2) Review the operating parameters and select
a bigger coupling (consider mounting space)
3) Assemble new coupling size
4) Inspect alignment
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
6
47210 EN
28 of 37
11
Breakdowns, causes and elimination
Breakdowns
Causes
Hazard notes for
potentially explosive
atmospheres
Fracture of steel
laminae set
Operating error of the
unit
Ignition risk due to
sparking
Cracks in / fracture of
the steel laminae set /
fastening screws
Vibrations of drive
Ignition risk due to
sparking
!
7
KTR-N
Sheet:
Edition:
Elimination
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the steel laminae sets
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert steel laminae sets, assemble coupling
components
5) Instruct and train the service staff
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the steel laminae sets
3) Inspect coupling components and replace
coupling components that are damaged
4) Insert steel laminae sets, assemble coupling
components
5) Inspect alignment, adjust if necessary
6) Find out the reason for vibrations
When operating with a faulty laminae set (see chapter 10.3) proper operation is not assured.
Disposal
In respect of environmental protection we would ask you to dispose of the packaging resp. products on
termination of their service life in accordance with the legal regulations resp. standards that apply.
•
Metal
Any metal components have to be cleaned and disposed of by scrap metal.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
8
KTR-N
Sheet:
Edition:
47210 EN
29 of 37
11
Maintenance and service
Monitoring of the general condition of the coupling can be done both at standstill and during operation. If the
coupling is tested during operation, the operator must ensure an appropriate and proven test procedure (e. g.
stroboscopic lamp, high-speed camera, etc.) which is definitely comparable to testing at standstill. If any
distinctive features occur, an inspection must be made with the machine stopped.
RADEX®-NC and RADEX®-NC HT is a low-maintenance coupling. We recommend to perform a visual inspection
on the coupling at least once a year. Pay special attention to the condition of the laminae sets, alignment and
screw connection of the coupling.
• Since the flexible machine bearings of the driving and driven side settle during the course of load, inspect the
alignment of the coupling and re-align the coupling, if necessary.
• If some individual laminas are broken, the laminae sets of the coupling have to be replaced. The coupling
components have to be inspected for damages.
• The screw connections have to be inspected visually.
With the use in potentially explosive atmospheres observe chapter 10.2 "Inspection
intervals for couplings in
potentially explosive atmospheres".
9
Spares inventory, customer service addresses
We recommend to store major spare parts on site to ensure the readiness for use of the machine in case if a
coupling fails.
Contact addresses of the KTR partners for spare parts and orders can be obtained from the KTR homepage at
www.ktr.com.

KTR does not assume any liability or warranty for the use of spare parts and accessories
which are not provided by KTR and for the damages which may incur as a result.
KTR Systems GmbH
Carl-Zeiss-Str. 25
D-48432 Rheine
Phone: +49 5971 798-0
E-mail: [email protected]
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
30 of 37
11
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
Applicable hub designs/types:
a) Hubs that may be used in group II, category 2 and 3:
(hubs with feather keyway and clamping ring hubs)
• 2.6 Clamping hub double slot with feather keyway
• 3.6 Clamping hub triple slot with feather keyway
• 6.5 Clamping ring hub
• Type DK and EK with hubs corresponding to the aforementioned details
b) Hubs which may be used in group II, category 3 only:
(hubs without feather keyway)
• 2.5 Clamping hub double slot without feather keyway
• 3.5 Clamping hub triple slot without feather keyway
• Type DK and EK with hubs corresponding to the aforementioned details
Hubs, clamping hubs or similar types without feather keyway may be used in category 3
only and are marked with category 3 accordingly.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
31 of 37
11
Enclosure A
Advice and instructions regarding the use in
10.1 Intended use in
potentially explosive atmospheres
potentially explosive atmospheres
Conditions of operation in
potentially explosive atmospheres
The RADEX®-NC and RADEX®-NC HT couplings are suitable for the use according to directives 2014/34/EU and
SI 2016 No. 1107.
• Protection against hazards arising from lightning must follow the lightning protection concept of the machine or
plant. The relevant regulations and policy for lightning protection must be observed.
• The equipotential bonding of the couplings is made by metal contact between coupling hub and shaft. This
equipotential bonding must not be affected.
1. Industry (with the exception of mining)
•
•
•
•
Equipment group II of category 2 and 3 (coupling is not approved/not suitable for equipment group 1)
Substance group G (gases, fogs, vapours), zone 1 and 2 (coupling is not approved/not suitable for zone 0)
Substance group D (dusts), zone 21 and 22 (coupling is not approved/not suitable for zone 20)
Explosion group IIC (gases, fogs, vapours) (explosion groups IIA and IIB are included in IIC) and
explosion group IIIC (dusts) (explosion groups IIIA and IIIB are included in IIIC)
Temperature class:
Temperature class
T3
T4
T5
T6
Ambient or operating temperature Ta 1)
-30 °C to +175 °C
-30 °C to +110 °C
-30 °C to +75 °C
-30 °C to +60 °C
Max. surface temperature 2)
+195 °C
+130 °C
+95 °C
+80 °C
Explanation:
The maximum surface temperatures each result from the maximum permissible ambient or operating temperature T a plus the maximum
temperature increase T of 20 K to be considered. For the temperature class a safety margin subject to standard of 5 K is added.
1) The ambient or operating temperature Ta is limited to +175 °C due to the permissible permanent operating temperature.
2) The maximum surface temperature of +195 °C applies for the use in locations which are potentially subject to dust explosion.
In potentially explosive atmospheres
• the ignition temperature of dusts generated must at least be 1.5 times the surface temperature to be
considered
• the glow temperature must at least be the surface temperature to be considered plus a safety distance of 75 K.
• the gases and vapours generated must amount to the temperature class specified.
2. Mining
Equipment group I of category M2 (coupling is not approved/not suitable for equipment group M1).
Permissible ambient temperature -30 °C to +130 °C.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
32 of 37
11
Enclosure A
Advice and instructions regarding the use in
10.2 Inspection intervals for couplings in
Equipment category
3G
3D
M2
2G
2D
No gases and vapours of
explosion group IIC
M2
2G
2D
Gases and vapours of
explosion group IIC
potentially explosive atmospheres
potentially explosive atmospheres
Inspection intervals
For couplings operated in zone 2 or zone 22 the inspection and maintenance intervals of the
usual operating/assembly instructions for standard operation apply. During the standard
operation which has to be taken as a basis of the ignition risk analysis the couplings are free
from any ignition source. For gases, vapours and dusts generated the permissible glow and
ignition temperatures specified in chapter 10.1 have to be considered and observed.
An inspection of the torsional backlash and a visual inspection of the laminae sets must be
performed after 3,000 operating hours for the first time, at the latest 6 months after start-up of
the coupling.
If you note insignificant or no wear on the lamina sets upon this initial inspection, further
inspections can each be performed after 6,000 operating hours or at the latest after 18
months, provided that the operating parameters remain the same.
If you note significant wear during the initial inspection so that it would be recommendable to
replace the laminae sets, find out the cause according to the table „Breakdowns“, if possible.
The maintenance intervals must be adjusted to the modified operating parameters without fail.
An inspection of the torsional backlash and a visual inspection of the laminae sets must be
performed after 2,000 operating hours for the first time, at the latest 3 months after start-up of
the coupling.
If you note insignificant or no wear on the lamina sets upon this initial inspection, further
inspections can each be performed after 4,000 operating hours or at the latest after 12
months, provided that the operating parameters remain the same.
If you note significant wear during the initial inspection so that it would be recommendable to
replace the laminae sets, find out the cause according to the table „Breakdowns“, if possible.
The maintenance intervals must be adjusted to the modified operating parameters without fail.
Hubs, clamping hubs or similar types without feather keyway may be used in category 3
only and are marked with category 3 accordingly.
RADEX®-NC coupling
Illustration 26: Example of RADEX®-NC type DK (hub type 2.5)
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
33 of 37
11
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
10.3 Visual inspection and measures
During the visual inspection the laminae sets must be inspected for cracks and cap screws working loose.
Cap screws working loose must be tightened at the screw tightening torque specified (see table 10).
Laminae sets and screws showing cracks must be replaced immediately, irrespective of the inspection intervals.
Monitoring of the general condition of the coupling can be done both at standstill and during operation. If the
coupling is tested during operation, the operator must ensure an appropriate and proven test procedure (e. g.
stroboscopic lamp, high-speed camera, etc.) which is definitely comparable to testing at standstill. If any
distinctive features occur, an inspection must be made with the machine stopped.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
Illustration 27: Example of RADEX®-NC type DK (hub type 2.5)
!
In order to ensure a long service life of the coupling and avoid hazards with the use in
potentially explosive atmospheres, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures specified (see table 11). If the figures
are exceeded, the coupling will be damaged. Faulty components have to be replaced.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
34 of 37
11
Enclosure A
Advice and instructions regarding the use in
10.4
potentially explosive atmospheres
marking of coupling for potentially explosive atmospheres
The explosion protection marking of the RADEX®-NC and RADEX®-NC HT coupling is applied on the outer
sheath or on the front side. The spacer is not marked.
For the complete marking refer to the operating/assembly instructions and/or the delivery note/package.
The following marking applies for the products:
• Type without aluminium, with feather keyway and/or clamping ring hub (Category 2)
I M2
II 2G
II 2D
Ex h
I
Mb
Ex h
IIC T6
… T3
Gb
Ex h
IIIC T80 °C … T195 °C Db
<Year>
-30 °C ≤ Ta ≤ +60 °C … +175 °C
KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine
X
X
X
-30 °C ≤ Ta ≤ +130 °C
• Type without aluminium, without feather keyway (Category 3)
I M2
II 3G
II 3D
Ex h
I
Mb
Ex h
IIC T6
… T3
Gc
Ex h
IIIC T80 °C … T195 °C Dc
<Year>
-30 °C ≤ Ta ≤ +60 °C … +175 °C
KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine
X
X
X
-30 °C ≤ Ta ≤ +130 °C
• Type with aluminium, with feather keyway and/or clamping ring hub (Category 2)
Ex h
IIC T6
… T3
Gb
Ex h
IIIC T80 °C … T195 °C Db
<Year>
-30 °C ≤ Ta ≤ +60 °C … +175 °C
KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine
II 2G
II 2D
X
X
• Type with aluminium, without feather keyway (Category 3)
Ex h
IIC T6
… T3
Gc
Ex h
IIIC T80 °C … T195 °C Dc
<Year>
-30 °C ≤ Ta ≤ +60 °C … +175 °C
KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine
II 3G
II 3D
X
X
Short marking:
(A short marking is only made if not possible differently for reason of space or functioning.)
RADEX®-NC
RADEX®-NC HT
<Year>
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
35 of 37
11
Enclosure A
Advice and instructions regarding the use in
10.4
potentially explosive atmospheres
marking of coupling for potentially explosive atmospheres
Deviating marking applied until 31st October 2019:
Short marking:
II 2GD c IIC T X/I M2 c X
II 2G c IIC T6, T5, T4, T3 resp. T2 -30 °C  Ta  +75 °C, +90 °C,
+125 °C, +190 °C resp. +200 °C
II 2D c T 110 °C -30 °C  Ta  +100 °C/I M2 c -30 °C  Ta  +140 °C
Complete marking:
Comments on marking
Equipment group I
Equipment group II
Equipment category 2G
Equipment category 3G
Equipment category 2D
Equipment category 3D
Equipment category M2
D
G
Ex h
IIC
IIIC
T6 … T3
T80 °C … T195 °C
-30 °C ≤ Ta ≤ +60 °C … +175 °C
or -30 °C ≤ Ta ≤ +175 °C
Gb, Db, Mb
Gc, Dc
X
Mining
Non-mining
Equipment ensuring a high level of safety, suitable for zone 1
Equipment ensuring a normal level of safety, suitable for zone 2
Equipment ensuring a high level of safety, suitable for zone 21
Equipment ensuring a normal level of safety, suitable for zone 22
Equipment ensuring a high level of safety must be able to be switched off
when an explosive atmosphere occurs
Dust
Gases and vapours
Nonelectrical explosion protection
Gases and vapours of class IIC (including IIA and IIB)
Electrically conductive dusts of class IIIC (including IIIA and IIIB)
Temperature class to be considered, depending on the ambient temperature
Maximum surface temperature to be considered, depending on the ambient
temperature
Permissible ambient temperature from -30 °C to +60 °C resp.
-30 °C to +175 °C
Equipment protection level, high level of safety, analogous to the equipment
category
Equipment protection level, normal level of safety, analogous to the
equipment category
For a safe use of the couplings particular conditions apply
If the symbol
was punched in addition to marking , the coupling component was supplied by KTR as an
unbored or pilot bored version (see chapter 4.2 of the present operating/assembly instructions).
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-26 Pz/Wb
2022-08-08 Pz
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
36 of 37
11
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
10.5 EU Certificate of conformity
EU Declaration of Conformity resp.
Certificate of Conformity
corresponding to EU directive 2014/34/EU dated 26 February 2014
and to the legal regulations adopted for its implementation
The manufacturer - KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine - states that the
RADEX®-NC servo laminae couplings
RADEX®-NC HT servo laminae couplings
in an explosion-proof design described in these assembly instructions are equipment resp.
components corresponding to article 2, 1. of directive 2014/34/EU and comply with the general safety
and health specifications according to enclosure II of directive 2014/34/EU.
This declaration of conformity is issued under the sole responsibility of the manufacturers
KTR Systems GmbH.
The coupling described in here complies with the specifications of the following standards/rules:
EN ISO 80079-36:2016-12
EN ISO 80079-37:2016-12
EN ISO/IEC 80079-38:2017-10
IEC/TS 60079-32-1:2020-01-24
The RADEX®-NC or RADEX®-NC HT is in accordance with the specifications of the directive
2014/34/EU.
According to article 13 (1) b) ii) of directive 2014/34/EU the technical documentation is deposited with
the notified body (type examination certificate IBExU05ATEXB002 X):
IBExU
Institut für Sicherheitstechnik GmbH
Identification number: 0637
Fuchsmühlenweg 7
09599 Freiberg
Rheine,
Place
2022-07-26
Date
Please observe protection
note ISO 16016.
Drawn:
Verified:
i. V.
Reinhard Wibbeling
Engineering/R&D
2022-07-26 Pz/Wb
2022-08-08 Pz
i. V.
Johannes Deister
Product Manager
Replacing:
Replaced by:
KTR-N dated 2020-02-14
RADEX®-NC
RADEX®-NC HT
Operating/Assembly instructions
10
KTR-N
Sheet:
Edition:
47210 EN
37 of 37
11
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
10.6 UK Declaration of conformity
UK Declaration of Conformity resp.
Certificate of Conformity
corresponding to UK directive SI 2016 No. 1107 dated 26 February 2014
and to the legal provisions adopted for its implementation
The manufacturer - KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine - states that the
RADEX®-NC servo laminae couplings
RADEX®-NC HT servo laminae couplings
in an explosion-proof design described in these assembly instructions are equipment resp.
components corresponding to directive SI 2016 No. 1107 and comply with the general safety and
health requirements according to directive SI 2016 No. 1107.
This declaration of conformity resp. certificate of conformity is issued under the sole responsibility of
the manufacturer KTR Systems GmbH.
The coupling described in here complies with the specifications of the following standards/rules:
EN ISO 80079-36:2016-12
EN ISO 80079-37:2016-12
EN ISO/IEC 80079-38:2017-10
IEC/TS 60079-32-1:2020-01-24
The RADEX®-NC or RADEX®-NC HT is in accordance with the specifications respectively the
applicable specifications of directive SI 2016 No. 1107.
According to directive SI 2016 No. 1107 the technical documentation is deposited with the notified
body:
Eurofins CML
Identification number: 2503
Rheine,
Place
2022-07-26
Date
Please observe protection
note ISO 16016.
Drawn:
Verified:
i. V.
Reinhard Wibbeling
Engineering/R&D
2022-07-26 Pz/Wb
2022-08-08 Pz
i. V.
Johannes Deister
Product Manager
Replacing:
Replaced by:
KTR-N dated 2020-02-14
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