dV/dT Filter
Series A
380 - 600 VAC
USER MANUAL
PART NO. INSTR - 019
REL. 110726
REV. 006
© 2011 MTE Corporation
IMPORTANT USER INFORMATION
NOTICE
The MTE Corporation dV/dT Filter is designed to reduce dv/dt and peak voltages to
motors fed from a wide variety of PWM inverters. The suitability of this filter for a
specific application must therefore be determined by the customer. In no event will
MTE Corporation assume responsibility or liability for any direct or consequential
damages resulting from the use or application of this filter. Nor will MTE Corporation
assume patent liability with respect to the use of information, circuits or equipment
described in this instruction manual.
TABLE OF CONTENTS
MODEL NUMBER CODE SYSTEM:..............................................................................................................4
SPECIFICATIONS.............................................................................................................................................5
RATINGS ...............................................................................................................................................5
SERVICE CONDITIONS ..........................................................................................................................6
CURRENT RATING ................................................................................................................................6
MAXIMUM MOTOR LEAD LENGTH: 1000 FEET ......................................................................................6
DV/DT FILTER PERFORMANCE ..................................................................................................................7
UNIT WEIGHTS.................................................................................................................................................9
FILTER INSTALLATION ..............................................................................................................................10
PANEL INSTALLATIONS .............................................................................................................................11
OPEN PANEL 3 – 22 AMPS ..................................................................................................................11
OPEN PANEL 27 – 65 AMPS ................................................................................................................12
OPEN PANEL 80 – 110 AMPS ..............................................................................................................13
OPEN PANEL 130 - 305 AMPS .............................................................................................................14
HIGH CURRENT COMPONENTS ............................................................................................................15
MOUNTING EXAMPLES .......................................................................................................................16
ENCLOSED UNITS..........................................................................................................................................18
ENCLOSED NEMA 1 UNITS 3 – 22 AMPS ............................................................................................19
ENCLOSED 3R UNITS 3 – 22 AMPS ......................................................................................................20
ENCLOSED NEMA 1 UNITS 27 – 110 AMPS ........................................................................................21
ENCLOSED 3R UNITS 27 – 110 AMPS ..................................................................................................22
NEMA 1-2 & 3R UNITS 130-600 AMPS ..............................................................................................23
WIRING CONNECTIONS ..............................................................................................................................24
INTERCONNECTION DIAGRAM................................................................................................................25
TERMINAL WIRING SPECIFICATIONS ...................................................................................................26
THERMAL SWITCH.......................................................................................................................................27
DESCRIPTION .................................................................................................................................................28
WIRING.............................................................................................................................................................30
STARTUP ..........................................................................................................................................................31
TROUBLESHOOTING....................................................................................................................................32
1. IMPORTANT SAFETY INFORMATION
WARNING
ONLY A QUALIFIED ELECTRICIAN CAN CARRY OUT THE ELECTRICAL
INSTALLATION OF THIS FILTER
WARNING
High voltage is used in the operation of this filter. Use Extreme caution to avoid contact
with high voltage when operating, installing or repairing this filter. INJURY OR DEATH
MAY RESULT IF SAFETY PRECAUTIONS ARE NOT OBSERVED.
After removing power, allow at least five minutes to elapse and verify that the capacitors
have discharged to a safe level before contacting internal components. Connect a DC
voltmeter across the capacitor terminals. Start with the meter on the highest scale and
progressively switch to a lower scale as the indicated voltage falls below the maximum
value of the scale used.
WARNING
The opening of the branch circuit protective device may be an indication that a fault current has
been interrupted. To reduce the risk of fire or electrical shock, current-carrying parts and other
components of the filter should be examined and replaced if damaged.
WARNING
An upstream disconnect/protection device must be used as required by the National Electrical
Code (NEC).
Data subject to change without notice
1
Part No. INSTR-019 REL. 110726 REV. 006
1. IMPORTANT SAFETY INFORMATION
WARNING
Even if the upstream disconnect/protection device is open, the inverter down stream of the filter
may feed back high voltage to the filter. The inverter safety instructions must be followed.
INJURY OR DEATH MAY RESULT IF THE INVERTER SAFETY PRECAUTIONS ARE
NOT OBSERVED.
WARNING
The filter must be grounded with a grounding conductor connected to all grounding terminals.
WARNING
Only spare parts obtained from MTE Corporation or an authorized MTE distributor can
be used.
Data subject to change without notice
2
Part No. INSTR-019 REL. 110726 REV. 006
2. INTRODUCTION
This manual was specifically developed to
assist in the installation, interconnection
and operation of the MTE Corporation
dV/dT filter.
This manual is intended for use by
personnel experienced in the operation and
maintenance of inverters. Because of the
high voltages required by the filter, inverter
and the potential dangers presented by
rotating machinery, it is essential that all
personnel involved in the operation and
maintenance of this filter know and practice
the necessary safety precautions for this
type of equipment. Personnel should read
and understand the instructions contained
in this manual before installing, operating or
servicing the filter and inverter to which it is
connected.
If the equipment is not going to be put into
service upon receipt, cover and store the
filter in a clean, dry location. After storage,
ensure that the equipment is dry and that
no condensation has accumulated on the
internal components of the filter before
applying power.
Repair/Exchange Procedure
MTE Corporation requires a Returned
Material Authorization Number before it can
accept any filters that qualify for return or
repair. If problems or questions arise during
installation, setup, or operation of the filter,
please call us for assistance at:
Inside Sales Manager
Phone: 262-946-2800
Upon Receipt of this Filter:
FAX: 262-253-8222
The MTE dV/dT Filter has been subjected
to demanding factory tests before shipment.
Carefully inspect the shipping container for
damage that may have occurred in transit.
Then unpack the filter and carefully inspect
for any signs of damage. Save the shipping
container for future transport of the filter.
Quick view:
1.
2.
3.
4.
5.
6.
Specification details: pg 4
Interconnection diagram: pg 24
Panel installations: pg 10 - 16
Enclosed installations: pg 17 - 23
Filter schematic / wiring: pg 30
Problem solutions: pg 32.
In the event of damage, please contact
and file a claim with the freight carrier
involved immediately.
Data subject to change without notice
3
Part No. INSTR-019 REL. 110726 REV. 006
3. MODEL NUMBER CODES
Model Number Code System:
DV A X Y _ _ _ _
YY
dV/dT filter
Series Version: A, X
Options
“X” denotes Non standard configurations
Mechanical Configuration
P = Panel Mount
G = General Purpose NEMA 1
W = NEMA 3R
Indicates Physical Size:
A, B, C, D, (A is smallest)
Current Rating
(i.e. 0045 is 45 Amps)
Data subject to change without notice
4
Part No. INSTR-019 REL. 110726 REV. 006
4. SPECIFICATIONS
SPECIFICATIONS
Ratings
Table 1
380 - 600 VAC, 60 Hz Filter
Ratings
Power Dissipation
Maximum Efficiency
@ Rated Current
Output Amps (Typical)
(Typical)
RMS
(%)
(Watts)
88.47
3
313
91.20
4
309
94.52
7
325
95.57
9
334
96.53
12
345
97.46
17
354
97.95
22
369
98.13
27
411
98.47
35
436
98.90
45
402
99.03
55
429
99.19
65
423
99.32
80
440
99.46
110
476
99.47
130
554
99.55
160
574
99.63
200
593
99.69
250
623
99.71
305
703
99.68
365
947
99.71
415
972
99.76
515
985
99.80
600
977
Filter
Service Conditions for the above:
Full load 3 phase motor
2000 Hertz switching frequency
60 Hertz output frequency
1000 ft motor cable
25 °C
Data subject to change without notice
5
Part No. INSTR-019 REL. 110726 REV. 006
4. SPECIFICATIONS
Series A dV/dT Filters
Service Conditions
Input voltage: 380 – 600 VAC +/- 10%, 60Hz
Input voltage wave form: PWM
Switching Frequency: 900 Hz – 8 kHz
Operating frequency: 6 – 60 Hz without de-rating
Ambient Temperature: 50 °C Open filters, 40 °C Enclosed filters
Altitude without de-rating: 1000 meters
Relative Humidity: 0 to 99% Non- condensing
Agency Approvals
UL and cUL listed to UL508 Type MX and CSA-C22.2 No 14-95
File E180243 (3 – 1000 HP, 120VAC through 600 VAC
50. 50/60, 60 Hz Three Phase
Note: Short Circuit rating not required under Exception No.1 of UL508A SB4.2.1 effective 4/25/06
Current Rating
Continuous current rating: 100% RMS
Intermittent current ratings: 150 % for 1 minute, 200 % for 10 sec.
Loading:
Conventional 3 phase motors
“No load” continuous operation
Maximum motor lead length: 1000 feet
Insertion loss: 3% of rated voltage maximum
Audible noise level at two meters: 65 DB-A
Performance:
Maximum peak motor terminal voltage with 1000 ft cable 150% of bus voltage
Maximum dV/dT: 400 volts per microsecond
Data subject to change without notice
6
Part No. INSTR-019 REL. 110726 REV. 006
4. SPECIFICATIONS
dV/dT Filter Performance
Chart 1
22 Amp dV/dt Overall Performance 30hp 480 Vac Motor
1.80
Peak Voltage at Motor in K volts
1.60
1.40
1.20
Unfiltered
With dv/dt
1.5 x Bus
Drive Bus
1.00
0.80
0.60
0.40
0.20
0.00
100 FT
500 FT
1000 FT
Cable Length
1000 FT Full Load 8K Switching
Unfiltered shielded Cable
Data subject to change without notice
1000 Ft Full Load 8K Switching
dV/dT Filtered shielded Cable
7
Part No. INSTR-019 REL. 110726 REV. 006
4. SPECIFICATIONS
CURRENT DERATING FACTOR
Chart 2
Altitude Derating Curve
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0
3300
6600
9900
13200
16500
ALTITUDE (FEET)
Chart 3
dV/dt Filter Current Derating for Drive output Frequency
1.05
Current Derating Factor
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
50
60
70
80
90
100
110
120
130
Output Drive Frequency Hertz
Data subject to change without notice
8
Part No. INSTR-019 REL. 110726 REV. 006
4. SPECIFICATIONS
Unit weights
Table 2
Open
NEMA 1
NEMA 3R
Filter
Amps
Cat PN.
3
DVAP0003
13
1
DVAGA0003
31
7
DVAWA0003
75
8
4
DVAP0004
13
1
DVAGA0004
31
7
DVAWA0004
75
8
7
DVAP0007
14
1
DVAGA0007
32
7
DVAWA0007
76
8
9
DVAP0009
14
1
DVAGA0009
32
7
DVAWA0009
76
8
12
DVAP0012
14
1
DVAGA0012
32
7
DVAWA0012
76
8
17
DVAP0017
18
1
DVAGA0017
36
7
DVAWA0017
80
8
22
DVAP0022
19
1
DVAGA0022
37
7
DVAWA0022
81
8
27
DVAP0027
22
2
DVAGB0027
68
9
DVAWB0027 108
10
35
DVAP0035
26
2
DVAGB0035
72
9
DVAWB0035 112
10
45
DVAP0045
32
2
DVAGB0045
78
9
DVAWB0045 118
10
55
DVAP0055
33
2
DVAGB0055
79
9
DVAWB0055 119
10
65
DVAP0065
39
2
DVAGB0065
85
9
DVAWB0065 125
10
80
DVAP0080
52
3
DVAGB0080 143
9
DVAWC0080 137
10
110
DVAP0110
51
3
DVAGB0110 142
9
DVAWC0110 142
10
130
DVAP0130
64
4
DVAGC0130 229
11
DVAWC0130 235
11
160
DVAP0160
73
4
DVAGC0160 238
11
DVAWC0160 244
11
200
DVAP0200
82
4
DVAGC0200 247
11
DVAWC0200 253
11
250
DVAP0250 101
4
DVAGC0250 266
11
DVAWC0250 272
11
305
DVAP0305 106
4
DVAGD0305 271
11
DVAWD0305 277
11
365
DVAP0365
A1&C
DVAGD0365 263
11
DVAWD0365 269
11
415
DVAP0415 119 A2&B DVAGD0415 285
11
DVAWD0415 291
11
515
DVAP0515 122 A2&B DVAGD0515 288
11
DVAWD0515 294
11
600
DVAP0600 111 A2&B DVAGD0600 277
11
DVAWD0600 283
11
WT
Fig.
Lbs
97
Data subject to change without notice
Cat PN.
9
WT
Fig.
Lbs
Cat PN.
WT
Fig.
Lbs
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Filter Installation
General purpose NEMA 1,2 and 3R
enclosed filters are designed for floor
mounting in an environment suitable for the
enclosure type. Do not install in or near a
corrosive environment. Avoid locations
where the filter would be subjected to
excessive vibrations. Allow a minimum side
and back clearance of eight (8) inches and
front clearance of thirty-six (32 inches for
proper heat dissipation and access. Page
17 will direct you to the appropriate outline
drawings shown in fig. 5 through fig 10.
dV/dT filters are supplied in the following
mechanical configurations:
Panel mounted assemblies
Floor mounted general purpose NEMA 1
& 3R cabinets
Panel mounted filters are designed for
mounting in the vertical plane in the
customer’s enclosure. Include the power
dissipation of the filter along with all the
other components located in the panel to
determine the internal temperature rise and
cooling requirements of the enclosure. An
option NC temperature switch opens if the
reactor exceeds 180 °C. Allow a minimum
side clearance of four (4) inches and a
vertical clearance of six (6) inches for
proper heat dissipation and access within
the enclosure. Panel mounted dV/dT filters
generate heat and should be positioned
away from heat sensitive components.
Ensure that proper panel orientation is
maintained keeping the capacitors away
from reactor heat flow. Avoid locations
where the filter would be subjected to
excessive vibrations.
Figures 1 – 4 contain open panel outline
drawings for the various current ratings and
show proper panel alignment. For filters
above 305 amps refer to table 5 and Figure
A & B for the dimensions of the separately
mounted reactor and the PCB resistor
assembly. A pre-wired cable harness with
connector is supplied with these units. The
PCB resistor assembly should be located a
minimum of 4 inches away from the reactor
in the lowest temperature regions of the
enclosure – generally toward the bottom.
Connect the motor and inverter leads to the
reactor terminals to complete the filter
wiring. See figure 13 page 24.
Data subject to change without notice
10
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Panel installations
Open Panel 3 – 22 Amps
Fig. 1
Data subject to change without notice
11
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Mechanical installation
Open Panel 27 – 65 Amps
Fig. 2
65 Amp shown
Data subject to change without notice
12
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Mechanical installation
Open Panel 80 – 110 Amps
Fig. 3
110 Amp Shown
Data subject to change without notice
13
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Mechanical installation
Open Panel 130 - 305 Amps
Fig. 4
305 Amp shown
Data subject to change without notice
14
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
High current components
dV/dT Filters rated 365 amps through 600 amps are constructed from a reactor and a PCB resistor
assembly connected by a (supplied) 48 inch wire harness. These components are designed to be
mounted vertically within an appropriate enclosure. The reactor generates heat and should be
mounted away from components affected by heat and aligned to allow cooling air to flow through
it. A filter showing correct reactor alignment and cooling is shown in figure 5. The PCB assembly
should be located at least 4 inches from the reactor and in the lowest temperature regions of the
enclosure – generally toward the bottom. An MCC wiring example is shown in Figure 6.
Table 5
Filter
Amps
365
415
515
600
Figure
A1
A2
A3
A4
Fig. A
A
16.5
16.5
16.5
16.5
DIMENSIONS Inches
B
C
D
11.75 10.50
4.85
12.00 11.25
5.12
11.50 11.75
5.62
11.25 12.25
6.12
E
4.6
4.6
4.6
4.6
Fig. B
Fig. C
Data subject to change without notice
15
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Fig. 5
Mounting Examples
OPEN REACTOR & PCB ASSEMBLY
600 amp open reactor & PCB filter shown in customer provided enclosure.
NOTE: Maintain orientation as shown for proper component cooling.
Data subject to change without notice
16
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Fig. 6
350Hp MCC using optional bay for dV/dT installation
Note: The above dv/dt filter example is shown with customer provided support
hardware. Other installation variations are at the customer’s discretion as long as
thermal guidelines are followed.
Data subject to change without notice
17
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Enclosed Units
Table 6
Enclosure
Indicator
GA
GB
GC
GD
WA
WB
WC
WD
Width
Height
Depth
13
17
26.5
26.5
12.5
17.5
26.5
26.5
13
24
47
47
24
31
47
47
13
18
25
25
18*
21*
25*
25*
Cab Part
No.
Cab 13V
Cab 17V
Cab 26C
Cab 26C
Cab 12C
Cab 17C
Cab 26C
Cab 26C
NEMA
Type
NEMA 1
NEMA 1
NEMA 1 -2
NEMA 1 -2
NEMA 3R
NEMA 3R
NEMA 3R
NEMA 3R
Figure
7
9
11
11
8
10
11
11
See table 2 on page 8 for enclosed weights
Table 7
Filter Current
Rating
3
4
7
9
12
17
22
27
35
45
55
65
80
110
130
160
200
250
305
365
415
515
600
General Purpose Cabinets
380 – 480 VAC
NEMA 1
NEMA 3R
CAB-13V
CAB-13V
CAB-13V
CAB-13V
CAB-13V
CAB-13V
CAB-13V
CAB-17V
CAB-17V
CAB-17V
CAB-17V
CAB-17V
CAB-17V
CAB-17V
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-12C
CAB-12C
CAB-12C
CAB-12C
CAB-12C
CAB-12C
CAB-12C
CAB-17C
CAB-17C
CAB-17C
CAB-17C
CAB-17C
CAB-17C
CAB-17C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
CAB-26C
Mounting dimensions and outline drawings for filters mounted in NEMA 1, 3R
Enclosures follow
Data subject to change without notice
18
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Enclosed NEMA 1 units 3 – 22 Amps
Fig. 7 Cab 13V
22 Amp Shown
Data subject to change without notice
19
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Enclosed 3R units 3 – 22 Amps
Fig. 8 Cab 12C
22 Amp Shown
Data subject to change without notice
20
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Enclosed NEMA 1 units 27 – 110 Amps
Fig. 9 Cab 17V
65 Amp Shown
Data subject to change without notice
21
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Enclosed 3R units 27 – 110 Amps
Fig. 10 Cab 17C
65 Amp Shown
Data subject to change without notice
22
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
NEMA 1-2 & 3R units 130-600 Amps
Fig. 11 Cab 26C
600 Amp Shown
Data subject to change without notice
23
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Wiring Connections
The PCB assembly should be located in the
lowest temperature regions of the enclosure generally toward the bottom – the reactor
assembly may be located in any region where
the ambient temperature does not exceed 50
degrees C
WARNING
Input and output wiring to the filter
should be performed by authorized
personnel in accordance with NEC and
all
local
electrical
codes
and
regulations.
Use the cable recommended by the inverter
manufacturer to connect the inverter to the
filter and the filter to the motor. Make certain,
that the selected cable size conforms to the
requirements of the National Electric Code
and all local codes.
Verify that the rating of the inverter is
compatible with the inverter to which it is to be
connected. Follow all detailed inverter
manufacturer
installation
and
safety
instructions. Inverter and motor Cable
selection / placement should be in
accordance with the requirements of the NEC
and all local electrical codes and regulations
For open filters refer to Figures 1 through 4
for the location of Input, output, and ground
connections. For enclosed filters, ground
terminals will be clearly marked. Power wiring
terminations are clearly marked on the
reactor.
Typical filter interconnection diagrams that
follow show wiring between the inverter, filter
and motor. Refer to the inverter user manual
for instructions on interconnecting the inverter
and motor and the correct start-up procedures
for the inverter.
Grounding
The filter must always be grounded with a
grounding conductor connected to ground
terminals.
The optional over temperature switch wiring is
also shown on figure13. The temperature
switch is normally closed and will open when
an internal reactor temperature of 180 °C is
reached.
For cable shield grounding follow the inverter
manufactures recommendations. Fig 13
shows a typical shield ground connection.
Optional Over Temperature Interlock
The filter is designed for use with copper
conductors with a minimum temperature
rating of 75 degrees C.
Table 8 lists the
wire range and terminal torque requirements
for the power input and output connections by
horsepower rating.
The optional over temperature interlock can
be used to turn off the inverter in the event it
is setup to operate with a switching frequency
outside of the range of the filter or an inverter
malfunction. The interlock is a normally closed
contact. Refer to table 9 for contact rating
information and to the inverter user manual
for interconnection information.
For panel mounted filters rated 365 amperes
or more, the filter reactor is supplied unmounted and capacitors and resistors are
supplied as a pre-wired PCB assembly. A
connector allows reactors and PCB to be
separated for installation. Refer to figure 13
for the interconnection diagram.
Data subject to change without notice
24
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Interconnection Diagram
Fig. 13
Data subject to change without notice
25
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Terminal Wiring Specifications
Table 8
Filter
Rating(Amps)
Terminals
Wire Range
(AWG)
3
4
7
9
12
17
22
27
35
45
55
65
80
110
130
160
200
250
305
365
415
515
600
Data subject to change without notice
22-14
22-14
22-14
22-14
22-5
22-5
22-5
22-5
22-5
18-4
18-4
18-4
6-0
3/0 75C
4/0 75C
3/0 90C
4/0 90C
250MCM 75C
400MCM 90C
600MCM
4/0 2X 90C
300MCM 2X 90C
350MCM 2X 90C
600MCM 2X 90C
300MCM 3X 90C
500MCM 3X 90C
26
Terminal
Torque
(in-lbs)
16
16
16
16
16
16
16
16
16
20
20
20
50
250
250
250
325
375
375
375
375
375
375
Part No. INSTR-019 REL. 110726 REV. 006
5. INSTALLATION INSTRUCTIONS
Thermal switch
OPTIONAL OVER TEMPERATURE INTERLOCK CONTACT RATINGS
Table 9
TYPE
BI – METAL THERMAL SWITCH
CONTACT
(NC) NORMALLY CLOSED
RATINGS
6A
120 VAC RESISTIVE
3A
240 VAC RESISTIVE
5A
120 VAC INDUCTIVE
2.5A 240 VAC INDUCTIVE
TEMPERATURE CONTACTS OPEN
Data subject to change without notice
180°C
27
Part No. INSTR-019 REL. 110726 REV. 006
6. FILTER DESCRIPTION
motor torque is not affected by added
voltage drops from the filter.
Series A dV/dT filters are available as
open panel mount and with enclosed
ratings including NEMA 1 ,2 and
NEMA 3R.
Description
MTE Series A dV/dT filters are
designed to protect AC motors from
the damaging effects of long cable
runs between the inverter and
motor. Depending on the turn-on
time of the power semiconductors
used in an inverter and the size of
the motor, cable lengths greater
than eight feet can result in motor
peak voltages that exceed the rating
of the motor’s insulation system.
(See: Effects of Cable Length
section. Chart 4 and table 9. )
These filters have been designed to
meet motor current requirements
based on NEC motor current ratings.
For application using motors that
exceed NEC current ratings use the
next larger filter. Apply the appropriate
altitude current de-rating curves shown
on chart 2.
Filters for motors that will be operated
above 60 Hz should be selected based
on the chart 3 inverter frequency
current de-rating curve shown on page
6.
Typical
applications
include
submersible pumps, HVAC equipment
and process automation lines. Motors
rated 100 HP and below and standard
NEMA B motors are prone to failure as
a result of high voltage spikes and will
benefit from dV/dT filtering.
Systems with multiple motors powered
from a single inverter form a complex
inverter load. The dV/dT filter works
best when applied to each cable /
motor. For multi motor applications
consider using a single MTE sine
wave filter for all motors. In this case
the filter should be sized for the total
motor load. Consult MTE applications
for help in determining the best
solution.
The dV/dT filter is a passive fourth
order device that reduces transmission
line effects of motor cables. It
accomplishes this by dampening the
rate of voltage increase and minimizes
the peak voltage that occurs at the
motor terminals. See performance
chart 1 pg. 5 to view actual results.
Series A dV/dT filters are designed for
use with inverters operated at
switching frequencies between 900 Hz
and 8 kHz. The filter is guaranteed to
reduce the maximum peak motor
voltage (150% of inverter bus voltage)
with 1,000 feet of cable between the
filter and the motor. In specific
applications, the filter has provided
excellent performance with cable runs
up to 3,000 feet. The dV/dT filter has a
3% insertion impedance which ensures
Data subject to change without notice
The dV/dT filter is designed to protect
a single cable/ motor load. Do not
connect other high current electrical
devices to the output of the dV/dT filter.
28
Part No. INSTR-019 REL. 110726 REV. 006
6. FILTER DESCRIPTION
Effects of Cable Length
Chart 4
When to add dV/dT protection
Table 9
Rise Time
(microseconds)
2.00
Critical Lead Length
(meters)
100
Critical Lead Length
(feet)
328
1.0
50
164
0.50
25
82
0.10
5
16
0.05
2.5
8
Data subject to change without notice
29
Part No. INSTR-019 REL. 110726 REV. 006
6. FILTER DESCRIPTION
Wiring
Typical filter Schematic Diagram
Fig. 14
Typical internal filter wiring
Fig. 15
Data subject to change without notice
30
Part No. INSTR-019 REL. 110726 REV. 006
7. START - UP
INJURY OR DEATH MAY RESULT IF SAFETY
PRECAUTIONS ARE NOT OBSERVED.
Startup
Safety Precautions
4. Refer to the inverter user manual for the
inverter startup procedure. Observe all
safety instructions in the inverter user
manual.
Before startup, observe the following warnings and
instructions:
WARNING
5. Disconnect filter output terminals from
the motor.
Internal components of the filter are at line
potential when the filter is connected to the
drive This voltage is extremely dangerous and
may cause death or severe injury if you come
in contact with it.
6. Set the inverter switching frequency
between 2 kHz and 8 kHz. Refer to the
inverter user manual.
CAUTION
WARNING
Damage to the filter may occur if the inverter
frequency is not set between 2 kHz and 8
KHz.
After disconnecting the utility power, wait at
least 5 minutes before doing any work on the
filter connections. After removing power,
allow at least five minutes to elapse and
verify that the capacitors have discharged to
a safe level before contacting internal
components. Connect a DC voltmeter across
the capacitor terminals. Start with the meter
on the highest scale and progressively
switch to a lower scale as the indicated
voltage falls below the maximum value of the
scale used.
7. Turn the inverter ON
8. Confirm that inverter voltage is present at
the input terminals (U1, V1, W1) of the
filter.
9. Confirm that inverter voltage is present at
the output terminals (U2, V2, W2) of the
filter.
Sequence of Operation
10. Disconnect the inverter from the AC Line
and wait 5 minutes.
1. Read and follow safety precautions. Including
those of drive manufactures.
11. Connect the filter output to the motor.
2. After installation, ensure that:
 All filter ground terminals are connected to
ground.
 Power wiring to the utility, inverter, filter and
motor is in accordance with the installation
and connection instructions in Chapter 5.
12. Refer to the inverter user manual for the
motor startup procedure.
WARNING
INJURY OR DEATH MAY RESULT IF THE
INVERTER SAFETY PRECAUTIONS ARE NOT
OBSERVED
3. Check that moisture has not condensed on
the filter components. If moisture is present,
do not proceed with startup until the moisture
has been removed.
CAUTION
WARNING
Damage to equipment or serious injury
may occur if the inverter startup procedures
are not observed..
Use extreme caution to avoid contact with
line voltage when checking for power.
Data subject to change without notice
31
Part No. INSTR-019 REL. 110726 REV. 006
8. TROUBLESHOOTING
WARNING
WARNING
High voltage is used in the operation of
this filter. Use Extreme caution to avoid
contact with high voltage when
operating, installing or repairing this
filter. INJURY OR DEATH MAY RESULT
IF SAFETY PRECAUTIONS ARE NOT
OBSERVED.
Troubleshooting
When
properly
installed,
this
equipment has been designed to
provide maximum safety for operating
personnel.
However,
hazardous
voltages and elevated temperatures
exist within the confines of the
enclosure. Servicing should therefore
be performed by qualified personnel
only and in accordance with OSHA
Regulations.
After removing power, allow at least
five minutes to elapse and verify
that the capacitors have discharged
to a safe level before contacting
internal components. Connect a DC
voltmeter across the capacitor
terminals or terminals U1, V1 or, W1.
Start with the meter on the highest
scale and progressively switch to a
lower scale as the indicated voltage
falls below the maximum value of
the scale used.
To aid in troubleshooting use the diagrams
is shown on page 29. A list of potential
problems and solutions are listed below.
Data subject to change without notice
32
Part No. INSTR-019 REL. 110726 REV. 006
8. TROUBLESHOOTING
PROBLEM:
Voltage is not present at the filter Input terminals.
Possible cause:
Power to the inverter is turned off or shut down.
Solution:
Turn power on, check inverter errors.
Possible cause:
One or more external line fuses are blown.
Solution:
Verify the continuity of line fuses in all phases. Replace as
necessary.
Possible cause:
Damage to inverter - dV/dT interconnect cables
Solution:
Replace damaged cable.
Possible cause:
Inverter setup parameters are incorrect
Solution:
Verify motor current, voltage and shutdown parameters are valid
PROBLEM:
dV/dT filter runs Hot
Possible cause:
Normal operation, reactor and resistors are > 100 °C You may see
resistors smoke as manufacturing wax burns off
Solution:
Caution parts are very hot and may cause burns. Follow installation
guidelines for clearances and check for adequate air flow. Allow 15
minutes to burn off resistor residue.
Possible cause:
Motor coil damage windings shorted
Solution:
Replace motor inspect wiring
Possible cause:
Heat buildup within enclosure
Solution:
Provide clearance and venting for filter components
Possible cause
Drive set to auto tune sends excessive current to filter
Solution:
Only run linear motor velocity profiles with DVDT filters. Set drive for
operation with filters.
Possible cause
Multi motor applications create complex loading and resonances with
DVDT filter
Solution:
Use only one dv/dt filter per drive for a single motor only.
Data subject to change without notice
33
Part No. INSTR-019 REL. 110726 REV. 006
8. TROUBLESHOOTING
Data subject to change without notice
34
Part No. INSTR-019 REL. 110726 REV. 006