Rockwell Automation Allen-Bradley MCP Instruction Leaflet
Rockwell Automation Allen-Bradley MCP is a motor circuit protector designed to provide short-circuit protection in motor control circuits. It features an instantaneous (magnetic-only) trip unit, suitable for reverse feed applications, and complies with UL489 and IEC 947-2 standards. The MCP is available in 3-pole frames with a rating of 600A and can be used as part of a combination controller where other circuit protective functions are performed by other devices within the controller.
Advertisement
Advertisement
Bul. 140M
Instruction Leaflet for Installation of Q-Frame
Motor Circuit Protector, Type MCP (with Electronic Trip Device)
a
WARNING
CONTACT WITH ENERGIZED EQUIPMENT CAN
RESULT IN DEATH, SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE. DO NOT
AlTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING WITH THE TASK,
AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
ALLEN-BRADLEY IS NOT LIABLE FOR THE
MISAPPLICATION OR MISINSTALLATION OF ITS
PRODUCTS.
The user is cautioned to observe all recommendations, warnings, and cautions relating to the safety of personnel and equipment as well as all general and local health and safety laws, codes, and procedures.
The recommendations and information contained herein are based on Allen-Bradley experience and judgement, but should not be considered to be all-inclusive or cover- ing every application or circumstance which may arise. If any questions arise, contact Allen-Bradley for further information or instructions.
1. INTRODUCTION
General Information
The Q-Frame instantaneous (magnetic-only)
Motor Circuit Protector (MCP) (Fig. 1-1) has a rating of 600A. . The MCP is available as Type MCP in 3-pole frames only. The MCP is designed to comply with the applicable requirements of Underwrit- ers Laboratories, Inc. Standard UL489 and the Interna- tional Electrotechnical Commission Recommendations
N
O
. IEC 947-2.
The MCP is a UL-recognized component. It is used primarily to provide short-circuit protection as part of a combination controller where other circuit protective functions are performed by other devices within the controller. Since the Q-frame MCP is a non- sealed device, it is marked LINE and LOAD and is not suitable for reverse feed applications.
This instruction leaflet (IL) gives procedures for installa- tion, operation, and field testing of Q-frame MCPs.
For this publication, the term motor circuit protection
(MCP) shall also include instantaneous (magnetic) only circuit interrupters.
I
Fig. 1-1 Q-frame Type MCP Motor Circuit
Protector
2. INSTALLATION
The installation procedure consists of inspecting the
MCP and, as applicable, installing accessories, and ter- minals; mounting the MCP; connecting the line and load conductors; torquing terminals; and attaching terminal shields. The MCP, accessories, mounting hardware, and unmounted terminals may be supplied in separate pack- ages. To install the MCP, perform the following steps.
Note: Internal accessory installation in any type of circuit breaker should be done before the circuit breaker is mounted and connected. Refer to individ-
40752-081(1) Effective 2/03
Page 2 ual accessory instruction leaflets for specific instal- lation instructions on field installable accessories.
2-1. Compare nameplate data with existing equipment ratings and system requirements to make sure that the MCP is suitable for the intended installation.
Prior to mounting, confirm that the MCP has not been damaged during transit or initial handling.
2-2. To install internal accessories, remove cover screws and cover.
Note: The MCP handle must be in the tripped or OFF position to remove the cover.
2-3. If not already installed, mount accessories (if required) in MCP.
Note: When required to be removed or replaced, sta- tionary interphase barriers can only be installed or removed with circuit breaker in the tripped or open position.
2-4. After any internal accessories are installed, and with the MCP in the tripped position, make sure that stationary interphase barriers are properly installed in base. Install cover and secure with panhead screws. Torque to 20-22 Ib-in. (2.26-2.49 N.m).
2-5. If not already installed, mount wire connecting ter- minals as shown in Fig. 2-1. Secure the terminals to the MCP using two panhead slotted screws and lockwashers. Torque to 6-8 Ib-ft. (8.14-10.85 N.m).
With the MCP mounted and before the conductors are installed and conductor clamping screws inserted, the terminal mounting screws may be checked for correct torque.
THE VOLTAGES IN ENERGIZED EQUIPMENT CAN
CAUSE DEATH OR SEVERE PERSONAL INJURY.
BEFORE MOUNTING THE MCP IN AN ELECTRICAL
SYSTEM, MAKE SURE THERE IS NO VOLTAGE
PRESENT WHERE WORK IS TO BE PERFORMED.
Note: Depending on the equipment configuration, the
MCP can be mounted using different styles of hard- ware. The following steps describe how to mount the
MCP using standard hardware. When special hard- ware is needed (for example, with the motor opera- tor), the instruction leaflet describing the accessory also describes the special mounting arrangements.
2-6. To mount the MCP, perform the following steps: a. For individual surface mounting, drill mounting panel using the drilling plan shown in Fig. 2-2.
For panelboard mounting, only load end support mounting holes are required. For dead front cover applications, cut out cover to correct escutcheon dimensions, see Fig. 2-3. b. If MCP includes factory or field installed internal accessories, make sure accessory wiring is accessible when the MCP is mounted.
Note: Labels with accessory connection schematic diagrams are provided on the side of the MCP. c. Position MCP on mounting surface.
Table 2-1. Terminal Types 000
Terminal
Cat. No.
Terminal
Material
Body
Screw
Head
TY Pe
140U-QTLA2
140U-Q-TLC2
4
4
4
Aluminum Socket
Aluminum Socket
Copper Socket
Aluminum Socket
Aluminum Socket
AWG Wire
Range
250-350
400-500 0
250-350 0
4/0-600
4-4/0
Metric Wire
Range (MM')
120-1 50
185-240
120-1 50
120-300
25-120
Wire
Type
Cu/Al
Cu/Al
C u
Cu/Al
Cu/Al
Torque Value
Ib-in. (N.m)
275 (31 . l )
275 (31 . l )
275 (31 . l )
400 (45.2)
275 (31.1) electrical clearance and creepage distances between phases is 1.690 inches.
0 No hardware or connector should be installed in a manner to reduce the electrical clearance between the underneath side of the phase termination (line or load) and ground without the addition of supplementary insulation.
4 conductors may be required to satisfy ampacity requirements for local installation rules.
Contact Allen-Bradley for availability.
40752-081(1) Effective 2/03
d. Install MCP mounting screws and washers.
Tighten screws firmly, but do not exceed 28 Ib-in.
(3 N.m). a
CAUTION
WHEN ALUMINUM CONDUCTORS ARE USED, THE
APPLICATION OF A SUITABLE JOINT COMPOUND IS
RECOMMENDED TO REDUCE THE POSSIBILITY OF
TERMINAL OVERHEATING. OVERHEATING CAN
CAUSE NUISANCE TRIPPING AND DAMAGE TO THE
MCP.
2-7. Connect line and load conductors and accessory leads.
2-8. After the MCP is installed, check all mounting hard- ware and terminal connecting hardware for correct torque loading. Torque values for line/load terminals are given in Table 2-1 and on the MCP nameplate.
2-9. Install line terminal cover on MCP cover with mount- ing screws provided. Torque to 20-22 Ib-in. (2.26-
2.49 N.m).
2-10. When step-type terminals are used terminal shields (supplied with terminals) must be installed on the MCP (Fig. 2-4) and secured using retainer and screws included with the terminal shield kit. Warning label supplied with the kit must be attached to the MCP cover.
Terminal Lug
Panhead Screws
Panhead
140U-Q-TLC2 and Lockwashers
Screws or (Installed before and
140U-Q-TLA2
Cable Clamping
Lockwashers Terminal Lug Screws)
Fig. 2- 1 Terminal Installation
Line End
0.250-20
(M6-1
(4
.O)
Holes)
Page 3
HAZARDOUS VOLTAGE CONDITIONS CAN CAUSE
DEATH OR SEVERE PERSONAL INJURY. MAINTAIN
ORIGINAL ELECTRICAL CLEARANCE AND
CREEPAGE SPACINGS AT TERMINATIONS.
3-Pole MCP
Load End
Dimensions in Inches
(Millimeters)
Fig. 2-2 3-Pole MCP Mounting Bolt Drilling Plans
40752-081(1) Effective 2/03
Page 4
3. REPLACEMENT OF EXISTING MOTOR CIRCUIT
PROTECTORS Line End
%
3-Pole MCP
I
3.438
(87.33)-w
1.719
*
(43.66)
T 5-
I
3.281
(83.34)
I
2.292
(58.22)
4
Load End
I
Fig. 2-3 MCP Escutcheon Cutout Dimensions for 3-pole
MCP
Panel Escutcheon Cutout Sizes
Existing cutouts must be modified to agree with requirements shown in Fig. 2-3.
Handle Throw Positions
Existing handle mechanisms may need to be modified or replaced. Consult Allen-Bradley for additional information.
Internal Accessories
Only Q-Frame accessories may be used.
External Accessories
Motor operators must be replaced.
Key interlock mounting brackets must be replaced.
Consult Allen-Bradley for replacement styles.
Terminal Wire Connectors
Terminals must be replaced, see Table 2-1 for replacement types.
Other
Unless noted above, all other physical character- istics are the same. a
WARNING
CONTACT WITH ENERGIZED EQUIPMENT CAN
RESULT IN DEATH, SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE. DO NOT
ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING WITH THE TASK,
AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
Note: When replacing an existing MCP or circuit breaker of the types listed above, make sure the volt- age, continuous current, and interrupting rating of the new MCP are suitable.
40752-081(1) Effective 2/03
Page 5
4. MANUAL OPERATION AND TRIP UNIT
ADJUSTMENT
Manual Operation
Manual operation of the circuit breaker is controlled by the MCP handle and the PUSH-TO-TRIP button in the trip unit. The MCP handle has three positions, two of which are shown on the cover with raised lettering to indi- cate ON and OFF. On the handle, ON, OFF, and TRIP are also shown by a color-coded strip for each MCP han- dle position: red for ON, white for TRIP, and green for
OFF (see Fig. 4-1).
MCP Reset
After a trip operation, the MCP is reset by moving the
MCP handle to the Reset (extreme OFF) position.
Note: In the event of an automatic tripping operation, no MCP should be reclosed until the cause of trip is known and the situation rectified.
PUSH-TO-TRIP Button
The PUSH-TO-TRIP button operates the MCP tripping function and may be used to periodically exercise the operating mechanism. The rating plug in electronic trip units contains the PUSH-TO-TRIP button which is oper- ated by finger pressure.
Electronic Trip Unit Adjustment
The instantaneous trip level of the trip unit can be adjusted by rotating the adjustment switch on the front face of the trip unit with a screwdriver. The switch has several settings as indicated on the nameplate with let- ters A through H (Fig. 4-1). The ampere settings are shown on the MCP nameplate and in Table 4-1. To adjust the setting, rotate the switch clockwise until arrow on switch points to desired setting.
Trip Units
For additional information on electronic trip units, refer to
Instruction Leaflet 40752-072
5. INSPECTION AND FIELD TESTING
MCPs are designed to provide years of almost maintenance-free operation. The following procedure describes how to do a limited amount of field inspection and testing of an MCP.
Inspection
MCPs in service should be inspected periodically. The inspection should include the following checks 5-1 through 5-8. a
WARNING
THE VOLTAGES IN ENERGIZED EQUIPMENT CAN
CAUSE SEVERE PERSONAL INJURY OR DEATH.
BEFORE INSPECTING THE MCP IN AN ELECTRICAL
SYSTEM, MAKE SURE THE MCP IS SWITCHED TO
THE OFF POSITION AND THAT THERE IS NO
VOLTAGE PRESENT WHERE WORK IS TO BE
PERFORMED.
A A
SOME COMMERCIAL CLEANING AGENTS WILL
DAMAGE THE NAMEPLATES OR MOLDED PARTS.
MAKE SURE THAT CLEANING AGENTS OR
SOLVENTS USED TO CLEAN THE MCP ARE
SUITABLE FOR THE JOB.
5-1. Remove dust, dirt, soot, grease, or moisture from the surface of the MCP using a lint-free dry cloth, brush, or vacuum cleaner. Do not blow debris into
MCP. If contamination is found, look for the source and eliminate the problem.
5-2. Switch MCP to ON and OFF several times to be sure that the mechanical linkages operate freely and do not bind. If mechanical linkages do not oper- ate freely, replace MCP.
5-3. With the MCP in the ON position, press the PUSH-
TO-TRIP button to mechanically trip the MCP. Trip, reset, and switch MCP ON several times. If mecha- nism does not reset each time the MCP is tripped, replace the MCP.
5-4. Check base, cover, operating handle, and handle barrier for cracks, chipping, and discoloration. MCP should be replaced if cracks or severe discoloration is found.
5-5. Check wire connecting terminals and other type bus bar connectors for looseness or signs of overheat- ing. Overheating will show as discoloration, melting, or blistering of conductor insulation, or as pitting or melting of conductor surfaces due to arcing. If there is no evidence of overheating or looseness, do not disturb or tighten the connections. If there is evi-
40752-081(1) Effective 2/03
dence of overheating, terminations should be cleaned or replaced. Before re-energizing the MCP, all terminations and cables should be refurbished to the originally installed condition. essary. deterioration of electrical connections. Check area where MCP is installed for any safety hazards, including personal safety and fire hazards and take required precautionary actions.
Handle
Position
Indicator
Color: Red -
White
Green
ON
- TRIP
- OFF (Reset)
International u
Symbols
-
- O N
I be field tested periodically using the electronic test kit. Contact Allen-Bradley for details.
Field Testing
Any field testing should be done in accordance with appli- cable NEMA Standard.
Table 4-1. Instantaneous Trip Settings (Amperes)
Cam
Setting
MCP Catalog Number
140M-Q8P-D60 140M-Q8P-D40 140M-Q8P-D25
A 1800 1000 500
B
C
D
E
F
G
H
2400
3000
3600
4200
4800
5400
6000
1250
1500
2000
2500
3000
3500
4000
600
800
1000
1250
1500
2000
2500
/
Electronic
Trip Unit lnstahtaneous
Trip
Adjustment
Switch
Fig. 4- 1 MCP Manual Controls
I
PUSH-TO-TRIP
Button
Page 6
40752-081(1) Effective 2/03 4
40752-081(1) Effective J2/03
NOTES
Page 7
40752-081(1) Effective: 2/03
Printed in USA/TQC
Page 8

Public link updated
The public link to your chat has been updated.
Advertisement