108 Unidrive M/HS Frame 5 to 6 Power Installation Guide
Issue Number: 9
6.6 Electrical Installation
Overvoltage category
Drives have been evaluated for OVC III.
Supply
The drives are suitable for use on a circuit capable of delivering not more than 100,000 RMS
symmetrical amperes, 600 Vac Maximum.
Terminal Torque
Terminals must be tightened to the rated torque as specified in the Installation Instructions.
Wiring Terminals
Drives must be installed using cables rated for 75 °C operation, copper wire only.
Where possible, UL Listed closed-loop connectors sized according to the field wiring shall be used
for all field power wiring connections.
Ground connection instructions
UL Listed closed-loop connectors sized according to the field wiring shall be used for grounding
connections.
Branch circuit protection
The fuses and circuit breakers required for branch circuit protection are specified in the Installation
Instructions.
Opening of branch circuit
Opening of the branch-circuit protective device may be an indication that a fault has been
interrupted. To reduce the risk of fire or electric shock, the equipment should be examined and
replaced if damaged. If burnout of the current element of an overload relay occurs, the complete
overload relay must be replaced.
Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit
protection must be provided in accordance with the National Electrical Code (NEC), The Canadian
Electrical Code, and any additional local codes.
Dynamic braking
M100, M101, M200, M201, M300 or M400, frame sizes 1 to 4 have been evaluated for dynamic
braking applications. Other drive models have not been evaluated for dynamic braking.
6.7 Motor overload protection and thermal memory retention
The devices incorporate solid state overload protection for the motor load. The protection levels are
expressed as a percentage of full-load current. Refer to the Control User Guide for further
information.
In order for the motor protection to work properly, the motor rated current must be entered into Pr 06
or Pr 05.007.
The protection level may be adjusted below 150 % if required. Refer to the Control User Guide for
further information.
All models are provided with thermal memory retention.
6.8 External Class 2 supply
The external power supply used to power the 24 V control circuit shall be marked: "UL Class 2". The
power supply voltage shall not exceed 24 Vdc.
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