Initial Coupled Start-Up
After initial uncoupled start-up, the following steps should be taken to ensure safe coupled
operation:
1. Follow the procedure stated in General Maintenance, Machine Alignment section to align
the motor to the driven machine.
2. Prepare the coupling for operation in accordance with the coupling manufacturer’s
instructions. Note any match marks on the couplings and assemble accordingly. For sleeve
bearing motors, verify that the correct limited endfloat coupling has been installed. The
endfloat limits can be found on the certified drawing.
3. Ensure that all personnel are at a safe distance from rotating parts. Start the motor in
accordance with instructions supplied with the motor control.
4. If the motor rotor fails to start turning in a second or two, shut off the power supply
immediately. This can result from:
a. Too low a voltage at the motor terminals.
b. The load is too much for the rotor to accelerate.
c. The load is frozen up mechanically.
d. All electrical connections are not made.
e. Single phase power has been applied.
f. Any combination of the above.
Investigate thoroughly and take corrective action before attempting a restart.
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