Operating Instructions

SED2 VFD NEMA Type 3R/3RHE Bypass Operating Instructions
30 Siemens Building Technologies, Inc.
( ) 16. If motor rotation in bypass mode is correct, proceed to Step 17.
If motor rotation in bypass mode is NOT correct, check the following and perform as
described:
• Turn OFF the incoming power feed to the drive. Since the correct rotation in
drive mode was previously established, do not change any output wires at
motor.
• Instead, verify that power to the input device is OFF. Swap L1 & L2 on the
input side of the circuit breaker/disconnect switch. This will affect rotation in
the bypass operation only. Once connections are complete and tight, reapply
incoming power and repeat Step 15 to recheck the rotation direction.
( ) 17. Verify that running at full speed will NOT damage the system.
Run the motor in bypass by turning the Drive-Off-Bypass switch to BYPASS.
Record all the phase voltages and currents at this time to ensure that they are balanced
and within ratings.
( ) 18.
Turn the Drive-Off-Bypass switch to DRIVE and set panel to auto start/stop. Check
speed references from application specific devices for appropriate operation.
This completes the startup procedure for the SED2 with Bypass.