SED2 Variable Frequency Drives Startup Procedure and Checklist
Document Number 155-718
September 14, 2011
Siemens Industry, Inc. Page 5
( ) 9.
With correct motor rotation, manually run the drive throughout its entire operating range while
observing operation.
• If the drive trips on over-current during acceleration adjust the acceleration time rate via
Parameter P1120.
• If the drive trips on over-voltage during deceleration, adjust the deceleration time rate via
Parameter P1121.
• If excessive vibration of the driven load is noted at specific input frequencies, use Skip
Frequency Parameters P1091 through P1094 to eliminate this vibration.
( ) 10.
Determine whether the remote speed reference is a 0 to 10 Vdc or a 4 to 20 mA signal. Connect
signal wires and place analog input DIP Switch in the appropriate position.
( ) 11.
Check the signal for proper polarity. Observe if the remote speed command can achieve the
minimum and maximum speeds desired. If not, scale as required.
( ) 12.
Set the DRIVE/OFF/BYPASS switch to OFF. When the drive is in the run mode, it will coast to a
stop.
For units with three contactors, set the Drive Test ON/OFF switch to ON. Verify that the drive
input contactor energizes.
( ) 13.
Make additional drive application parameter settings as required, and record them in
Appendix: Parameter Settings.
( ) 14. BYPASS TEST—Be prepared to monitor rotation of the motor in bypass operation.
“Bump” the DRIVE/OFF/BYPASS switch to BYPASS and then quickly back to OFF. Check the
motor rotation.
CAUTION:
Do NOT allow the motor to operate in bypass mode unless the motor rotation is correct.
( ) 15. If motor rotation in bypass mode is correct, skip to the next step.
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 and 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 14 to recheck
the rotation direction.
( ) 16.
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.
AC input voltage: Phase A____________ Phase B ___________ Phase C _____________
AC output voltage: Phase A___________ Phase B ___________ Phase C _____________
Output Current: Phase A ____________ Phase B ___________ Phase C _____________
Display Current: _______________Software Version: _________________________
( ) 17.
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 VFD with Conventional Bypass Option.
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