Siemens SED2 VFD Start-Up page 5

SED2 Variable Frequency Drives
( ) 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.
Siemens Industry, Inc.
Startup Procedure and Checklist
Document Number 155-718
September 14, 2011
Page 5