Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 265)

TROUBLESHOOTING 10-23
1557-UM050F-EN-P – June 2013
6. Installation of Line side converter Assembly in Drive
NOTE: Before putting the heatsink stack back to the drive, check the new device resistance.
CAUTION: Be very careful, While taking the heatsink stack out or
putting in the drive, do not touch the snubber and sharing/diagnostic
resistors. Always check the resistors before taking the stack out and
after putting the stack back in the drive.
Mount heatsink assembly onto the set of the heatsink stack mounting insulator screws. Reconnect the
copper bus with the heatsink bus links. Reconnect snubber and sharing/diagnostic resistor leads back
to the heatsink and snubber capacitor, which were disconnected in step 1.
Mount the circuit board assembly loosely on the right hand side only. Guide the S.C.R., diagnostic
resistor and thermistor lead (if applicable) through the appropriate wiring clearance holes of the circuit
board mounting plate. Reassemble hardware on the left side of the circuit board assembly and torque
all mounting hardware for the circuit board mounting assembly. Connect back the fiber optics, 48 volt
D.C. supply leads, diagnostic resistor lead, cathode and gate leads, and thermistor (if applicable) lead.
If the vertical door mullion was removed for access, it must be re-installed and door interlock
operation must be tested.
7. Calibration and Gate Pulse Verification
Refer to page 10-14 and follow the SCR Gate Driver Calibration and Gate Pulse Verification Procedure.