1. DELCOS 3100 Electronics
[Display] / Problem
Possible Cause
Remedy
28
[FAULT SR-DRIVE (26)]
Braking resistance over current
A braking resistor is not installed. Occurrence
of this fault, therefore, points to a wiring fault
or to a malfunction on the control board.
Make sure that the current sensor is
connected to phase A on the control
board.
Otherwise contact Gardner Denver
Service.
[FAULT SR-DRIVE (27)] Control
board hardware interlock.
Control board faulty.
Contact Gardner Denver Service.
One phase missing or has significant
undervoltage.
Check phase-to-phase voltages.
Check external fuses.
Incorrect phase sequence.
Check phase sequence.
[FAULT SR-DRIVE (28)]
[FAULT SR-DRIVE (29)]
Phase missing on mains side
or undervoltage.
Check wiring to gate drive board J13
and J14.
Ribbon cable faulty between control board
(PCB94) and gate drive board (PCB95).
Wiring fault in voltage monitoring system.
Control or gate drive board faulty.
Otherwise contact Gardner Denver
Service.
Wiring fault in converter control lines.
Check wiring and plug from gate drive
board to the converter modules.
[FAULT SR-DRIVE (30)]
Intermediate circuit
undervoltage.
Ribbon cable faulty between control board
(PCB94) and gate drive board (PCB95).
Check ribbon cable between control
board (PCB94) and gate drive board
(PCB95).
Converter module(s) faulty.
Control or gate drive board faulty.
Otherwise contact Gardner Denver
Service.
[FAULT SR-DRIVE (31)]
Motor phase A open
Motor cable not connected or faulty.
Check connection and cable of motor
phase A.
Motor winding faulty.
Check continuity of motor phase A.
IGBT control open or faulty (plug J1 and J2
of gate drive board).
Check plug J1 and J2 and wiring from
gate drive board to power electronics.
Control or gate drive board faulty.
Otherwise contact Gardner Denver
Service.
[FAULT SR-DRIVE (32)]
Motor phase B open
Motor cable not connected or faulty.
Check connection and cable of motor
phase B.
Motor winding faulty.
Check continuity of motor phase B.
IGBT control open or faulty (plug J3 and J4
of gate drive board).
Check plug J3 and J4 and wiring from
gate drive board to power electronics.
Control or gate drive board faulty.
Otherwise contact Gardner Denver
Service.
Only in systems with 3-phase motor:
[FAULT SR-DRIVE (33)]
Motor phase C open
Motor cable not connected or faulty.
Check connection and cable of motor
phase C.
Motor winding faulty.
Check continuity of motor phase C.
IGBT control open or faulty (plug J5 and J6
of gate drive board).
Check plug J5 and J6 and wiring from
gate drive board to power electronics.
Control or gate drive board faulty.
Otherwise contact Gardner Denver
Service.