Fault tracing
Contents of this chapter
This chapter provides general diagnostics and troubleshooting tips.
Fault tracing
The emergency stop safety relay [A640] type is Phoenix Contact PSR-MC34.
This table gives the indications of the Phoenix Contact PSR-MC34 relay:
StateK2 LEDK1 LEDIN1/2 LEDPWR LED
All relays are not activated. The sensor circuit is off.
Possible error, see the data sheet of the relay.
OFFOFFOFFON
The sensor circuit is active. Relays K1 and K2 are
ready to start and await reset/start command.
OFFOFFONON
The sensor circuit is active. All relays are picked up.ONONONON
Possible error, see the data sheet of the relay.Other LED combination
For more information, see the data sheet of the relay (www.phoenixcontact.com).
Use a multimeter to measure the STO circuit connections, if the drive generates one or
more of these faults:
• STO hardware failure (5090)
• Safe torque off 1 loss (FA81)
• Safe torque off 2 loss (FA82)
Refer to the circuit diagrams delivered with the drive.
For more fault tracing possibilities, see the hardware and firmware manuals of the drive.
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Fault tracing 29
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