Fault Tracing; Contents Of This Chapter; General; Emergency Stop Safety Relay - ABB Q951 User Manual

Fault tracing

Contents of this chapter

This chapter provides general diagnostics and troubleshooting tips.

General

If you cannot reset the emergency stop function with the emergency stop reset button [S62],
check the reset circuit connections. Refer to the circuit diagrams delivered with the drive.
Use a multimeter to measure the STO circuit connections, if the inverter unit generates one
or more of these faults:
• STO hardware failure (5090)
• Safe torque off 1 loss (FA81)
• Safe torque off 2 loss (FA82)
For more information, see the hardware and firmware manuals.

Emergency stop safety relay

ACS880-07CLC drives with option +Q951+Q984

￭
The type of the emergency stop safety relay [A640] is Phoenix Contact PSR-MC34.
This table gives the indications of the Phoenix Contact PSR-MC34 relay:
PWR LED IN1/2 LED
ON OFF
ON ON
K1 LED K2 LED
OFF OFF
OFF OFF
State
All relays are not activated. The sensor circuit is off.
Possible error, see the data sheet of the relay.
The sensor circuit is active. Relays K1 and K2 are
ready to start and await reset/start command.
Fault tracing 47
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