ABB ACS800-U1 Application Guide

34 Maintenance and fault tracing
The person responsible for the design of the complete safety function should also note the
Recommendation of Use CNB/M/11.050 published by the European co-ordination of
Notified Bodies concerning dual-channel safety-related systems with electromechanical
outputs:
• When the safety integrity requirement for the safety function is SIL 3 or PL e (cat. 3 or
4), the proof test for the function must be performed at least every month.
• When the safety integrity requirement for the safety function is SIL 2 (HFT = 1) or PL d
(cat. 3), the proof test for the function must be performed at least every 12 months.
This is a recommendation and depends on the required (not achieved) SIL/PL. For
example, safety relays, contactor relays, emergency stop buttons, switches etc. are
typically safety devices which contain electromechanical outputs. The STO circuit of the
inverter unit does not contain any electromechanical components.
 Competence
The maintenance and proof test activities of the safety function must be carried out by a
competent person with adequate expertise and knowledge of the safety function as well as
functional safety, as required by IEC 61508-1 clause 6.
Fault tracing
 Warning messages generated by the drive
 Fault messages generated by the drive
Any failures of the Safe torque off function must be reported to ABB.
Warning Cause What to do
START INHIBI Safe torque off function has been
activated while the drive was stopped.
Close Safe torque off function switch. If the
switch is closed and the warning is still
active, check power supply at ASTO board
input terminals. Replace ASTO board.
Fault Cause What to do
GD
DISABLED X
ASTO board power supply of parallel-
connected R8i inverter module has been
switched off during run. X (1…12) refers
to inverter module number.
Check Safe torque off function circuit of this
module (X).
Replace ASTO board of R8i inverter
module.
START INHIBI Safe torque off has been activated during
motor run or motor start command has
been given when Safe torque off is
active.
Close Safe torque off function switch. If the
switch is closed and the fault is still active,
check power supply at ASTO board input
terminals. Replace ASTO board.

ABB ACS800-U1 Specifications

General

Brand	ABB
Model	ACS800-U1
Category	Controller
Language	English