ABB DCS8 Series, Original User Manual

Page: 13 / 20

13
Option description and instructions
3ADW00050Q957 Prevention of unexpected start-up en c
Use of the safety function
Activating
1.
Lock the POUS key switch. The switch locks in “ON” (open) position.
Resetting
1.
Unlock the POUS switch until it releases.
2.
Push the POUS reset button [S7x] (if installed). The indication lamp [P7x] goes out, the POUS
deactivates.
Note: You must push the reset button [S7x] for 0.1 to 3 seconds.
3.
Reset the drive if necessary.
4.
Make sure that the drive has received the start signal (depends on the configuration, see the
firmware manual).
5.
You can now restart the drive.
Note: You have to reset the POUS circuit with the reset button [S7x] also after you have powered up the
drive.
POUS indications
When the POUS is on:
−
the drive control program has the warning Safe torque off active,
−
the POUS indication lamp [P7x] is illuminated,
−
the mode LED of the safety relay [A65] is steady blue.
+Q957 Fault tracing
This table describes the status LEDs of the emergency stop safety relay [A65].
CH1 Mode CH2 Status Action
off off off The safety relay is not powered.
Check A1–A2 voltage and
connections.
green green green
CH1 and CH2 accepted. Reset made
and outputs activated.
off
flash
green
off
CH1 and CH2 unaccepted. A timer
function is counting down while the
safety relay remains activated.
off
flash
green
green
CH1 unaccepted and CH2 accepted.
A timer function is counting down
while the safety relay remains
activated.
green
flash
green
off
CH1 accepted and CH2 unaccepted.
A timer function is counting down
while the safety relay remains
activated.
off blue off No channels accepted. Check CH1 and CH2
off blue green CH1 unaccepted, CH2 accepted Check CH1
green blue off CH1 accepted, CH2 unaccepted Check CH2
green blue green
CH1 and CH2 accepted, the safety
relay waits for reset. Check reset settings, wiring
and reset/test circuit
green blue
fast flash
green
Two-channels error: CH2 has been
unaccepted and then accepted
again while CH1 remained accepted. Check installation. Restore by
opening and closing both
CH:s at the same time.