MAINTENANCE AND FAULT FINDING
L025317 Issue 1 March 2011 5-9
564 TRIAC shorted The safety circuit
triac or the by-pass
relay is short circuit
Contact Domino.
565 TRIAC not
working
The safety circuit
triac is open circuit so
mains power cannot
be applied to the
safety relay.
Contact Domino.
The unit is working in a
failsafe mode now.
566 Bypass relay not
working
There is no AC mains
after the By-Pass
relay.
Contact Domino
567 Laser Cooling
Fault
Wrong frequency
from fans/water
turbines to DSP.
Check all fans or water
turbines are connected and
working.
573 External 12/24V
missing
The 12/24V interface
power is missing.
Check PSU and connections,
disconnect external devices.
574 Extension 24V
Supply missing
The 24V supply is
missing in the
controller.
Look for a short circuit or
other problem in the extension
power supply.
575 Safety Relay Fault The safety relay did
not close when reset.
Furthermore if
ONLY one of two
interlocks was opened
and closed again and
then a laser start
command was set,
this status is shown as
the safety relay
MUST fail.
Open BOTH circuits to reset
this state.The malfunction may
be caused not only by a broken
safety relay but also by
malfunction of the D550+
power extension box i.e. its
safety-power contactors, or
missing the control
interconnection cable.
576 Positive scanner
power missing
The +15V scanner
supply is missing in
the cabinet.
Check the power supply rails
on test points and on the user
interface diagnostics.
577 Negative scanner
power missing
The -15V scanner
supply is missing in
the cabinet.
Check the power supply rails
on test points and on the user
interface diagnostics.
578 System Standby The keyswitch is at
position 1 but not yet
set by turning the
keyswitch or remote
start.
Turn the keyswitch to start
position, or give a remote start
input, or press the "Start"
button on the user interface.
Status Message Cause Suggested Action
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