Engcon DC2 QSC - Page 67

8 Troubleshooting
Symbol
Indication
Description
Action
Steady light (both)
Machine lock is active. Coil is
energised.
Extinguished (both)
Machine lock is inactive.
Left indicator
flashes at 10 times
per second
(10 Hz)
The hook sensor indicates it is
‘not coupled’. Takes priority over
steady light.
Insecure coupling
Automatic when both sensors
indicate the same state, ‘coupled’
or ‘not coupled’.
Right indicator
flashes 10 times
per second
(10 Hz)
Ejector sensor indicates that it is
‘not coupled’. Takes priority over
steady light.
Insecure coupling
Automatic when both sensors
indicate the same state, ‘coupled’
or ‘not coupled’.
Both flash once per
second
(1 Hz)
Process fault in machine lock
sensors. The machine lock has
been activated and deactivated
without any of the sensors having
indicated ‘not hitched’.
One of the machine lock sensors
indicates ‘not coupled’.
Cause: The sensors have been
disconnected or have a damaged
cable.
Constant light
Tiltrotator lock is selected via
configuration.
Extinguished
Tiltrotator lock is deselected via
configuration. The lock will not be
activated.
Fast
Flashes 10 times
per second
(10 Hz)
Activated 1: Excess current
on the tiltrotator lock valve
(has priority over open load).
More than 3500 mA passes to
activated tiltrotator lock valve.
The output will be turned off.
Activated 2: One of the tiltrotator
lock outputs is short-circuited
either to earth or system voltage
while the tiltrotator lock is turned
off.
Confirmation 1: Automatic if less
than 3500 mA passes through
the tiltrotator lock valve when it is
reactivated.
Confirmation 2: When the system
is restarted.
Slow
Flashes 1 time per
second
(1 Hz)
Open load on tiltrotator lock
valve. The current is less than
200 mA when the tiltrotator lock
is activated.
Automatic when more than 200
mA passes through the tiltrotator
lock valve when it is activated.
Steady light (both)
Tiltrotator lock is active.
Extinguished (both)
Tiltrotator lock is inactive.
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