Laser Jailer Maintenance Manual
00892-53-000
Page 11 of 16
Issue 2 30 January 2020
Fault Latch Reset
In the event of a fault the system should be properly investigated and repaired (see ‘Fault Location’
below) before the fault latch is reset. Once the repair has been effected the fault latch may be reset
by various means depending on system configuration. As this is a dual-channel system the fault latch
controls are duplicated.
1.
Turn the system power off for ten seconds, then back on again. This method offers the least
resistance to abuse and is not generally recommended.
2.
Internal reset. The ICS panel is opened and a pair of Fault Reset buttons on the Monitoring
and Detection circuit are pressed.
3.
Keyswitch reset. A key-operated switch may be provided to reset the fault latch.
Jumper links are provided on the Monitor and Detection board to configure the operation of the
Fault latch as follows:
J8, J9 Enable Fault Latch. The latch is disabled if the links are removed.
J10, J11 Auto Fault Reset. If the links are fitted the latch can be reset by cycling the system power as
described above.
If an external keyswitch or other control is provided to reset the latch it is connected in place of the
jumpers on J10 and J11 and it should connect each pair of pins together momentarily to clear the
latch.
5.3 Real Time Fault Indications
When a fault occurs and the Monitor and Detection board sets its Fault latch, the board is held in
‘Run’ mode and does not enter Test mode regardless of the state of the interlock controller. This is
so that the indication lights on the board or on the front panel of the interlock controller may be
used to show the status of the system in real time. When the Fault Latch is set, the interlock
controller is disabled.
When both ‘Leakage’ and both ‘Loop Open’ lights are off the system should be OK. Any of these
lights illuminated at the same time as the Laser Jailer Fault light shows that the fault is still present.
