ICS-6-OEM Instruction Manual
01807-53-000
Page 27 of 32
Issue 5 19 January 2021
‘Mismatch Fault’ LED
If the system is wired as a fully dual-channel system, the Mismatch Detector is usually enabled as
described in section 7.
The ICS-6-OEM continually monitors both safety circuits. If a mismatch occurs that lasts for more
than about a second, the Mismatch Detector is triggered, which disables the system and illuminates
a red ‘Mismatch Flt’ light on the front panel.
The Mismatch Detector also monitors the internal relays of the controller and the safety proving
contacts of external equipment such as dual shutters, contactors, etc.
Site-specific procedures may be applicable in such an event, which cover actions to be taken to
determine the cause of the fault, to have it rectified and to restore the system to operation. There
may also be procedures to allow operation in degraded mode until normal operation can be
restored.
Section 7 describes the mismatch detector and how it is reset.
‘System Armed’ LEDs
When the 'Safety Loop Complete' LEDs are lit and the external Arm contacts have been closed, the
'System Armed' LEDs will light orange to warn that the ICS-6-OEM has enabled the laser. If the
‘Safety Loop Complete’ LEDs are illuminated but the ‘System Armed’ LEDs do not illuminate when
the external Arm contacts are closed, this could indicate that the internal checking circuitry of the
ICS-6-OEM has detected a fault condition.
