ICS-6 Instruction Manual
01000-53-000
Page 36 of 42
Issue 11 19 January 2021
8
LED Indicators
'Interlock' LEDs
Two LED’s are provided for each of the four Interlock Monitors. Each pair refers to an interlock
switch or group of switches, depending on how the system has been wired up.
For each Interlock, a pair of yellow LEDs indicate that the interlock is open. The left-hand LED
indicates the ‘A’ contact, the right-hand LED indicates the ‘B’ contact. If the contact is not used and a
wire link has been fitted, the corresponding LED will not illuminate.
If both ‘A’ and ‘B’ contacts are fitted and it is observed that one LED is on and the other off, this
indicates a fault which will be detected by the mismatch detector if it is enabled. In this event
operation of the unit will be inhibited. Please see the ‘Mismatch Detector’ section.
‘EXPN’ LEDs
The ICS-6 may have one or more expansion boards fitted internally (see section 6), and the status of
the board(s) is indicated. The LED’s are illuminated yellow if an expansion board has opened the ICS-
6 safety circuits. The left-hand LED indicates the ‘A’ contact, the right-hand LED indicates the ‘B’
contact. The ICS-6 cannot be armed if either or both lights are lit.
These lights will also be lit if the Expansion Socket Terminator has not been fitted as described in
section 6.
If an expansion board is fitted these lights will illuminate briefly when the system is armed, as the
ICS-6 checks the operation of the expansion board.
'Safety Circuit Complete' LEDs
These LED’s will light green when both safety circuits are complete.
The system will not arm if either or both LED’s are unlit. This may be due to any of the following:
The 'Enable' key switch is set to ‘Disable’.
A door interlock switch is open, indicated by the ‘Interlock’ lights on the front panel.
The emergency stop switch (if present) is activated, indicated by the ‘Emergency Stop’ lights on the
front panel. Reset the switch to enable the system.
The system has been disabled by a master control switch or other remote system.
The expansion board, if fitted, is not ready, or the termination header has not been fitted.
The safety circuit is faulty.