OPERATION
© 2014 Mold-Masters (2007) Limited. All Rights Reserved.
Revised 1 Oct, 2014
6-20
6.14.4 Beacon and Sounder extension
A Beacon and Sounder extends any second stage temperature alarm
or fatal error alarm. Curing the alarm condition automatically extin-
guishes the beacon/sounder.
A key switch is also provided to mute the sounder at any time. Note
however, that no reminder is given to show that the sounder is muted
when the system is healthy. Re-occurrence of subsequent alarm con-
ditions will cause the beacon to light but not create an accompanying
audible alarm.
6.15 Card Indicators
Heater Control Cards also have their own LED indicators that give
a state-of-health display and which can be seen through the cabinet
windows.
SCAN – this LED ashes briey as the controller interrogates each
card in sequence.
FUSE – Should normally be extinguished. It lights to show that an
output fuse has failed.
TC – Should be normally extinguished. It lights to show that the card
has detected an open-circuit fault on the thermocouple circuit.
GF – Should be normally extinguished. It lights to show that the card
has detected a ground fault on one of the zones controlled by this
card.
LOAD (L1 to L2/L6) - The Load LED(s) should also be normally
lit, and a pulsing appearance shows that there is a regulated supply
being delivered to the load.
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