Page 20 of 27 Filename: 7970H8
5. Front Panel Warning LED’s And Buttons
5.1. Front Panel Warning Lamps
Inhibit: When lit indicates that the channel indicated has had its output
relays inhibited by a setup or hold function. The inhibit function has a time
out on it and will clear automatically if not cleared manually after a period
that is factory set. All the other channels are being monitored and will
activate their appropriate relays.
To inhibit a channel, that is, disable the relays for a particular channel; the
user must press the UP button on the TQ4000 main board when the
CHANNEL LED is indicating the desired channel. The INHIBIT LED will
illuminate. To release the inhibit function the user must press the DOWN
button on the TQ4000 main board when the CHANNEL LED is indicating the
desired channel. The INHIBIT LED will switch off.
O/R: When lit this indicates that the sensor related to that channel has
gone over range. The fault relay will activate under this condition. The O/R
indication is latching and will require resetting by the reset button. If the
O/R has come on it is most prudent to check the functionality and
calibration of the sensor.
Fault: The channel indicated has displayed a fault and the fault relay should
also be activated.
AL1/AL2/AL3: The channel indicated has exceeded the alarm set point for
the alarm indicated. The appropriate relays should also have been
activated if not previously been inhibited.
Chan: Channel lamp shows the channel which is currently displayed on the
LCD, nominally five seconds per cycle.
Mains: Shows healthy mains status.
Watchdog: shows when the unit has had a catastrophic breakdown.
5.2. Front Panel Button Functions
5.2.1. Reset
The RESET button may be used to reset an alarm if the appropriate
alarm condition has cleared. If the BUZZER was activated, that is, not
previously muted, the RESET button will also de-activate the BUZZER.
The alarm LED’s will switch off and the relays will be reset.
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