Alarm Operation - Oldham OLCT 200 User Manual

Figure 4-2: Cal-Mode Flow Chart and Menus

4.2 ALARM OPERATION

OLCT 200's have front panel LED indicators for Alarm 1, Alarm 2 and Alarm 3. An
optional 10-0234 Relay/Modbus board adds K1, K2 & K3 relays for these alarms.
CAUTION: OLCT 200 Alarm LED indicators function even without the presence of the
10-0234 Relay option. With 2-Wire 4-20mA and wireless operation, to conserve
power, alarm LED's only flash during alarm events. With 3-Wire 4-20mA operation,
alarm LED's flash when new, and become steady after an operator ACKNOWLEDGE -
pressing the UP/RESET key.
For OLCT 200 wireless models, "Low Battery" is indicated by an icon on the LCD and
by flashing the FAIL LED. ALL ALARM EVENTS EXCEPT FOR LOW BATTERY
INCREASE WIRELESS TRANSMISSIONS TO EVERY 6 SECONDS.
ALARM 3 – UNDERSTANDING FAULT / LEVEL OPERATION
4.2.1
The "A3" alarm is typically dedicated to FAULT conditions indicating sensor failures or
"out of measurement range" conditions. However, some applications require a third
level alarm. The A3 menu is identical to A1 & A2 and may be set to trip at an upscale
level value. A3 WILL ALSO TRIP WITH MISSING OR FAILED SENSORS
REGARDLESS OF THE LEVEL VALUE!
CAUTION: Missing or failed sensors always trip Alarm 3 (FAIL) and relay K3 (if
equipped). This is true even with A3 configured as a level alarm and it must be
accepted that A3 level alarm events might be caused by the monitored level, or, by a
missing or failed sensor. A3 and FAIL alarm conditions DO NOT cause the radio
transmission rate to increase to 6 seconds.
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