PL-565 Accumass BW500 Page 63
Parameters
P107 Relay Alarms
Sets the alarm mode for the relay selected, relays 1 to 5 (P100 - 01 to – 05
Entry:
1 = high and low
f
2 = high only
3 = low only
Note:
Not applicable if P100 = 4, 5, 6, 7 or 8.
P117 Relay Dead Band
Sets the dead band for the relay selected, relays 1 to 5 (P100 - 01 to – 05). The dead
band prevents relay chatter due to fluctuations at the high or low setpoint. (f=3.0)
enter the value in % of full scale, or for deviation alarm enter % of setpoint
Note:
Not applicable if P100 = 4, 7 or 8.
P118 Relay Logic
Sets the logic applied to relays to determine their open or closed state.
Power Failure
The relays on the BW500 default to normally open under power loss.
Normal Operation
In software, all relays are programmed the same way; with ‘on’ setpoints always
indicating relay action. This parameter allows the reversal of the operation. Normally,
P118 = 2 for each relay.
Reverse Operation
When P118 = 3, the operation of the indexed relay is reverse from normal.
Values
P118 Logic Relay
2 positive logic
normally closed
f
3 negative logic normally open
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