Siemens Milltronics BW500, Operating Instructions Manual

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Parameters
12.2 Relay/Alarm Function (P100 - P117)
BW500 and BW500/L
160
Operating Instructions, 12/2016, A5E33482052-AD
12.2.5 P117 Relay Dead Band
Sets the dead band for the relay selected; BW500: relays 1 to 5 (P100 -01 to -05); BW500/ L:
relays 1 and 2 (P100 -01 to -02). 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, range is 1 to 10 %.
Note
Not applicable if P100 = 4, 7, or 8.
12.2.6 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
12.2.7 P119 Override
This function allows the user to simulate an alarm condition: ON or OFF, which will override
normal operation until P119 setting is returned to normal.
Values
P119 Condition Display (alarm field)
0 normal normal
1 alarm on ALM #
2 alarm off blank