P117 Relay Dead Band; P118 Relay Logic; P119 Override - Siemens Milltronics BW500 Operating Instructions Manual

Parameters
12.2 Relay/Alarm Function (P100 - P117)
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 (
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
2
3
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
0
1
2
160
f
= 3.0).
Logic
positive logic
negative logic
Condition
normal
alarm on
alarm off
Relay
normally closed
normally open
Display (alarm field)
normal
ALM #
blank
BW500 and BW500/L
Operating Instructions, 12/2016, A5E33482052-AD
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