RELAY OUTPUT
The BW100 offers one single pole double throw (SPDT) relay that can be assigned
(P100) to one of the following alarm functions:
» rate: relay alarms on high and/or low material flow rate.
» auto zero: relay alarms when an attempted auto zero calibration
reports an out of range condition (E9).
» speed: relay alarms on high and/or low belt speed.
» load: relay alarms on high and or low belt load.
» error: relay alarms on any error condition as it is reported.
Refer to Appendices \ Troubleshooting.
Except for alarm on ‘auto zero’ and ‘error’, the high and low alarm setpoints (P101 and
P102 respectively) are required and must be entered in the appropriate units.
The on / off actuation at both setpoints is buffered by the damping (P080) and the
programmable dead band (P117), to prevent relay chatter due to fluctuations. The
relay is normally energized; i.e. the normally closed (n.c.) contact held open. Upon an
alarm condition, the relay is de-energized and the alarm icon on the BW100 display
appears. Once in alarm, the relay and icon remain in alarm status until the alarm
condition is removed.
Example:
P014 = 2m/s, design speed
P100 = 3, belt speed
P101 = 100% (2m/s)
97/07/07
high
100%
low
20%
actual ‘off ’
22%
actual ‘on’
20%
alarm ‘on’ is with relay de-energized
OPERATION
PL-531 51
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