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:
•
auto zero: relay alarms when an attempted auto zero calibration reports an out of
range condition (E9).
•
speed:
•
load:
•
error:
Troubleshooting
•
Refer to
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)
2 m/s
0.4 m/s
Page 44
relay alarms on high and/or low material flow rate.
relay alarms on high and/or low belt speed.
relay alarms on high and or low belt load.
relay alarms on any error condition as it is reported.
, page 65.
Milltronics BW100 - INSTRUCTION MANUAL
high
100%
low
2%
20%
alarm ON is with relay de-energized
actual OFF
22%
actual ON
20%
7ML19985DJ01