Page 92 Accumass BW500 PL-565
Operation
The on / off actuation at both high and low 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; holding the normally open (n.o.) contact
closed (can be programmed for reverse operation, P118). Upon an alarm condition,
the relay is de-energized and the relay contact is opened. Once in alarm, the relay
remains in alarm state until the alarm condition is removed.
Example:
P014 = 2m/s, design speed
P100 = 3, belt speed
P101 = 100% (2 m/s)
P102 = 20% (0.4 m/s)
P117 = 2% (0.04 m/s)
alarm `on' is with relay de-energized
Totalization
The totalization function is based on the internal rate (mass per unit time) signal
proportional to belt speed and load on the associated belt scale. It is not affected by
the damping function (P080). The rate signal is sampled several times a second to
accurately count the mass of material conveyed. The count is held in the master
totalizer used to increment the internal totalizers and to produce a pulse signal for the
remote totalizers.
The BW500 provides several separate totalizer functions:
Internal totalizers:
• local display (totalizers 1 and 2)
• verification totalizer (totalizer 3)
• material test totalizer (totalizer 4)
• batch total (totalizer 5)
External totalizers
• totalizer outputs (remote totalizers 1 and 2)
high
100%
low
20%
actual low alarm
‘off’ = 22%
‘on’ = 20%
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