Page 90
Accumass BW500
PL-565
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The program mode allows viewing and, with security permission (P000), editing
parameter values. During program, run mode functions are still active, i.e.: rate, relay,
mA output and totalization.
If the program mode is left idle for a period of ten minutes, it automatically reverts to
the run mode.
Zero and span calibrations effectively halt the run mode while they are in progress.
During this time, totalization ceases, and all mA outputs, except for PID, fall to zero.
Damping
Damping (P080) provides control over the speed at which the displayed readings and
output functions respond to changes in their respective input function; load, speed
and the internal rate signals. Changes in the displayed rate of material flow, material
loading and belt speed are controlled by the damping. Relay alarm functions based
on input functions of rate, load and speed, respond to the damped value.
Damping consists of a first order filter applied to the signal (reading or output value),
so long as the change in signal is within
±
10% of the established reference value. If
the signal deviation is greater than 10% of the reference value, the signal will jump
immediately to that new value. This value will be the new reference.
For example:
A conveyor is running material at 3 t/hr. The damping value, P080 = 3, keeps the
reading and associated output stable over the normal operating fluctuation; i.e. the
rate varies within the filters active band, 2.7 and 3.3 t/hr. If the feed to the conveyor
suffered a blockage and the rate dropped to 1.5 t/hr, the damping would be bypassed
and the readings and output would immediately jump to correspond to the 1.5 t/hr
rate, and establish a reference value of 1.5 t/hr. The active damping band is now set
to
±
10% about the 1.5 t/hr value, or 1.35 to 1.65 t/hr. If the blockage cleared itself
slowly, i.e. the rate of increase was within the 10% active damping band; the rate
readings and output would gradually increase at the damped value. The 10% band
would continuously reestablish a new reference value as the rate of material
progressed.
If mA damping (P220) is enabled (value other than 0), then the damping (P080)
as it
pertains to the mA function
is overridden, and responds independently at the
specified mA output damping rate (P220).
Note:
Damping (P080 or P220) is not applicable to the mA output when programmed for
PID function (P201 = 4).
Summary of Contents for ACCUMASS BW500
Page 1: ...ACCUMASS BW500 Instruction Manual PL 565 January 2001 CCUMASS BW500 33455650 Rev 1 2...
Page 6: ...Page 6 Accumass BW500 PL 565...
Page 12: ...Page 12 Accumass BW500 PL 565 Specifications...
Page 28: ...Page 28 Accumass BW500 PL 565 Installation...
Page 88: ...Page 88 Accumass BW500 PL 565 Parameters...
Page 94: ...Page 94 Accumass BW500 PL 565 Operation...
Page 106: ...Page 106 Accumass BW500 PL 565 PID Control...
Page 110: ...Page 110 Accumass BW500 PL 565 Batching...
Page 112: ...Page 112 Accumass BW500 PL 565 Certification...
