Siemens Milltronics BW500, Operating Instructions Manual

Page: 102 / 220

Operation
8.6 Modes of Operation
BW500 and BW500/L
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Operating Instructions, 12/2016, A5E33482052-AD
8.6 Modes of Operation
RUN is the normal or reference mode of operation. It continuously processes the load and speed
signals from the belt scale to produce internal load, speed and rate signals, which are in turn
used as the basis for totalization, mA output, relay control, and communication data. The RUN
display is programmed (P081) to scroll through rate, totalization (P647), load and speed; either
manually by pressing the enter key, or automatically.
Rate
Total 1 Rate
Total 2 Load
Speed
If the BW500 is programmed for batch control, the batch display is added to the display scroll.
Refer to Batch Control (Page 176) for more information.
From the RUN mode, access to the PROGRAM mode, and zero and span calibration is made.
The PROGRAM mode allows viewing and, with security permission (P000), editing parameter
values. During PROGRAM, RUN mode functions are still active, that is.: rate, relay, mA output
and totalization.
If the PROGRAM mode is left idle for a period of ten minutes, it automatically reverts to 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.
8.7 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).
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).