Communication
11.5 Calibration procedure
SIWAREX WT241
108 Manual, 05/2015, A5E36046748A
11.5 Calibration procedure
11.5.1 General information
Switch service mode on in order to carry out the calibration (service commands in
SIWATOOL, or command code "1" from SIMATIC/Modbus).
Certain basic parameters must be entered prior to calibration of the belt scale. These
include:
● Regulation code if the scale requires verification
● Unit for the belt load
● Unit for the flow rate
● Design flow rate
● Weigh length
● Total length of conveyor belt
● Speed sensor (pulse sensor) yes/no
● Test weight or chain load if a chain is used for the calibration
Two measurements are important when commissioning the belt scale:
● The speed measurement
● The gravimetric weight measurement (or measurement of the belt load)
All results of the calibration are initially presented by the SIWAREX module in DR4. You can
apply the results into the parameter set, or reject them. This guarantees that the individual
calibration steps do not change the existing parameter set and become effective
immediately.
When calibrating the scale, you can switch off the totalizer using command 652 "Stop
totalizing". All totalizers apart from totalizer 6 are then stopped.
Carrying out the calibration
Prior to the calibration, the belt should be in operation for a minimum time (usually 30
minutes) in order to permit it to reach its rated operating conditions.
During initial commissioning, measurement of the speed is calibrated first. Calibration of the
speed can be carried out for scales with or without a speed sensor. This is followed by
calibration of the weight measurement – the span calibration.
11.5.2 Calibration of the speed
Procedure in three steps
Calibrate the speed using the following steps:
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