Siemens SIWAREX WT241 Manual page 64

Scale parameters and functions of the belt scale
8.3 Menu 1.1 Basic parameters
1.1.2 Basic parameter 2 of 2
Belt length (1 com-
plete revolution)
Speed detection
Design / nominal
belt speed
Speed correction if
belt loaded (Band
beladen)
Load factor for
speed correction
Design speed
Belt revolutions for
calibration / zero
setting
Warm up time
Simulation mode
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The length of the conveyor belt is measured during commissioning, and
entered. This is usually twice the distance between the axes of the de-
flection pulleys plus the single circumference of the pulley. The input is
made in the length unit from the belt load.
There are three options for determining the current speed:
0 – no speed sensor present. Specification of a constant belt speed or
determination of it.
1 – speed sensor at digital input DI.0
2 – external specification of belt speed from PLC via Modbus RTU (see
chapter 11 "Communication", pg. 87.
The design speed can be determined with the belt empty. To this end,
the time for one or more belt revolutions is measured, and the speed
determined from this.
If a speed sensor is not used (speed detection = 0, see above), a speed
correction can be determined at a certain belt load factor (preferably the
nominal load) in addition to the design speed. A load-dependent charac-
teristic for the speed then results together with the design speed. This
characteristic is determined by two working points: Design speed with
empty belt and a speed factor correction with a certain belt load factor.
The specification is made in % of the design speed.
The associated belt load factor (in % of nominal load) is specified for
determination of the speed correction (see above)
The design speed can be determined with the belt empty. To this end,
the time for one or more belt revolutions is measured, and the speed
determined from this.
At least one belt revolution is required for the calibration. You can in-
crease the number of belt revolutions in order to increase the accuracy
of the equipment.
Following switching-on of the electronic weighing system, this input indi-
cates in the status area that the time has not yet expired ("Warm-up
time running").
The weighing electronic offers three modes of simulation:
1. Load simulation
2. Speed simulation
3. Load and speed simulation
Without enabling one of these modes within the basic parameters, a
simulation cannot be started.
In case one simulation mode is chosen, the menu "1.5.9 Simulation" will
get accessable.
SIWAREX WT241
Manual, 05/2015, A5E36046748A