Electrical Connections; Environmental Conditions; Ingress Protection - Mettler Toledo WMS Manual De Usuario

4 Operation

4.1 Electrical connections

WMS weigh modules have a standard RS232C and RS422 interface for the communication with the
control systems.
Interface descriptions
Interface type
Interface update rate (max.)
Power supply for the weigh module
Input voltage
Use a stable power supply with no voltage fluctuations.
•
If voltage fluctuations cannot be prevented, use a voltage regulator to deliver a constant voltage
•
value to the load cell.
The power supply must be approved by the respective national test center of the country in which
•
the weigh module will be used.

4.2 Environmental conditions

WMS weigh modules can be operated within the following environmental conditions:
Temperature Range
Relative air humidity
Height above mean sea level
Warm-up time

4.3 Ingress protection

IP rating of the WMS weigh modules:
IP54: when weighing (protected with double-labyrinth).
IP66: when cleaning wash-down (seal activated with 1 bar air pressure).
Weigh Modules
RS232C, bidirectional, full duplex
RS422, bidirectional, full duplex, bus-capable
92 weight values per second
12 to 24 V DC nominal (10 - 29 V DC)
Operating /
Compensated
Allowable ambient
+10 ... +30 °C
+5 ... +40 °C
Max. 80% at 31 °C, decreasing linearly to 50% at
40 °C, non-condensing
Max. 4'000 m (13'330 ft)
At least 30 minutes after the weigh module has
been connected to the mains.
Operation 9