3.3 Electrical installation
CAUTION!
Pump can be damaged.
The panel plug on the housing can break off.
– Never connect a T-coupler directly to the
housing.
Only connect a cable directly to the housing.
CAUTION!
Pump can be damaged.
IP65 degree of protection cannot be guaranteed if
the CAN cable is not correctly screwed in.
– Manually screw in the CAN cable threaded
connectors until they reach the stop.
The following requirements apply for the connecting cables / the
Modbus interface:
n Half-duplex, 2-wire technology, “twisted pair” cable
n Max. cable length 1200 m
n RS-485 (TIA-485-A)
n Differential voltage level ± 5 V
n Active termination (terminating resistor)
If the Modbus pump is connected to the end of the
Modbus, the Modbus PCB's integrated terminating
resistor can be switched on via the metering
pump's menu - in this case, a separate terminating
resistor screwed to the end is obsolete.
Tab. 26: Connection assignment for Modbus RTU
Pin Lead colour PLC Programmable
Logic Controller ter‐
minal
1 - -
2 - -
3 blue GND
4 black A
5 grey B
Fig. 8: Socket assignment on the
pump
Fig. 9: Plug assignment on the CAN
cable
Supplementary Operating Instructions for Modbus RTU
42
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