Connector Pin Assignment - Zenner WR3 Notice D'installation Et D'utilisation

Connector pin assignment

Temperature sensor
2-wire measurement:
Supply: 1 - 2
Return: 3 - 4
Flow sensor
Pulse: 10
GND: 11
Inputs/Outputs
I/O 1:
Pulse:
GND:
M-Bus
L1: 24
L2: 25
Depending on the meter's model the version of the connection board
can differ. If water meters with a potential free reed contact are con-
nected to the inputs the connection can be made in any direction. Take
care of the polarity when connecting to a BMS. The connectors 24/25 are
given twice for the incoming and outgoing of the M-Bus wire.
2 4 2 4
Switch for 2-wire measure-
ment (left position) and 4-wire
measurement (right position)
Connection 2-wire
Connection 4-wire
Important note for pure cooling meter calculators (only valid for Germany):
The temperature sensor on terminal 1/2 (or 1/2 and 5/6) must be installed in the
cold flow, the temperature sensor on terminal 3/4 (or 3/4 and 7/8) in the cold re-
turn. The display for the temperature difference on the display (see page 26) must
have a negative sign when the system is running normally.
4-wire measurement (optionally):
Supply:
Return:
I/O 2:
52
53
RS-232
DTR: 71
GND: 72
Tx: 73
Rx: 74
1 1 2 2 3 3 4 4
1 – 2 / 5 – 6
3 – 4 / 7 – 8
Pulse:
GND:
RS-485
+UB: 71
GND: 72
A: 73
B: 74
10 11 10 11 9 50 51 52 53 54 55 9 50 51 52 53 54 55
54
55
71 72 73 74 71 72 73 74
19