Operating Manual
ARS31(Pro)-UMB
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
16
5.2 Connections
5.2.1 Cable
See Section 3.3 Installation
– Connecting the cable
5.2.1.1 Power supply
The ARS31Pro-UMB/ARS31-UMB power supply is 24 VDC ± 10% (for a cable length up to
15 meters).
For cable lengths over 15 meters see table below. The supply voltage must not exceed the
value of 28 VDC.
cable lengths
[m]
recommended power supply
[VDC]
≤15
24
20
24,6
25
25,1
30
25,7
35
26,3
40
26,8
45
27,4
50
28
The power supply unit used must be approved for operating devices of protection class III
(SELV).
5.2.1.2 RS485 interface
The device has a half-duplex, 2-wire RS485 interface with the following settings:
Data bits:
8
Stop bit:
1
Parity:
none
Adjustable baud rates:
1200, 2400, 9600, 19200, 38400 (standard: 19200 bit/s)
Please do not change the baud rate of the sensor unless it is absolutely essential. If
the sensor is operated via ISOCON-UMB, the baud rate of the sensor must match the
set baud rate on the ISOCON-UMB.
The screened cable MUST be laid to ground in the control cabinet
If the device is not connected properly:
-
It may not function correctly
-
It may be permanently damaged
-
There is a danger of electric shock under certain circumstances
5.2.2 Connections in the housing
There is a single 4-pole terminal block on the underside of the plastic insert. This serves to
connect the power supply and the interface to the associated cable.
