Commissioning flow chart (in three parts)
23
isoLR275_D00127_00_M_XXEN/07.2018
The encircled figures in the flow chart correspond to the figures in the legend
to the wiring diagram.
Commissioning of the ISOMETER® (1)
7
Is the system to be monitored an
unearthed system (IT system)?
isoLR is not suitable for this
application( contact Bender)
Device connection
Optional device
connection
no
no
yes
The terminals AK1 and AK2 must be
connected by means of an AGH-LR
to Un of the system to be monitored
An external k
Ω
measuring instrument
at M+/M-
Scale centre point: 28 k
Ω
or 120 k
Ω
Output current: 0/4...20 mA
Connect the supply voltage Us
to the terminals A1/+ and A2/-. Consider
the details indicated on the nameplate.
External TEST button (NO contact)
to the terminals T1 and T2
External RESET button (NC contact)
to the terminals R1 and R2
The output contacts of the alarm relays
System fault (21-22-24)
Alarm 1 (11-12-14)
Alarm 2 (21-22-24)
When using the RS485 interface, take
care that a 120
Ω
resistor is connected
at the beginning and the end of the
network.
13
12
11
8
10
Deenergize the installation
before connecting the device!
Recommended wire cross
section of connecting cable
single wire 0.2...4 mm2
flexible 0.2... 2.5 mm2
Is the maximum nominal voltage
Un ≤ AC 793 V
and is Un ≤ DC 1100 V
yes
The two PE connections
and KE
must be connected separately to the
equipotential bonding.
6
2
3
4
5
1
isoLR is not suitable for this
application( contact Bender)
