22
isoUG425_D00220_02_Q_DEEN / 05.2018
Wiring diagram
The supply voltage
U
S
applied to A1 and A2 can be provided by the system
voltage L+ and L- only when the supply voltage is ≥ 24 V DC. Otherwise a se-
parate power supply is required. Connect terminals "A1" and "A2" to the sup-
ply voltage
U
s
according to IEC 60364-4-43, i.e. the connections are to be
protected against short circuit by means of a protective device (a 6 A fuse is
recommended). Devices for protection against short-circuit in conformity
with IEC 0100-430 for the connection of terminals L+/L- to the IT system to be
monitored can be omitted if the wiring is carried out in such a manner as to
reduce the risk of a short-circuit to a minimum.
CAUTION
Only one ISOMETER® may be controlled via an external Test/
Reset button. A galvanic parallel connection of several test or
reset inputs for testing multiple insulation monitoring
devices is not allowed.
L+
KE
14
24
11
K1
K2
E
T/R
Test/Reset
L
COM460IP
RS-485
L+
L-
PE
A
B
R
ON
T
R
MENU
AL1
AL2
k
<
k
ISOMETER
isoUG425
L+
L-
E
KE A1 A2
14
24
11
T/R
A
B
R
on
off
U
S
A1
A2
The supply voltage
U
s
applied
to A1/A2 can be provided by the
system voltage (L +/L-) when the
system voltage is ≥ 24V DC. Otherwise
a separate power supply is needed.
