IRDH275BM-7_D00123_07_M_XXEN / 08/2020 15
ISOMETER® IRDH275BM-7
11
Serial interface RS-485 (termination 120 Ω resistor)
12
Alarm relay 1; changeover contacts provided
13
Alarm relay 2 (system fault relay); changeover contacts provided
14
Connection of the coupling device AGH675S-7 to the converter: connect the high voltage cable encapsulated on one end to the
mid-point of the DC intermediate circuit.
Connection of the two coupling devices AGH675S-7MV15 to the converter: connect the high voltage cable encapsulated on L+ and
L-.
i
Connect the terminals A1/+ and A2/- to the supply voltage U
s
in accordance with IEC 60364-4-43.
The connections to the supply voltage shall be provided with protective devices to afford protection
in the event of a short circuit (a 6 A fuse is recommended).
For UL and CSA applications, the use of 5 A fuses is mandatory.
i
Only one ISOMETER® may be connected to an external TEST or RESET button. The TEST and RESET
button for collective testing of several insulation monitoring devices must not be connected in paral-
lel. External coupling device connected via the terminal AK cannot be switched off via the internal
coupling relays.
