EDS470 - Bender

System c omponents
The insulation fault system is started by a potential-free NO contact on the
insulation monitoring device. The following functions are possible in this case,
depending on the particular connection:
• Connection of the NO contact (21/24) to terminals GND an IN1 :
the insulation fault location runs as long as the contact is closed. After
every pass of the system, there is a pause of 5 minutes during which the
insulation monitoring device can record new measurement values.
Alarm relay
Insulation Monitoring Device
11
21
GND
1 run 1 run
PGH471
12
14
22 24
IN1
pause 5 min
• Connection of the potential-free NO contact to terminals GND and IN2 :
The insulation fault location is started for one pass after which it is
stopped. To be able to start the EDS system again, the input must be
closed for approximately 6 seconds.
• Connection of the NO contact (21/22) to terminals GND and IN3 :
Suppression of the test cycle. No test cycle is emitted. This function is
required if the insulation fault location system is monitoring several IT
systems, and is being controlled centrally by one PRC470. In this case, a
test cycle can only be emitted by the PGH471 insulation fault test device
in the IT system where the insulation fault has occurred.
Note: this kind of connection only makes sense in coupled IT systems.
DIP switch PGH471
SLAVE ADDRESS + 110
25mA A3 A2 A1 A0 SLAVE
1
0
10mA
MASTER
Setting of the max.
test current (25 mA
resp. 10 mA)
Setting of MASTER or
SLAVE mode
Address setting in SLAVE
mode
Note: black = switch position
TGH 1243E/02.2000
16