15
TGH1266E -
05/04
Product Description
Test Device PGH185
PGH185
100mA
10mA
25mA
Imax
ON
ON
Us
L1(+)
L2(-)
L3
AC/DC
solid casing with grip
ON/OFF switch
eurosocket for cold
conditions
Fuse 100 mA
socket for PE-
connection
3 sockets for coupling to the
electrical system
Display-LEDs:
ON
Operating-LED
indicates positive test cycle
indicates negative test cycle
selection switch
for max. test
current
(25 / 10 mA)
Not visible:
magnetic adhesive strip on
the rear side of the housing
to fasten onto metal parts
(switch cabinet).
The PG185 is activated by using its ON/OFF switch, and it generates a defined test current signal.
The voltage present in the system is used to drive the test current. The value of the test current which
is generated therefore depends on the value of the insulation fault that is present, and on the system
voltage. The test current is limited to a maximum of 25 mA, or to 10 mA when the switch is in
the 10 mA position. The test current flows from the system via the PGH185 and then through the
protective conductor (PE) and the insulation fault (or faults) back into the system. The test current
signal is registered by the clamp-on probes or measuring current transformers located in the fault
current circuit, and the sections affected by faults are displayed by the EDS165 insulation fault
evaluators whenever the operating threshold of 5 mA is exceeded.
If the PGH185 is active, the cycle LEDs light up alternately in time with the test cycle.
If the device is connected by terminals L1, L2, L3 (or L1, L2) to a system that is ‘live’ for operational
reasons the terminal must not be disconnected from the protective conductor (PE).
The test current flows between the
system and earth. If unfavourable combinations of
circumstances arise (low-impedance
insulation fault in combination with the test cycle),
control errors cannot be ruled out on very sensitive system components (SPC, miniature relays).
This possibility should be taken into account prior to use. If this possibility exists, then setting I
max
= 10 mA should be selected.
