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Control panel of the earth-leakage-guard (optional):
1 Power on control (green)
2 Signals exceeding dielectric resistance (yellow)
3 Signals exceeding temperature (yellow)
4 Reset-button for fault release
5 Test-button starting self-test function manually
3.6.2 Application requirements
The earth-leakage-guard monitors the dielectric resistance for equipment (where safety
isolation is necessary) which are connected to the isolation transformers. Simultaneously,
the temperature of the transformer is evaluated by a built-in thermal switch which responds
when triggered. The evaluation procedure is processor controlled.
3.6.3 Application requirements
Turn the main power switch of the isolating transformer to “ON”. Within 5 s the self-test of the ELG
is automatically activated. After the self-test of the ELG is concluded, the green LED (Power on
control) glows permanently. During operation this test is repeated (automatically) in a time cycle of
8 hours. This self-test may also be activated manually through the test-button.
The control procedure for the manual self-test is as follows:
• An insulation error is simulated, the yellow LED (signals exceeding dielectric resistance)
glows, a warn signal (2.4 kHz) is activated. Both signals stop after approx. 5 s.
• Following this, a temperature error is simulated. The yellow LED (signals exceeding
temperature) glows, a warn signal (2.4 kHz pulse tone) is activated. Both signals stop after
approx. 5 s.
An error situation is recognized as follows:
• In case of an insulation error, the yellow LED (signals exceeding dielectric resistance)
glows permanently, the warn signal with 2.4 kHz is activated permanently. The warn signal
can be deactivated through the reset-button for fault release. The LED glows until the error
is
eliminated.
• If the earth-leakage-guard is turned “OFF” in the meantime and the error is not eliminated,
when turning the ELG back “ON” the above described procedure begins anew.
With the occurrence of an isolation error the acoustic and optical alarm stays activated
(even if the isolation error is corrected on its own) until deactivated through the fault release:
First activation of the fault release: acoustic alarm is deactivated
Second activation of the fault release: optical alarm is deactivated
ELECTRICAL SAFETY
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