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The self-monitoring system is capable of identifying any possible first failure the moment it
occurs and switching off the downstream relays. Failure to detect a fault is therefore
impossible.
The self-monitoring is a periodic overall test of the device and takes place every 2sec as a fully
automatic process. This test is a background job and only an error detection will be displayed.
Because of this special first failure safe design manual tests are not necessary so there are no
test switches on the SMLC2..
4.2 LED-Display
Permanent green LED: normal operating mode
Flashing green LED (1 Hz): low voltage
Permanent red LED:
Level has been below electrode for more than 4 (8, 12, 16)
sec. Returns to normal operating mode, if electrode is
longer than 2 sec in water again.
Flashing red LED for 4..16s (1 Hz):
Resistance of insulation electrode below threshold for >
5 sec.
Subsequently: permanent red LED.
Returns to normal operating mode, if resistance of insulation
electrode above threshold again.
Insulation electrode
stained
Permanent red and yellow LEDs:
RAM/ROM/CPU test faulty; 2
nd
processor does not answer.
Return to normal operation mode if failure corrected.
permanent red LED together with flashing (1 Hz) yellow
LED:
Short circuit or cable break.
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