TAVRIDA ELECTRIC ISM_LD Series, Application Manual

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Operating test
While testing the functionality, at first the ISM must be separated from high voltage.
· Turn on the CM auxiliary power supply and check the following operating indications:
- The POWER LED must light up immediately.
- The READY LED must blink during charging of capacitors and light up continuously within 10 s
- The READY relay contact must close within 10 s.
- The MALFUNCTION LED must not light up.
· Check of all basic and extended functions (if any) according to the chapters “Switching and Control Functions” and
“Signalling”.
· During operation both CM close / trip outputs and internal auxiliary
voltage for ISM auxiliary switch S13 can equal or exceed 230 V DC.
· After switching off the CM, there is still a voltage at the terminals of the capacitors. Only after the
MALFUNCTION-LED is extinguished has the voltage dropped to a safe value.
In the factory the magnetic actuator coils are connected and tested according to the existing circuit diagram. If
the actuator coil is connected with reversed polarity it is possible that the first operations cannot be performed
successfully. This is no failure of the ISM and after a few switching operations this possible effect disappeared
permanently (unless the polarity is changed again).
After above listed functionality tests were performed succesfully the ISM can be tested under high voltage and with
load connected.
Maintenance
Under normal operating conditions (see chapter “Regulations and Ambient conditions”, page 64) the ISM is
maintenance free for a period of at least 25 years or until it has reached the permissible number of operating cycles.
Nevertheless the surface of the ISM must be kept clean. Deposits of any kind must be removed.
Non-conformity
If during installation, commissioning, operation or maintenance any non-conformity occurs, action shall be taken in
accordance with the non-conformity report on page 69.
Caution
Danger!
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