Hella Induperm CCR 961-SW4.00, Руководство пользователя

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CCR961 MANUAL-GB
51
Version B2:01-07-2015
8 Maintenance and Trouble shooting
8.1 Regularly Control
There is no direct demand for certain maintenance to be done on the CCR, but in the following is
given a few recommendations, which could improve both MTBF, lifetime of the equipment as
well as safety for maintenance personnel.
Every 2. Year:

The series circuit is disconnected from the CCR and the series circuit isolation is measured
(Megger). The value is compared with the latest measured value in the CCR.

The CCR includes supervision of the series circuit current, Imin (open circuit) and Imax (most
likely thyristor failure). These function is not often in use and can be tested as follows:
o
The current in the lowest intensity step is adjusted to 1,0 A, Switch on in step three,
wait some seconds and then switch to step one. The CCR must switch-off with Imin
alarm within 1 sec.
o
The Imax alarm is adjusted to 5,1A. The CCR is switched on in the lowest step, wait
some seconds and the switch to the highest step. The CCR must switch-off with Imax
alarm within app. 4 sec.
Every 5 years:

The CCR is cleaned inside with a vacuum cleaner (CCR CUBICLE IS POWERED OFF!),
and all components are visually controlled for changes in color etc.

All power connections are controlled by means of a Thermo camera.
8.2 Safety instructions
Before any service work is done in the CCR cubicle, the power supply must be switched off.
If measurement have to be done with power on, the measurement must be via a measuring
transformer.
Remember, that ISO measurement on the series circuit is performed with 500VDC, and a good
circuit is like a capacitor, and can keep the voltage long after power is removed, therefor always
ground the series circuit.
Before any work is done on the series circuit:

The key selector on the CCR is set to “OFF”

The cut-out is activated (FAA plugs to ground or Cut-out selector to “Cut-Out”)

The CCR front door is clearly marked with a sign “Work is done on the series circuit”