CCR961 MANUAL-GB
10
Version B2:01-07-2015
The Supervision system
A number of vital parameters are constantly supervised, and one or two alarms can be
generated for each of the following parameters.
o
Current in the series circuit:
If the current drops below a certain (adjustable) limit, the series circuit must be
open. This is dangerous for the maintenance people, and therefore the CCR are
switched-off and an I-min alarm is displayed in the menu and send to the remote
control system.
If the current exceeds a certain (adjustable) limit, a CCR failure is properly at hand.
This is dangerous for the lamps, and therefore the CCR is switched-off and an I-
max is displayed in the menu and send to the remote control system.
o
Isolation failure:
The CCR can be programmed to continuously ISO measurement or to interval
measurements. By interval measurements, the interval between the measurements
can be adjusted between 1 to 99 hours.
A measuring voltage (500VDC) is connected between the series circuit and ground
through a special measuring box. The resulting DC current can be used to calculate
the isolation level. Isolation values between 0
and 2M
are displayed in 11
bands (fx. 50K
- 100K
). Two alarm levels can be set.
ISO Measuring principle
