3 Installation
page
16
ELC N6_N10-V3.1-09/11-GB subject to technical alterations
3.4.5 Earth fault control
The ELC (electronic ballast) has been fitted with an earth fault control system.
The ELC is fitted with an earth fault relay
ES
for the purpose of indicating an earth fault.
During trouble-free operation the relay is closed (provided the ELC is connected to the power
supply voltage).
The earth fault control is also active when the lamp is switched off.
The lamp should not be switched on is the relay ES is open.
La
m
p
R_
err
or
ES
Control
8
13
Fig. 8: Earth Fault Control
In the case of an earth fault via the isolating resistor
R_
error
(see Fig. 8) the relay
ES
opens .
The error is only displayed, the ELC does not switch
off the lamp. The error is also not stored by the ELC.
In order for the earth fault control to function properly
it is essential that it be connected as prescribed,
particularly the earth connectors.
The relay contact ES (pins 8 and 13 on the control
connector) opens when the isolation resistance
R_
error
drops below approx. 200 kOhm.
If an earth fault occurs during lamp operation we recommend shutting down the
installation rapidly and correcting the error. The lamp must not be started if
earth fault has occurred.
In order to avoid an unwanted reaction of the earth fault control during faultless
operation, the isolation resistance of the lamp cables and all lamp connectors
must be greater than 10 Mohm
.
If the release relay RELEASE (s. 3.4.1) is open the earth fault relay ES will not
give clear information! In this case an error message “earth fault“ should not be
issued.