Sharp QT-80W Instruction Manual download pdf (Page 80)

mercury available to generate UV radiation.

This can be remedied by installing a thermal tube in the luminaire. The

effect always or nearly always occurs in the area of the luminaire where the

ECG is not located. This is due to the power loss of the ECG side of the

lumiaire will always be slightly warmer for the same reason.

Caution: Mercury depletion leads to a reduction in lamp voltage and to an

increase in discharge current. This may result in damage to the

ECG or, in extreme cases to failure of the ECG.

8.5 Trouble Shooting

8.5.1 Lamp does not start Problem:

Lamp does not start (with two-lamp ECGs both lamps fail to start), no

visible glow shortly after start-up. Same behaviour even after being off for 1

minute (internal reset) and restart.

Possible cause:

a) RSD or other protective device in the installation has operated

Remedy:

Check the wiring on the mains side or insulation resistance. Has the

max. recommended number of ECGs on one phase in a 3-phase

system been exceeded= Make sure that the neutral conductor is

connected properly to all the luminaires and makes good contact.

Check that moisture has not penetrated the luminaire?

Possible cause:

b) Fault in the wiring on the mains side

Remedy:

Check whether the mains voltage is in the required range for the

ECG. Make sure that the neutral conductor is connected properly

to all the luminaires and makes good contact. Check that the

cables sit correctly in the terminals.

Possible cause:

c) At least one lamp has reached the end of its life owing to a cathode

break or increase in lamp voltage.

Remedy:

Replace the lamp (for two-lamp ECGs we recommend replacing

both lamps at the same time to keep maintenance time and costs

to a minimum).

Possible cause:

d) The “fail-safe” overload protection device in the ECG has

responded (the ECG is permanently damaged)

Remedy:

Check whether the lamp(s) operate at other positions. If not, check

whether the mains voltage is within the permissible range. Make

sure that the neutral conductor is connected properly to all the l

uminaires and makes good contact. Replace the ECG and lamp.

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Sharp QT-80W Instruction Manual Page 80

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