Sharp QT-80W Instruction Manual download pdf (Page 83)

Possible cause:

b) The temperatures at the measuring point on the ECG or at the cool

spot on the lamp(s) are exceeded (for a brief description of the

temperature at the ECG and lamp see end of text).

Remedy:

The luminaire or site of installation should be modified to ensure

that the maximum recommended temperature is not exceeded

even in onerous conditions circumstances (high ambient

temperature and/or high supply voltage).

8.5.4 Different brightness

levels

Problem:

Luminous output too low compared with other luminaires. Different

brightness levels for the two lamps in two-lamp luminaires. Different

brightness levels at the lamp ends

Possible cause:

a) Typical maintenance behaviour of a fluorescent lamp at the end of

its life

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:

b) Lamps of different wattages colour appearance or incorrect

wattage

Remedy:

The lamp wattage must match the wattage indicated on the ECG.

The colour appearande should be homogenous within an

application.

Possible cause:

c) Incorrect wiring between ECG and lamp (output terminals not used

or reversed; contact problems)

Remedy:

Check the lamp-side wiring for correct contact. Has the lamp

connection been wired according to the wiring diagram on the EG?

For two-lamp ECGs in particular, check that the common or

external connection is correctly wired. Pay particular attention in

the case of special combinations.

Possible cause:

d) Lamps are “force cooled” by draughts

Remedy:

Find the cause of the draught and either eliminate the draught or

protect the lamps accordingly.

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Sharp QT-80W Instruction Manual Page 83

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