Sharp QT-80W Instruction Manual download pdf (Page 82)

Possible cause:

f) Changeover times and voltage levels are outside recommended

tolerances for emergency lighting systems with changeover

between AC and DC

Remedy:

Measure the DC supply voltge and check the switchover

properties, or consult the equipment manufacturers.

Possible cause:

g) Non-sinusoidal mains voltage or DC voltage with high residual

ripple (e.g. operation with fully electronic leading edge phase

control dimmer switch or artificial mains network/emergency

generating set)

Remedy:

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

ECG and the wave form or residual ripple in DC operation is within

the specified limit values. Dimming is not recommended unless the

ECG is expressly approved for dimming, in which case the

prescribed controls (special accessories) must be used.

Possible cause:

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

8.5.3 Lamp goes out during

operation

Problem:

The lamp goes out during operation (at least one lamp in the case of two-

lamp units)

Possible cause:

a) The reversible protection device in the ECG has responded during

operation. The reason may be an intensive transient mains fault

(mains voltage falls below the minimum voltage specified on the

ECG for longer than permissible). Pulses of exceptional energy

(transients) are superimposed on the mains voltage. The value of

the mains voltage exceeds the maximum recommended value (e.g.

because of a fault in the supply unit). Slow increase in mains

voltage following neutral conductor break (unbalanced load,

depending, among other things, on the mains load).

Remedy:

Disconnect the ECG or luminaire from the mains then check the

supply voltage. If such problems occur sporadically, we

recommend recording the mains voltage and/or using an

oscilloscope or memory voltmeter. The electricity supplier may

have to be consulted. Make sure that the neutral conductor is

connected properly to this luminaire and makes good contact.

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Sharp QT-80W Instruction Manual Page 82

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