Jands FP12 Manuale operativo - Pagina 13

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Fault Diagnosis

5.3

Phase fault indication

The three blue PHASE LEDs will show when all three power input phases are present.

IF ONE OR MORE PHASE LEDS IS OFF, IMMEDIATELY DISCONNECT

POWER TO THE DIMMER AND CHECK THE MAINS SUPPLIES AND

WIRING BEFORE RE-CONNECTING POWER TO THE DIMMER.

Although the dimmer will survive most power supply faults, indications of unusual or

potentially dangerous power conditions should never be ignored.

5.4

The FP12 dimmers feature temperature-controlled fan cooling. As the internal

temperature of the dimmer increases, the fan speed also increases.

The internal heatsink temperature is constantly monitored by the dimmer. If the heatsink

temperature rises above the specified maximum, the dimmer will automatically shut

down the output drive. The fan will continue to cool the heatsink during the shut down

period.

The electronic shutdown is backed up by a buried cutout, which shuts down power to all

electronics other than the cooling fan should the temperature continue to rise.

Even though the FP12 is a fan-cooled dimmer, it is very important that adequate

ventilation is provided when in use, particularly around the sides of the chassis. If air

circulation to the air vents is blocked and/or the ambient air temperature is too high, the

dimmer will shut down and the status LED will flash until the temperature is reduced.

Refer to section 6.1 Dimmer Ventilation regarding FP12 ventilation requirements.

5.5

The FP12 incorporates an over-voltage cutout that constantly monitors the incoming

mains voltage. If the mains voltage rises above the specified maximum the dimmer will

shut down and the status LED will flash until the over-voltage condition is removed.

Revision 0.1 – 3 June 1999

WARNING

FP12 DIMMER

5-2

USER MANUAL