Jands HUB 24, Руководство по эксплуатации

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22 Fault Diagnostics
Operating Manual HUB24 Series Dimmer
5.4 DMX faults
Loss of DMX signal will be indicated by “ – NO DMX – ” displayed at the bottom of
the main screen. When DMX signal is lost, the dimmer will respond as configured until
a new DMX signal is provided, or a Snapshot or Chase function is selected. See section
4.2.4 for configuring “Loss of DMX Signal”.
Control consoles, when powered down, may transmit spurious DMX data which can
unintentionally cause dimmer channels to turn on. Because of this, after 10 minutes of
no DMX signal the HUB24 will turn off all channels that were under DMX control.
The HUB24 is protected against internal damage from most high voltage faults on any
of the DMX lines. Note that the protection circuitry may take up to a minute to reset
after a fault is removed from a DMX line.
5.5 Phase fault indication
The three coloured Phase LEDs, located on the left of the display, will light when all
three mains phases are present.
Phase A = Red
Phase B = White
Phase C = Blue
WARNING
IF ONE OR MORE PHASE LEDS ARE OFF, IMMEDIATELY DISCONNECT
POWER TO THE DIMMER AND CHECK THE MAINS SUPPLIES AND
WIRING BEFORE RE-CONNECTING POWER.
5.6 Cold lamp filaments
Cold lamp filaments consume considerably more power than warm filaments. This
means that when a lamp is flashed to full, the surge current can be much greater than the
rated current for the lamp.
The cold surge current to large lamps may be enough to trip the output circuit breakers.
If such nuisance-tripping of the circuit breakers occurs, the filament maybe preheated
using the control desk or programming a snapshot.
Preheating is turning a channel on a very small amount (around 1%) which heats the
lamp filaments and increases their electrical resistance. The lamp filaments may show a
barely perceptible dull red glow. When the lamp is then turned on full, the surge current
is much less and the circuit breaker is less likely to trip.
Other advantages of preheating lamps are an increase in lamp life (due to the reduction
of thermal shock to the filaments) and a reduction of lamp heat up time (the lamps will
flash to full slightly faster).
5.7 Output minimum loads
The HUB24 dimmer outputs will correctly control all resistive and mains-voltage
incandescent loads down to 60 watts and transformer-driven incandescent lamps (eg.
pinspots and low voltage halogen lamps) down to 100 watts.
The dimmer outputs will also control the speed of most "universal" motors, however
some motors will require a lamp plugged in parallel.