Getting Started
5
Revision 1.0 - 7-May-02
HUB24 Series Dimmer
Operating Manual
3.4
Connecting loads
Power down the HUB24.
Plug in the loads to the Dimmer output sockets. It is recommended that, where practical,
the load on the dimmer outputs be evenly spread across the 15 channels. This will
minimise fan noise and make it harder to overload a single phase.
Ensure the load on each dimmer output is greater than the minimum (see section 5.7).
Plug in the loads to the Distribution output sockets. Each output must not be loaded
beyond the capacity of its socket.
3.5
Connecting DMX-512
The dimmer input signal should conform to the USITT DMX-512 (1990) specification.
See section 8.1 for connector wiring details.
The status of the DMX signal is indicated on the bottom of the display.
The DMX input to the HUB24 dimmers connects to the IN socket on the front panel.
The DMX signal may be daisy-chained to the next dimmer via the THRU socket. If the
THRU socket is not being used see section 4.2.3 for how to terminate the DMX
segment.
The two ISO sockets may be used to start two new fully isolated DMX segments, which
may be required for:
•
Isolating DMX segments that run to equipment that is powered from different
supplies.
•
Star DMX network topology.
•
Amplifying the DMX signal for extremely long cable runs.
•
Driving more than the normal maximum of 32 devices from a console.
3.6
Power-up sequence
When powering up, the following sequence should be used:
1. Power up the control desk.
2. Power up any softpatches and/or DMX receivers.
3. Ensure the dimmer RCDs and circuit breakers are switched on.
4. Power up the dimmers last, preferably one at a time starting from the first
dimmer rack in the DMX loop.
This procedure minimises the risk of lamps and fixtures responding to any false DMX
data produced by control desks or ancillary equipment at turn-on (producing the lighting
equivalent of an audio “thump”) and prevents damage to lamps, dimmers, and other
controlled devices.
Use the reverse procedure when powering down.
