Allen&Heath GL4000 SERVICE MANUAL - Manual (Page 105)

RPSD2 & RPSD APPLICATION
RPSD2 & RPSD
DUAL SUPPLY COMBINER / MONITOR
PSU2
PSU1
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MAINS
DC
MAINS
DC
DC CONSOLE
RPSD2 or RPSD MAINS >
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The RPSD2 & RPSD have been designed to compliment the professional series of Allen & Heath Live sound
mixing consoles. Its purpose is to monitor the power supply to the console and let a backup supply quickly and
silently take over in the event of a fault occuring on one of the supplies. Both units come in a compact 1U rack
mount module. The narrow front panel solely serves as an indicator panel as there are no other user controls.
Although the RPSD is primarily intended to operate with the GL4 range of consoles and the RPSD2 is intended
to operate with the GL4000 range, both are capable of operating with the entire range of A&H G-Series
consoles, provided the correct interconnecting cables are used. (see accessories in Specification section). The
RPSD2 & RPSD have been designed to operate with the following range of A&H power supplies: MPS8&9,
RPS5B, RPS9, RPS10 and RPS11. Please note, that when connecting the RPS11 to an RPSD a special
interconnecting cable (A&H part no: 002-225) will be required. The RPSD2 & RPSD can also be used in studio
and broadcast environments - whatever the console or application.
Connecting the RPSD2 or RPSD into a system only requires the replugging of the mains and DC leads. Each
support power supply derives its mains voltage from the RPSD2 or RPSD using the leads provided. We do
not supply the mains lead from the wall socket outlet to the RPSD2 or RPSD as this should already have been
provided with the original console power supply. The DC output from each power supply plugs directly into
the RPSD2 or RPSD which in turn connects to the console through the standard DC power cable provided.
Longer lengths should be used with care to avoid external interference pick-up and also the inherent voltage
drop caused by the cable resistance.
Each monitor circuit in the RPSD2 & RPSD is independently self powered by the power supply it is monitoring.
This allows the system to operate with just one supply connected, which can be useful if one has been removed
for repair or routine maintainance. As the RPSD2 & RPSD do not take power from the mains, both are
therefore compatible with all mains voltages from 100V to 240V AC. Make sure of course that both power
supplies are set to match the local AC mains supply.
Both the RPSD2 & RPSD include an RFI suppression filter on the mains input socket to remove unwanted
line interference. A front panel mains switch switches mains through a protection fuse to the 2 IEC outlets that
feed the two power supplies. A neon lamp indicates the presence of mains voltage.
As well as monitoring all the DC power rails (+16V, -16V, +48V) the RPSD2 & RPSD also provide built-
in reverse voltage protection to prevent damage to the console circuits if an incorrectly wired power supply
or DC cable is connected.
Each DC rail is continuously monitored for under voltage, over voltage and excessive ripple.
Large 3 colour front panel LED indicators quickly draw attention to the status of each supply. The operator
can see at a glance if anything is wrong. Remember this will occasionally be necessary because when a failure
occurs, the change over from one supply to another will go unnoticed.
The LED indicator status follows a logical error pattern. All indicator LEDs steady green signifies that both
supplies are working correctly. If a main STATUS indicator LED starts flashing red a supply has gone out
of voltage range. The faulty supply is indicated by a red rail LED. If a main STATUS indicator LED flashes
orange then excessive ripple on a supply has been detected. The faulty supply rail LED will also turn orange.
If the LED is permanently off then the supply is either disconnected, switched off or totally dead.