User manual

(5.0E) 2-3
CAUTION!
Version Fuse for inrush
current limiter
Fuse for
transformer
230 V 2 A Time Lag (T) 8 A Time Lag (T)
100 V 5 A Time Lag (T) 16 A Time Lag (T)
115/230 V 8 A Time Lag (T) 8 A Time Lag (T)
Mainframe fuses
2.4. Mains power inrush current limiter
The mains inrush current limiter ensures a slow "start-up" for the
mainframe and allows several mainframes connected to the same
mains supply circuit to be switched on together without temporarily
overloading the supply circuit. The inrush current at switch on is
limited to 5 A (10 A at 115 V and 100 V version).
Note that repeatedly and rapidly switching a mainframe on and
off will stress the inrush current limiter circuit - a rear panel fuse
protects the circuit from damage.
2.5. Fuses
Two fuse carriers are fitted on the mainframe rear panel - the
upper fuse protecting the mains power inrush current limiter and
the lower fuse for the mainframe power supply. If either fuse
should fail then the red LED (FAIL) indicator next to the respective
fuseholder will light.
If one of the fuses has failed disconnect the P1200A from the mains
supply before replacement. Only use a fuse of the correct type
and nominal current value. Both are 20 mm fuses, the values are
printed on the mainframe rear panel above the respective fuse
carrier. Before restoring power to the mainframe all cabling should
be checked for faults. If in any doubt disconnect all signal and
loudspeaker connections.
2.6. Remote control & monitoring
The P1200A is fitted with a remote interface for various levels of
remote control and system supervision of the mainframe and its
controller modules. The remote interface connection is opto-
coupled and floating.
Basic-Remote
The Basic Remote is the simplest way to implement a remote control
system. A mainframe can be remotely powered on by simply
applying an 18 - 28 VDC control voltage to the terminals of its
remote interface connector. Connecting a simple detector circuit to
the remote interface of a mainframe also allows remote warning of
a mainframe fault.
Details of basic circuits for remote power control and fault display
are published in d&b technical information bulletin TI 212,
available on request.
Control by the d&b Remote Interface Bridge (RIB)
The d&b RIB is a 19“ rack mount device, 1 rack unit high. Up to 12
mainframes (A1 or P1200A) or E-PACs at distances up to 500 m
(1650 ft) can each be directly connected via a twin wire to a RIB I/
O port. From the front panel of the RIB each device can then be
remotely powered on and off and its power and error status
monitored. A group of E-PACs or mainframes can be switched
directly by the RIB front panel MASTER ON/OFF switch or
remotely via a connection to an opto-coupled input port on the
rear panel of the RIB. Remote indication of the error status of a
mainframe group can also be relayed by the RIB.