Specifications

RMa750 Programming Definitions Monday, 10 July 2000
page 5
Remote Power Select.
Channel 15 is used to indicate to the system that the rear panel switch on the amplifier has been
engaged to enable remote power up / power down of the amplifier.
High = not selected / not enabled,
Low = selected / enabled.
This feature is powered by the Crestnet/AXlink network.
The switch on the back panel will do several functions.
1) It tells the system it is engaged
2) It will indicate on the front panel of the amplifier that it is engaged
3) routes the control system power to feed a relay that will act as the on/off switch.
The problem with remote on/off power is that when you are physically at the amplifier you may
want control of the amplifier and not to be locally locked out. If you have not enabled remote
power, the front panel on/off switch will work as normal. If remote power is enabled and the system
has switched the amplifier on, the front panel switch will not turn the amplifier off. If you require
the ability to turn the amplifier off locally then you will have to remove the data cable to the
amplifier or disengage the remote power switch.
Unit-Ready/On-Line
Channel 16 has been used to indicate to the system that the amplifier is powered up and ready for
operation. Low = ready for operation. High = powered down or not ready and thus any activity
from the amplifier’s CNPI/ CPI card should be ignored as the amplifier may be establishing itself
after its initial power up. High states can indicate mains failure to the amplifier due to a tripped
mains breaker or failed internal power supply etc.
To play safe once the system has detected a Unit-Ready/On-Line signal from the amplifier it should
do a momentary A.C. Fault Detect Reset (output channel 14). This removes the possibility of the
micro on the interface being latched/locked up, due to not being fully discharged (leakage from
control system) when the amplifier has been powered down.
Combinations of the Unit-Ready/On-Line state and the remote power enable will indicate whether
the amplifier has actually been turned off, has not been turned on or a failure has occurred.
Establishment.
The following is typical of the events as the amplifier powers up.
Inrush Current Suppression. 0.5 seconds
Speaker output relay closure 1 second
Amp Ready Indicator 3 seconds
Input Signal un-mute 4 seconds
Execution of micro Instructions 5 seconds
By the time the micro on the interface is ready to execute its instructions all operating aspects of the
amplifier have been fully established.