Sequential Turn-On
Sequential Turn-On Operation
Black Max amplifiers contain a sequential turn-on feature that is designed to turn on a bank of Black Max amplifiers,
one at a time, in sequence with approximately
1
second between each amplifier. This type of sequencing of power
is necessary in large systems where the in-rush current of all the system amplifiers turning on at once would over-
load the AC mains supplying the system.
The first amplifier in the chain will act as the master amplifier controlling the power-up for the group. When it is
switched on, it will initiate the power-up sequence.
To prepare/wire multiple Black Max amplifiers for sequential turn-on operation, do the following:
Preparation & Wiring
Turn off all amplifiers and unplug from AC.
The amps should be wired together in a daisy chain fashion.
Wire the XMT connections of one amp to the RCV con-
nections of the next amp as shown in the diagram. This pat-
tern is continued until all the desired amplifiers are connect-
ed. The last amplifier in the chain has no connections on its
XMT terminals, and the first amplifier has no connection to
its RCV terminals.
Note:
The RCV and XMT terminals have both polarity and
number indicators. In daisy chaining the amplifiers, the same
connection pattern is used: Pin 4 ("+") XMT of the previous
amp to Pin 2 ("+") RCV of the next amp and Pin 3 ("-") XMT
of the previous amp to Pin
1
("-") RCV of the next amp.
Switch Settings
The position of the Power Sequencing Switch of the Black
Max is important in sequencing setup. The master amplifier’s
Power Sequencing Switch MUST be set to OFF. By setting
the switch to OFF, this amplifier will turn on and off direct-
ly by its front Power Switch. All other amplifiers in the chain
MUST have their Power Sequencing switches in the ON
position so that they respond to the sequencing signals. All
slave amplifiers MUST have their front Power Switch set to
the ON position, with the exception of the master amplifier.
To Begin the Power Up Sequence
Turn on the first amplifier in the chain. All others will fol-
low in sequence with a
1
second delay between them.
Power Down of Sequenced Amplifiers
When the first amplifier in the chain of sequenced amplifiers
is switched off, all other amplifiers will also switch off imme-
diately.
Troubleshooting Sequencing Problems
If an amplifier in the chain does not have its front Power Switch set to ON, it will not power up. However, all other
amps that follow that amplifier will continue to sequence. If an amplifier in the chain does not have its Power
Sequencing Switch in the ON position, it will break the daisy chain. It will, in effect, become a second master ampli-
fier controlling all amps that follow it. In this case, if the Power Switch for this amp is switched off, the sequencing
will stop at that amplifier. If this amplifier’s Power Sequencing Switch is set to ON, then all amplifiers following it
will have already begun to sequence.
Should an amplifier in the sequence shut off either by tripping its circuit breaker or by someone turning the Power
Switch OFF, only that amplifier will lose power. All units that follow will remain powered up. If however, AC power
is removed from an amplifier by unplugging the power cord, all other amps following it will immediately power
down. An amplifier in the chain going into or coming out of low-power sleep mode will have no effect on the group.
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Содержание Black Max X300
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