97-7224006_3-31-15
Information subject to change
25
7224 OPERATOR’S MANUAL – SECTION 5
5.1.2
Remote Amplifier Status and Reset
Use a male, 25-pin D-Sub connector and high-
quality wire to build the circuit.
Figure 5.3
sche-
matic details the circuit and components required
for all status and reset functions.
Remote Signal of Over Temperature
Condition
Purpose:
LED, when lit, signals Over Temperature
condition.
Method:
Use a 6mA series resistor of 4.02 Kohm
for LED or OPTO, tie OverTemp Out (PIN 11) to
-24V source (PIN 13).
Signal Type:
DC
Level when Asserted:
–24V
Level when Deasserted:
0V
Note:
When amp is normal, this pin is pulled to
–24V through a 47.5K-ohm resistor; when amp is
in OverTemp state, transistor Q37 turns on and
sources chassis ground as an output. Do not ex-
ceed 20 milliamps.
An OverTemp condition will force the amp to
Standby. When the Standby Mode on Over Temp
option is enabled on the amplifier, a Reset com
-
mand must be triggered via the front-panel Reset
button or a remote amplifier Reset command. If
the Standby Mode on Over Temp is not enabled,
the amplifier will automatically move to Run when
temperature cools to operating levels.
Figure 5.3 – Remote Status and Reset Schematic
The SIM Interlock I/O Connector can be used to
create a circuit to monitor remotely one or more
amplifier conditions, including Run status, Over-
temperature, Overload and Overvoltage. The cir
-
cuit can also be constructed to allow remote reset
of the amplifier when it is forced to Standby due to
Over-temperature or Over-load conditions.
