AE Techron 7800 Series Operation Manual page 26

5.1.2 Remote Amplifier Status and Reset
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 system when it is forced to Standby
due to Overload conditions.
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
26
Figure 5.3 – Remote Status and Reset Schematic
Information subject to change
7800 SERIES OPERATION – SECTION 5
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.
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. The amplifier will automatically move to
Run when temperature cools to operating levels.
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