Information subject to change
97-7796264_09-04-2020
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5
24
Remote Signal of Run Condition
Purpose:
LED, when lit, signals Run state.
Method:
Use a 6mA series resistor of 4.02K-ohm
for LED or OPTO, tie Run (PIN 12) to –24V source
(PIN 13).
Signal Type:
DC
Level when Asserted:
–24V
Level when Deasserted:
0V
Remote Signal of Overload Condition
Purpose:
LED, when lit, signals Overload condition.
Method:
Use a 6mA series resistor of 4.02K-ohm
for LED or OPTO, tie OverLoad Out (PIN 23) 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 Overload state, transistor Q36 turns on and
sources chassis ground as an output. Do not ex
-
ceed 20 milliamps.
An Overload condition will not place the amplifier
in Standby when operating with the factory de
-
fault settings. In order to clear the fault condition,
reduce the input levels until the Fault LED turns
off. However, if the Standby Mode on Overload
option is set, an Overload condition will force amp
to Standby. To return the amplifier to Run mode,
reduce the input signal level, then trigger a Reset
command using the front-panel Reset button or a
remote amplifier Reset command.
Remote Signal of OverVoltage Condition
Purpose:
LED, when lit, signals Overvoltage condition.
Method:
Use a 6mA series resistor of 4.02K-ohm
for LED or OPTO, tie OverVoltage Out (PIN 24) 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 Overvoltage state, transistor Q29 turns on
and sources chassis ground as an output. Do not
exceed 20 milliamps.
Reset from Standby
Purpose:
Switch, when thrown, returns amp to
Run condition after Overload conditions.
Method:
Use a dry-contact switch, voltage regula
-
tor (MC7915), and two 0.01/50V capacitors; wire
the circuit as shown (above). Assert 15V for at
least 100 ms to clear the error condition.
Signal Type:
DC
Level when Asserted:
–15V
Level when Deasserted:
0V
Note:
Tie to PIN 13 (–24V dc) and create a –15V
dc source; <2mA required for reset. Connect the
–15V dc source to PIN 25 (Reset) through a 1K
buffer resistor to reset.
Using the SIM-BNC Interlock connector located on
the back panel of the amplifier, you can remotely
Enable the amplifier and/or place the unit in Stand
-
by mode. See
Figure 5.4.
Remote Enable/Standby
Purpose:
Use a switch or optocoupler to remotely
disable the amplifier and place it in Standby mode.
Also, return the amplifier from Standby mode to the
Run condition.
Method:
Short PIN 4 of amplifier to Digital Ground
(PIN 17) using a dry contact switch or optocoupler.
In multi-amp applications, a switch can be used for
Parallel systems, but an optocoupler must be used
for Series systems. Multiple amplifiers (sharing
the same Sampled Common power connections)
can be simultaneously forced to Standby by daisy-
chaining Interlock (PIN 4) across amps.
Figure 5.4 – Remote Enable/Standby
5.1.3 Remote Enable/Standby
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