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MBZ-00001-01
2.3.2.3
Current Overload
The module is protected from current overload (short circuit) by a voltage fold-back
method. If the load on the output starts drawing more than 35A (approximately), the
output voltage will start decreasing. The power supply recovers automatically when the
load is removed or returns to normal.
Caution:
If the over-current condition lasts more than 30 seconds the power supply
may be damaged.
2.3.2.4
Over-temperature
Over-temperature will cause the module to shut down. Sensors monitor the tempera-
ture on the power transistors and power diodes. If over-temperature shutdown occurs,
switch OFF the input voltage and eliminate the cause of the overheating. Allow the
power supply to cool down to normal working temperature before switching it back
ON.
Correct mounting of the T809-10 power supply is important. For ventilation
Caution:
guidelines, refer to Section 3.9 (Power Supply Cooling and Derating). Ignor-
ing these conditions may cause the module to overheat and consequently
shut down.
2.3.3
Remote Sense
The remote sense function enables the power supply to adjust its output to compensate
for voltage drop lost along the cables to the load. Connecting the remote sense allows
the power supply to maintain a 13.8V
ter).
This feature is accessible on the auxiliary input connector (9-way D-range) on the rear
panel of the T809-10. For more information, refer to Section 3.5 (Remote Sense).
2.3.4
Remote Control
The output voltage of the PSU module can be remotely controlled (ON/OFF) by apply-
ing a DC control voltage across the remote control input terminals. The remote control
input circuit is optically isolated from the rest of the PSU circuit.
This feature is accessible on the auxiliary input connector (9-way D-range) on the rear
panel of the T809-10. For more information, refer to Section 3.6 (Remote Control).
2.3.5
Output Voltage Adjust
If it is not possible or desirable to use the remote sense feature to maintain the required
Copyright © 2004 Tait Electronics Ltd
Power Supply Description
at the load terminals (for example, a transmit-
DC
17
November 2004
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