Rockwell Automation T82xx Trusted High Integrity Power Supply 110-240V ac and 24V dc - Manual (Page 10)

Trusted
TM
Power Supply System T82xx
Issue 9 Mar 06 PD-T82xx 10
Note: Bulk Power Fail, PFC Off and Remote Off are accessed through the monitor module connector
on the chassis backplane. The monitor module connector allows for a future development of a
monitor card that would provide remote control and enhanced monitoring of the power supply
chassis.
Active low signals are not maintained while RESET is active. All status signals are open collector and
require external pull-up resistors.
RESET is used in the Regent I/O transceivers for power system interlocking within the I/O system. A
power failure (either input power or module fault) activates RESET and turns off the dc output front
panel indicator.
The POWER FAIL and RESET signals are required for proper operation of Regent I/O transceivers
and I/O modules during power up, power down, and loss of power. Refer to Assembly Installation in
the associated Regent Product Description for details of connecting these signals to a Regent I/O
chassis.
•
• Input power failure - Active low status output. Indicates when the input voltage is below
85 V ac or 18 V dc . There is a separate signal for each input.
• Bulk power failure - Active high status output on ac input modules only. Indicates the dc bulk
voltage (PFC output) is outside the specified range. There is a separate signal for each input.
• High-temperature warning alarm - Both an active high and active low status output are
provided. Indicates the module temperature exceeds 75
°
C. The temperature is sensed near
the air inlet (bottom) of the module.
• High-temperature shutdown - Internal signal that will shut down the switching regulator if
module temperature is above 85
°
C. The temperature is sensed near the air inlet (bottom) of
the module.
• Output over-voltage - Internal signal that will shut down the switching regulator if the output
voltage exceeds +18 V dc for the 15 volt module and +28 V dc for the 24 volt module. Over-
voltage protection circuitry activation is a permanent error condition, requiring manual
intervention to return module to normal operation.
• dc output fail - Active high status output indicates the dc output voltage has gone out of
regulation. The dc output fail threshold is 13.75 V dc (
±
0.25 V dc ) for the 15 volt module, and
21.75 V dc (
±
0.25 V dc ) for the 24 volt module.
• Output current limiting - Internal signal limits output current in excessive current demand
situations.
• POWER FAIL - Active high status signal that indicates impending loss of output power due to
one of the following:
• - Both inputs have indicated power failure
• - Remote off control signal activated
• - Thermal shutdown
• - Output-over voltage
• RESET - Active high status signal that is generated a minimum of 10 ms (ac input module) or
0.5ms (dc input module) after a POWER FAIL signal. RESET remains asserted for 200ms
(minimum) after module power-up.
• PFC off - Active low input that turns off the power factor correction of an individual input. This
signal provides the capability to test the input circuitry of a module by turning off each input
independently while monitoring the module fail signal
• Remote off - Active low input that turns off the output power of a module.