Power Supply Ok Signal - Agilent Technologies N8700 User Manual

3 Operating the Power Supply Locally

Power Supply OK Signal

Daisy-Chained Output Shut-down
POWER SUPPLY
J1-2,3 J1-16
Com
46
The Power Supply OK signal on the J1 connector indicates a fault
condition in the power supply. J1 pin 16 is a TTL output signal. Pins
2 and 3, which are connected internally, are the signal common. All
pins are optically isolated from the power supply output. With no
fault, Power Supply OK is high, with a maximum source current of
2mA. When a fault occurs, Power Supply OK is low, with a maximum
sink current of 1mA. The following faults set this signal low:
Over-voltage protection
Over-current protection
Over-temperature protection
AC line failure
It is possible to configure a multiple power supply system to shut
down all the units when a fault condition occurs in one of the units.
SW1 setup switch 5 must be in the Down position to enable the daisy-
chain operation. Other switches are unaffected by this setting.
If a fault occurs in one unit, its Power Supply OK signal is set low and
its display will indicate the fault. The other units shut off with their
displays indicating SO. When the fault condition is cleared, all units
will recover according to their Safe-Start or Auto-Restart settings.
The following figure shows three units daisy-chained - the same
connection method can be used with additional units. The Shut Off
and Power Supply OK signals are referenced to Chassis Common (J1
pins 2 and 3).
1
#
J1-15 J1-2,3
Supply OK Shut Off
POWER SUPPLY
2
#
J1-16 J1-15
Com Supply OK Shut Off
Enable/Disable signal true
Shut Off signal true
Remote interface failure
Output turned off
POWER SUPPLY
#3
J1-2,3 J1-16 J1-15
Com Supply OK
Series N8700 User's Guide
Shut Off