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65
NATIONAL
INSTRUMENTS
5.6 Daisy-Chain Connection
It is possible to configure a multiple power supply system to shut down all units when a fault
condition occurs in one of the units. When the fault is removed, the system recovers according to
a preset state: Safe start mode or Automatic restart.
Set signal ” SO ” to positive logic via Front panel (refer to section 5.7.1) . If a fault occurs in one of
the units it’s ”PS_OK” signal will be set to low level and the display will indicate the fault. The other
units will shut off and their displays will indicate ”
SO ”. When the fault condition is removed, the
units will recover to their last setting according to their respective Safe start or Auto-restart setting.
Fig.5-6 shows connection of three units, however the same connection method applies to systems
with more units.
Fig.5-6: Daisy-Chain connection
P O W E R S UP P L Y
#1
J 3-7 J 3-2 J 3-5
IF C _C O M P S _O K
S O
P O W E R S UP P L Y
#2
J 3-7 J 3-2 J 3-5
IF C _C O M P S _O K
S O
P O W E R S UP P L Y
#3
J 3-7 J 3-2 J 3-5
IF C _C O M P S _O K
S O
5.7 Rear Panel (J3 Connector) Functions and Settings
Subsystem
Level
Display
Function
Level
Display Parameter Level Display Description
Rear Panel R.AN
Interlock IC
Enable (ON) ON
Enable/Disable
interlock
function (Analog
ON/OFF)
Disable (OFF)
OFF
Shut OFF SO
Positive OS
Positive (polarity)
same as PS_OK
signal
Negative NEG
Programmed
PIN 1
in1
High Hi
Open collector
Low
o
Programmed
PIN 2
in2
High Hi
Open collector
Low o
Table 5-3: Rear panel subsystem menu