5
5) SW2 is used to enable or disable the converter.
For
positive
logic module, When SW2 is put in the ON position, the converter is ON and
when SW2 is put in the OFF position, the converter is OFF.
For
negative
logic module, When SW2 is put in the OFF position, the converter is ON, and
when SW2 is put in the ON position, the converter is OFF.
6) SW3 is used for the Output Voltage Set-Point Adjustment Range.
By an external voltage source:
If the converter requires a trim up, set the
SW3_1
to ON position.
If the converter requires a trim down, set the
SW3_2
to ON position.
By an external resistor:
If the converter requires a trim up to Vo,set, set the
SW3_8
to ON position.
If the converter requires a margin trim down, set the
SW3_3
to ON position.
If the converter requires a margin trim up, set the
SW3_4
to ON position.
Please refer to the SW3 Function table.
SW3 Function table
Subdivide switch No.
Function
SW3_1
Voltage trim up
SW3_2
Voltage trim down
SW3_3
Resistor margin trim down
SW3_4
Resistor margin trim up
SW3_8
Resistor trim up
Note:
1. The subdivide switch of SW3_1~4 must not be
ON
at the same time.
2. For the SW3_5~7 use at NPA series, must set to OFF position.
7.2 Initial Power Up
1) Turn the power supply ON, set the current limit on DC source (refer to specification of
either converter) and increase the input voltage (use DVM2 to monitor the input voltage)
until it reaches the desired value.
2) Set the switch SW2 to power module ON.
3) The converter is now operating, which can be verified by observing the DVM3 (appropriate
value for the nominal output voltage) and channel 2 of the oscilloscope (appropriate value
for the nominal output voltage).
4) Set the switch SW2 to power module OFF.