QM range App Note, document number 260283, rev 15
Page 21 of 48
YC Modules
The output voltage can be adjusted from the factory set point across the range
shown in the datasheet by performing the following operation:
Apply AC power
Individually adjust both potentiometers, situated to the right of the signal
connectors, so that the output voltage of each board assembly is 50% of
the desired output voltage. Turning the potentiometer clockwise increases
the output voltage.
Confirm that the module has the desired output voltage
The remote sense provides compensation for a maximum total load cable drop of 0.5V for the output. The
voltage at the output terminals must be within the specified adjustment range. Connect J1 Pin 8 to J2 Pin 7.
See the Remote Sense section in the POWER SUPPLY OPERATION chapter for connection advice.
Signals
The Module Good signal is an isolated (200V from the output) opto-coupler transistor output. The maximum
current allowed through the transistor is 1mA. This signal provides an indication that the output is above 90% of
the output set voltage. The transistor
is on when the output is “good”.
It is highly recommended to connect a 1uF 50V X7R ceramic capacitor between J1 Pin 3 and J2 Pin 4. This will
avoid a voltage spike / false triggering of the Module Good signal during turn on. This is due to the series
connection of the Module Good signals in the Y modules.
