Instructions

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5.7.4 Power Supply OK Signal
PS_OK signal indicates fault condition in the power supply. It is a TTL signal output at J3-2,
referenced to IFC_COM at J3-7 (Isolated Interface Common). When a fault condition occurs, PS_OK
level is low, with maximum sink current of 1mA. When no fault condition occurs, PS_OK level is
high with maximum source current of 2mA. All conditions when output status is disabled sets
PS_OK to low level.
The PS_OK signal at high level can be delayed via Front panel setting or software. This function
is used to prevent signal rise before output reaches set value.
PS_OK delay setting:
1. Press MENU button. MENU (GREEN) LED illuminates. The ”r
. AN” message appears on the
Current display.
2. Press Current encoder, ”I C ” message appears on the Voltage Display.
3. Rotate Voltage encoder until ”Sd” message appears and press Encoder.
4. Parameter delay time in mSec appears on the Current display
5. Rotate the Current encoder to adjust the setting level. PS_OK delay range is from 0 to 9999mSec.
6. Press Current encoder to select desired level.
7. Press MENU button twice to return display to it’s previous state. MENU LED turns OFF.
5.8 Rear Panel (J1 Connector) Functions
5.8.1 CV/CC Signal
The CV/CC signal indicates the operating mode of the power supply. Constant Voltage or Constant
Current. CV/CC signal is an open collector output with a 30V parallel zener, at J1-8, referenced to
the COM at J1-7 (connected internally to the negative sense potential). When the power supply
operates in Constant Voltage mode, CV/CC output is open. When the power supply operates in
Constant Current mode, CV/CC signal output is low (0-0.6), with maximum 10mA sink current.
CAUTION:
Do not connect CV/CC signal to a voltage source higher than 30VDC. Always connect CV/CC signal
to the voltage source with a series resistor to limit the sink current to less than 10mA.