34
5.9.
CV/CC SIGNAL
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 J1-13, referenced to the COM
potential at J1-12 (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 10mAsink current.
5.10.
PS_OK SIGNAL
PS_OK signal indicates fault condition in the power supply. PS_OK is a TTL signal output at J1-16,
referenced to IF_COM at J1-2,3 (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. The following faults will set the PS_OK to Fault state:
*OTP
*Enable/Disable open
*OVP *SO (Rear panel Shut-Off)
*Foldback *IEEE failure (with optional IEEE interface)
*AC fail *Output Off
5.11.
SAFE START AND AUTO-RESTART MODES
When turning on the power supply AC On/Off, it can start to its last setting of Output Voltage and
Current limit with the output enabled (Auto-restart) or start with the output disabled (Safe mode).
Press and hold the OUTPUT button to select between Safe start and Auto-restart modes. The
VOLTAGE display will continuously cycle between "SAF" and "AUT" every 3 seconds. Releasing
OUTPUT pushbutton while one of the modes is displayed, selects that mode. The default setting at
shipment is Safe mode.
5.11.1 Automatic start mode
In this mode, the power supply restores its last operation setting. Upon start-up, the output is
enabled or disabled according to its last setting.
5.11.2 Safe start mode
In this mode, the power supply restores its last operation setting and sets the Output to off state.
At start-up, the output is disabled and the output voltage and current are zero. To enable the
output and restore the last output voltage and current limit values, momentarily press OUTPUT
button.
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.
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