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When the unit is shut-off by J1 signal, the VOLTAGE display will show "SO" to indicate the unit state. J1
contact 15 is the SO signal input and contacts 2 and 3, IF_COM, are the signal return (connected
internally). Contacts 2,3 and 15 are optically isolated from the power supply output.
The SO control logic can be selected by the rear panel SW1 Setup switch. Refer to Table 5-2 for SW1
setting and SO control logic.
SW1-5 setting
Down (default)
Up
5.8 ENABLE/DISABLE CONTROL VIA REAR PANEL J1 CONNECTOR
Contacts 1 and 14 of J1 (Fig.4-2, Item 5) serve as Output Enable/Disable terminals by switch or relay.
This function is enabled or disabled by the SW1 Setup switch position 9. Refer to Table 5-3 for
Enable/Disable function and SW1 setting.
SW1-9 setting
Enable/Disable inputs
Down (Default)
Up
To prevent possible damage to the unit, do not connect any of the
Enable/Disable inputs to the positive or negative output potential.
Safe Start mode-If the Enable/Disable fault condition clears when units in safe start mode
Auto Restart mode- The output will return back ON automatically when the Enable/Disable
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 10mA sink current.
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.
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
*OVP
*Foldback
*AC fail
SO signal level
J1-2(3), 15
2-15V or Open
0-0.6V or Short
2-15V or Open
0-0.6V or Short
Table 5-2: SO logic selection
Open or Short
Open
Short
Table 5-3: Enable/Disable function and SW1 setting
recovery is by pressing OUT button or by sending a 'OUT 1' serial command.
fault conditions clears.
*Enable/Disable open (Power supply is disabled)
*SO (Rear panel Shut-Off - Power supply is shut off))
*IEEE failure (with optional IEEE interface)
*Output Off
Power supply
output
On
Off
Off
On
Power supply output
On
Off
On
CAUTION
NOTE
CAUTION
37
Display
Voltage/Current
"SO"
"SO"
Voltage/Current
ALARM LED
Display
Voltage/Current
"ENA"
Voltage/Current
Off
Blinking
Off
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