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When the unit is shut-off by a 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 in-
ternally). 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
Down (Default)
Up
Safe Start mode-If the Enable/Disable fault condition clears when units in safe start mode recov-
ery is by pressing OUT button or by sending an 'OUT 1' serial command. Auto Restart mode-
The output will return back ON automatically when the Enable/Disable fault conditions clears.
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, the CV/CC signal output
is low (0-0.6), with maximum 10mA sink current.
Do not connect the CV/CC signal to a voltage source higher than 30VDC. Always
connect the CV/CC signal to voltage source with a series resistor to limit the sink
current to less than 10mA.
5.10 PS_OK SIGNAL
The PS_OK signal indicates the fault condition of the power supply. PS_OK is a TTL signal output at J1-16, refer-
enced to IF_COM at J1-2, 3 (Isolated Interface Common). When a fault condition occurs, the PS_OK level is low,
with a maximum sink current of 1mA; when no fault condition occurs, the PS_OK level is high with a maximum
source current of 2mA. The following faults will set the PS_OK to a Fault state:
*OTP
*Enable/Disable open (Power supply is disabled)
*OVP
*SO (Rear panel Shut-Off, Power Supply is shut off)
*Foldback
*IEEE failure (With optional IEEE interface)
*AC fail
*Output Off
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
Enable/Disable Inputs
Open or Short
Open
Short
Table 5-3: Enable/Disable function and SW1 setting
To prevent possible damage to the unit, do not connect any of the
Enable/Disable inputs to the positive or negative output potential.
Power supply
output
On
Off
Off
On
Power supply output
On
Off
On
CAUTION
NOTE
CAUTION
37
83-507-013 Rev. A
Display
Voltage/Current
"SO"
"SO"
Voltage/Current
Display
ALARM LED
Voltage/Current
"ENA"
Voltage/Current
Off
Blinking
Off
.
The
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