58
83503001 Rev G
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
Power supply
output
Display ALARM LED
Down (Default) Open or Short On Voltage/Current Off
Open Off “ENA” Blinking
Up
Short On Voltage/Current Off
Table 5-3: Enable/Disable Function and SW1 Setting
CAUTION
To prevent possible damage to the unit, do not connect any of the
Enable/Disable inputs to the positive or negative output potential.
NOTE
Safe Start mode-If the Enable/Disable fault condition clears when units in safe
start mode recovery 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. The 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.
CAUTION
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, referenced 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
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