low, with a maximum sink current of 1mA; when no fault condition occurs, the PS_OK level is high with
mum source current of 2mA. The following faults will set the PS_OK to a Fault state:
*Enable/Disable open (Power supply is disabled)
Off, Power Supply is shut off)
*IEEE failure (With optional IEEE interface)
When turning On the power supply AC On/Off, it can start to its last setting of Output Voltage and Current with
restart mode) or start with the output Disabled (Safe
t mode). Press and hold the
OUT button to select between Safe
restart modes. The VOLTAGE display will continuously cycle
between “SAF” and “AU7” (“7” represents “T”) every 3 seconds. Releasing the OUT pushbutton while one of the
played, selects that mode. The default setting at shipment is Safe
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.
In this mode, the power supply restores its last operation setting and sets the Output to an Off state.
up, the output is Disabled and the Output Voltage and Current are zero. To Enable the output
and restore the last Output Vol
tage and Current values, momentarily press the OUT button.
5.12 OVER TEMPERATURE PROTECTON (OTP)
The OTP circuit shuts down the power supply before the internal components can exceed their safe
internal operating temperature. When an OTP shutdown occurs, t
he display shows “O7P” (“7” repr
sents “T”) and the ALARM LED blinks.
Resetting the OTP circuit can be automatic (non
latched) or manual (latched) depending on the
start mode, the power supply
stays Off after the over temperature co
dition has been removed. The display continues to show “O7P” and the ALARM LED continues to
blink. To reset the OTP circuit, press the OUT button (or send an OUT ON command via the serial
restart mode, the power supply recovers to its last setting automat
cally when the over temperature condition is removed.
The power supply is equipped with Last Setting Memory, which stores several power supply param
Output Voltage setting (PV setting)
Output Current setting (PC setting)
Remote/Local: If the last setting was Loca
l Lockout, (latched mode), the supply will return to R
Locked/Unlocked Front Panel (LFP/UFP)
(Items 8, 9, 10 are related to Remote Digital Control operation and are explained in Chapter 7)
