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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 with the output Enabled (Auto-restart mode) or start with the output
Disabled (Safe-start mode). Press and hold the OUT button to select between Safe-start
and Auto-restart modes. The VOLTAGE dis
play will continuously cycle between “SAF” and
“AUT” (AU7) every 3 seconds. Releasing the OUT pushbutton while one of the modes is
displayed, selects that mode. The default setting at shipment is Safe-start mode.
5.11.1 Auto-Restart 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
an 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 values,
momentarily press the OUT button.
5.12 Over Temperature Protection (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, the display
shows
“OTP” (O7P) and the ALARM LED blinks.
Resetting the OTP circuit can be automatic (non-latched) or manual (latched) depending on
the Safe-start or Auto-restart mode.
1.
Safe-start mode:
In Safe-start mode, the power supply stays Off after the over
temperature condition has been removed. The display continues to show
“OTP” (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 port).
2.
Auto-restart mode:
In Auto-restart mode, the power supply recovers to its last setting
automatically when the over temperature condition is removed.
5.13 Last Setting Memory
The power supply is equipped with Last Setting Memory, which stores several power supply
parameters at each AC turn-off sequence.
STORED PARAMETERS:
1. OUT On or Off
2. Output Voltage setting (PV setting)
3. Output Current setting (PC setting)
4. OVP level
5. UVL level
6. FOLD setting
7. Start-up mode (Safe-start or Auto-restart)
8. Remote/Local: If the last setting was Local Lockout, (latched mode), the supply will
return to Remote mode (non-latched).
9. Address setting
10. Baud rate
11. Locked/Unlocked Front Panel (LFP/UFP)
12. Master/Slave setting
NOTE: (Items 8, 9, 10 are related to Remote Digital Control operation and are explained in Chapter 7).
