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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 Output current
limit 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 meter will
continuously cycle between "SAF" and "AU7" every 3 seconds. Releasing the OUT button 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 (AC Input power recycle), the
output is enabled or disabled according to its last settings.
5.11.2
Safe-Start Mode
In this mode, the power supply restores its last operational settings and sets the Output to an OFF state. At start-
up (AC Input power recycle), the output is disabled and the Output voltage and Output current are zero. To
Enable the output and restore the last Output voltage and Output current limit 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, the VOLTAGE meter displays "O7P" and the ALARM
LED blinks.
Resetting the OTP circuit can be automatic (non-latched) or manual (latched) depending on the Safe-Start or
AutoRestart 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 "O7P" and the ALARM LED continues to blink. To reset the
OTP circuit, press the OUT button (or send an OUT ON (OUT 1) command via the RS-232/RS-485 serial
communication port).
2. Auto-Restart mode: In Auto-Restart mode, the power supply recovers to its last setting operational
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. OUTput On or Off
2. Output voltage setting (PV setting)
3. Output current setting (PC setting)
4. Output OVP level
5. Output UVL level
6. FOLDback setting
7. Start-up mode (Safe-Start or Auto-Restart)
8. Remote/Local mode: If the last setting was Local Lockout, (latched mode), the supply will return to
Remote mode (non-latched).
9. Address setting
10. Baud rate setting
11. Locked/Unlocked Front Panel (LFP/UFP)
(Items 8, 9, 10 are related to Remote Digital Control operation and are explained in Chapter 7)
12. Master/Slave setting (for parallel operation)
5.14 SERIES OPERATION
Power supplies of the SAME MODEL can be connected in series to obtain increased output voltage. Split
connection of the power supplies gives both positive and negative output voltage.
Do not connect power supplies from different manufacturers in series or in parallel.
CAUTION
47
83-517-000 Rev. A
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