35
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" and the
ALARM LED blinks. Resetting the OTP circuit can be automatic (non-latched) or manual (latched)
depending on the Safe or Automatic 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 continue to shows "OTP" and the ALARM LED continues
to blink. To reset the OTP circuit, press OUTPUT button (or send OUT ON command via the serial
port).
2. Auto-restart mode: In Auto-restart mode, the power supply recovers to it's 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 power supply parameters at
each AC turn-off sequence.
STOREDPARAMETERS:
1. Output voltage setting
2. Output current setting
3 .OVP level
4. UVL level
5. FOLD setting
6. Start-up mode (Safe or Auto-restart)
7. Remote/Local (If the last setting was Local Lockout, the supply will return to Remote mode)
8. Address setting
9. Baud rate
10. Locked /Unlocked front panel
(Items 7, 8, 9 are related to Remote digital control operation and explained in chapter 6)
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 positive and negative output voltage.
CAUTION
Do not connect power supplies from different manufacturers in series or in
parallel.
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