60
83532002 Rev C
5.13. Over Temperature Protection (OTP)
The OTP circuit shuts down the Power Supply before any 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-Start or Auto-Restart mode.
a) 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” and
the ALARM LED continues to blink. To reset the OTP circuit, press the OUT button
(or send “OUT ON” command via the serial port).
b) Auto-Restart mode: In Auto-Restart mode, the Power Supply recovers to its last
setting automatically when the Over-Temperature condition is removed.
5.14. Last Setting Memory
The Power Supply is equipped with Last Setting Memory, which stores specific Power
Supply parameters at each AC turn-off sequence.
Stored Parameters:
OUT On or Off
Output voltage setting (PV setting)
Output current limit (PC setting)
OVP level
UVL level
FOLD setting
Start-up mode (Safe or Auto-Restart)
Remote/Local (Local Lockout will return to Remote mode)
Address setting
Baud rate
Locked/Unlocked Front Panel
Parallel Master/Slave setting
Remote/Local, Address setting and Baud rate are related to Remote Digital Control and
are explained in Chapter 8.
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