Using Over Temperature Protection Lock (OTP)
M370078-01
3-29
3
Using Over Temperature Protection Lock (OTP)
The OTP lock protects the power supply in the event of an over
temperature alarm. This alarm could be caused by ventilation restriction
or overheating due to fan failure.
Two modes are available:
•
Auto recovery (OTP OFF) where the power supply turns on again
after cooling down.
•
Latch mode (OTP ON) where you will need to reset the unit by
turning the front panel power switch to Off and then On again.
If the OTP is activated, the main output will turn off and
PRO O7P
(over
temperature protection) will blink on the display. The OTP alarm is an
alarm that will auto recover when the temperature falls back into normal
bounds.
Defining the OTP Mode
To define the OTP lock:
1. Turn the 9-position mode control to the PRT position.
PrO OUP
is displayed.
2. Turn the rotary Adjust/Enter control until
PRO O7P
is displayed.
3. Press the rotary Adjust/Enter control to display
O7P ON or OFF
.
4. Turn the rotary Adjust/Enter control to change to On or Off.
5. Press the rotary Adjust/Enter control.
The SCPI command (s) for these instructions are:
[:]SYSTem[<channel(s)>]:PROTection:LATCh
Resetting in Latch Mode
To reset the power supply if the OTP alarm is tripped and the OTP mode
is set to On (latching enabled), press and hold the rotary Adjust/Enter
control for approximately 3 seconds.
The SCPI command (s) for these instructions are:
[:]OUTPut[<channel(s)>]:PROTection:CLEar
[:]SYSTem[<channel(s)>]:PROTection:LATCh
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