Over-Temperature Protection; View Settings; Lock Settings - Metek Sorensen XEL serie Manual De Operación

With the OUTPUT off the load is still connected to the power supply output stage; the output voltage
is simply set to zero. Do not apply external voltages to the power supply terminals in excess of the
rated output voltage, even with the output off, or damage may result.

Over-temperature Protection

An internal sensor will detect over-temperature due to blocked airflow, fan failure or other circuit
fault. Over-temperature will turn the output off, the OUTPUT indicator will flash, and the display will
show the message
and the instrument has cooled down, the output indicator will go off but the message
continues to show. Pressing the OUTPUT key once will change the display to show the preset
voltage and current (the SETTINGS indicator will be lit) but the output will remain off; pressing it a
second time will turn the output on normally.
If the OUTPUT key is pressed while the instrument is still over-temperature (OUTPUT indicator is
flashing), the message
indicator will be lit) but the output will remain off; each subsequent press of the OUTPUT key causes
the OtP triP
temperature condition ends.

View Settings

Lock Settings

Pressing the LOCK key digitally locks the set voltage and current limit. The settings are stored with
a precision of better than 1 digit. Subsequent adjustments of the VOLTAGE and CURRENT controls
will have no effect.
Because cancelling LOCK will cause the output settings to change if the VOLTAGE and CURRENT
control positions have been moved, warning reminders are given before LOCK is cancelled. Press
and hold the key to cancel LOCK.
If the OUTPUT is off (the safe condition) the display will flash the 'unlocked' settings twice before
the change is implemented; the LOCK lamp goes off.
Releasing the LOCK key at any time while the display is flashing will abort the LOCK cancellation.
Attempting to change the current limit range (see Setting up the Output section) or the voltage span
limits (see Voltage Span section) with LOCK enabled is not allowed; if attempted, the message
Unloc is shown briefly in the display and the LOCK indicator is also flashed. If the output is also
on when these actions are attempted the message
(accompanied by the output indicator flashing) followed by the message
indicator flashing).
The LOCK status at power on is the same as at last power off.
16
OtP triP . When the cause of the over-temperature has been removed,
OtP triP is replaced by the preset voltage and current (the SETTINGS
message to be displayed briefly but the output will remain off until the over-
The set voltage and current limit are always shown when
the output is off but can also be viewed when the output is
on by pressing the VIEW key; the SETTINGS indicator is lit
whilst the VIEW key is pressed.
If the output is still on,
display, followed by flashing of the new 'unlocked' settings for 2-3
seconds (slowly at first, then faster) before the change is finally
implemented; the LOCK lamp goes off when the change is made.
OP on (output on) will flash twice in the
turn oFF is first shown in the display
OtP triP
Unloc (with the LOCK