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6.5 Setting Over-Voltage and Over-Current protection
OVP/OCP
The power supply offers user adjustable over-voltage protection (OVP) and over-current
protection (OCP). If a voltage is detected that exceeds the OVP level, or a current is detected
that exceeds the OCP level, the output is switched off and the message OVP or OCP is
displayed.
OVP is adjustable between 1V and 40V for outputs 1 and 2, and between 1V and 80V for
output 3 and 4. OCP is adjustable between 0.01A and 7A for outputs 1 and 2, and between
0.01A and 3.5A for output 3 and 4.
Pressing the OVP/OCP soft key
creates a new set of soft keys from
which OVP & OCP values can be
set or turned on or off.
Pressing OVP Set causes the key
to illuminate and makes the OVP
value settable. A new value can be
entered using the numeric keypad or by the spin wheel if enabled. OVP can be turned off by
pressing OVP OFF, and turned back on by pressing OVP On. The previous OVP value is
retained when OVP is off and is displayed in brackets.
Similar capabilities are provided for controlling OCP.
Note that, when set to OFF, the function is not completely disabled but is set to the maximum
value for the output. Thus, if OVP was set to OFF on output 1 and an external voltage greater
than 40V was applied to the terminals, an OVP trip would occur.
More information on using OVP and OCP is provided in section 10.7.
6.6 Setting the Voltage/Current Range
Range
Each output has more than one range. For outputs 1 and 2 the choice is 35V/3A, 16V/6A or
35V/6A. For outputs 3 and 4 the choice is 35V/3A, 70V/1.5A or 70V/3A.
Note that selecting a high power setting may require the disabling of other outputs, see table in
section 1.
Pressing the Range soft key brings
up a menu screen which indicates
the currently selected range and
output with a flashing arrow.
All output ranges can be amended
or disabled from this screen using
the soft keys, select the output with
the up and down arrow soft keys and press the desired range soft key. Pressing the cancel soft
key will return to the output screen and the range will remain unchanged, pressing the OK soft
key will action the changes made.
Note that a change of range can only be made when the output is off. If the output is on, a
message will prompt the user to turn it off.