11.5. Output Protection
11.5.1. Set Over-Voltage Protection
This command sets the over-voltage protection level. If the power supply output exceeds this voltage at
it’s output (or at a remote sense point), then the output will immediately turn off, the supply front panel
will show “OUP” and the Questionable Condition register bit 4 will be set high.
The voltage limit setting, made by the front panel encoder or the :VOLT command (in section 11.2.1), is
restricted to 95% of the OVP setting. Likewise, the OVP setting cannot be made lower than 105% of the
voltage limit setting. The over-voltage protection may not be disabled
The OVP setting may be viewed on the supply front panel by pressing and releasing the OVP/UVL button.
This fault is cleared by turning the power supply output on again
Syntax:
[SOURce]:VOLTage:PROTection:LEVel <nn.nn|MAX>
Parameter: nn.nn will set the OVP to a value in volts
MAX will set the OVP to the maximum value,
typically 10% above the power supply’s voltage rating
Example:
:VOLT:PROT:LEV 70
Query: :VOLT:PROT:LEV? will return 70 in the example
Errors: SYSTEM:ERROR? may return errors including:
+304,”OVP below PV”
-222,”Data out of range”
11.5.2. Read Over-Voltage Tripped
This query reports if an over-voltage protection fault has occurred. If a fault has occurred, it may be cleared
by turning the power supply output on again (see the OUTP:STAT ON command, section 11.2.3)
Syntax:
[SOURce] :VOLTage :PROTection :TRIPped ?
Example: :VOLT :PROT :TRIP ?
Responses: 0 when no OVP fault is active
1 when supply is shut-down because of an OVP fault
11.5.3. Set Under-Voltage Limit
The under-voltage limit keeps the voltage setting from being less than a certain value. If the actual power
supply output (or remote sense point) drops below the UVL, no fault is reported and the supply continues
to operate in the constant-current mode (you may use the foldback protection to report a fault when this
occurs, see section 11.5.5)
The voltage limit setting, made by the front panel encoder or the:
VOLT command (in section 11.2.1), must
always be higher than 105% of the UVL setting. Likewise, the UVL setting cannot be made higher than
95% of the voltage setting
The UVL setting may be viewed on the supply front panel by pressing and releasing the OVP/UVL button
twice.
Syntax:
[SOURce]:VOLTage:LIMit:LOW <nn.nn>
Parameter: nn.nn will set the UVL to a value in volts
Range is zero to 95% of the present voltage setting
Example:
:VOLT:LIM:LOW 5.100
Query: :VOLT:LIM:LOW? will return 5.100 in the example
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