2-10 Basic Power Supply Operation
E. CURRent:TYPe <name>
Parameters are summarized in Table 2-4 and described as follows:
1. With the LIMit type selected, the output will remain on when the current limit is
reached.
2. With the TRIP mode selected, the output will turn off when the current limit is reached.
3. With the LIMRELAY (or LIMITRELAY) mode (Figure 2-3), the relay output turns on
(ONE) when the current limit is reached, and the relay output turns off (ZERO) when
the unit is not in current limit.
4. With the TRIPRELAY mode (Figure 2-4), the relay output turns on and the power sup-
ply output turns off when the current limit is tripped, and the unit must be manually re-
set to turn the relay output off and the power supply output back on. If the condition that
caused the trip has not be corrected, the output will trip again.
Note that you can also use the OUTPut:RELay command to set the relay state (see Sec-
tion 5). The parameter choices are ONE and ZERO. With the current limit mode set to
LIMit or TRIP, the relay state operates independently based on the command parameter.
However, with LIMRELAY (or LIMITRELAY) and TRIPRELAY, the command pa-
rameters may be used to override the relay state and cause the relay state not to track
the current limit state. For LIMRELAY, this condition may occur only momentary
while the limiting condition still exists. With TRIPRELAY, this condition allows you to
clear the relay tracking while correcting the tripping condition. Once corrected, and the
output state is turned ON, tracking will resume.
F. CURRent:STATe?
1. With the LIMit type selected, this command returns a “1” if the power supply is oper-
ating as a constant-current source (current limit reached). With the TRIP type selected,
a “1” is returned if the output has turned off (tripped) due to current limit being reached.
It will clear to “0” when the output is turned back on.
2. The operation event register can be read to determine if the power supply is in current
limit and if the output has tripped (turned off) as a result of the current limit condition.
See Section 7 for details.
Table 2-4
Current limit type (CURRent:TYPe) command parameters
Parameter choice Current limit effect Output state External relay state
LIMit Current will be limited. Remains on Not affected.
TRIP Current will trip. Goes off Not affected.
LIMRELAY or
LIMITRELAY
Current will be limited. Remains on Tracks current limit state.
TRIPRELAY Current will trip. Goes off Tracks current limit state.
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