User Manual California Instruments
76 CSW Series
3.11.11.2 VOLTAGE/CURRENT CONTROL SETUP menu
Figure 3-28: VOLTAGE/CURRENT CONTROL SETUP menu
The VOLTAGE/CURRENT CONTROL SETUP menu may be used to set output voltage and
current control parameters. These parameters are not frequently changed in the normal
operation of the AC source and are thus located on the UTILITY rather than the PROGRAM
menu.
The following options are available in this menu:
ALC MODE Automatic Level Control of programmed output voltage. This
mode will use the internal voltage measurements to adjust the
output voltage continuously as needed. This effectively
increases the output accuracy and regulation beyond what is
possible with ALC off.
There are three settings for the ALC mode, ON, REG and OFF.
ON: If ALC is ON, any event or load condition that prevents
the power source from regulating the programmed voltage will
cause it to trip the output off and generate a –801, “Output
Voltage Fault”. There may be situations where it is desirable to
continue driving the load even if the programmed voltage
cannot be maintained.
REG: In the REG (Regulate) mode ALC will regulate the
output but not trip the output if for some reason it can’t.
OFF: If the ALC is set OFF, no additional regulation is
performed by the controller other than the hardware control
loop.
Note that if the current limit mode is set to CC (Constant
Current) and the ALC is ON, the output will not trip off if the
load current is at the programmed current limit forcing the unit
into the cc operating mode which requires the voltage to be
reduced from the set value.
OL MODE This field is used to select constant current (CC) or constant
voltage (CV) mode. The constant current mode will limit the
maximum amount of current drawn by the load to the set value.
The voltage will be reduced as needed after the trip delay time
to maintain the level of programmed current.
The constant voltage mode will maintain the set voltage as long
as the current drawn by the load does not exceed the current
limit programmed. If the current limit is exceeded, the output will
be shut off after the trip delay time.
TRIP DELAY The trip delay field may be used to set the amount of time to
hold off the current limit trip point. The minimum amount of time
is 100 ms or 0.1 sec. The maximum amount of time is 5.00
sec.
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