Front Panel Operation
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Note Under certain conditions, the OCP circuit may fail to clear because load demand occurs before the power
supply has time to build up the required output current capacity. In such cases, disable the output (press
)before clearing the OCP circuit. After OCP is cleared, enable the power supply output.
Unregulated Operation
If the power supply goes into a mode of operation that is neither CV nor CC, the Unr annunciator will come on. An
unregulated condition limits the output current to a value that is safe for the supply. Some unregulated states occur so briefly
that they do not turn on the Unr annunciator. One condition that can cause a noticeable unregulated state is low ac line
voltage.
Saving and Recalling Operating States
Normal Operation
You can save programming time by storing up to 5 power supply operating states in nonvolatile memory. The programming
parameters that are saved are:
• Output voltage Output current *OVP voltage
• OCP state (on or off) Output state (enabled or disabled)
As an example, set up the following state:
• Voltage = 4 V Current = 1 A OVP voltage = 5.5 V
• OCP = on (OCP annunciator on) Output = Off (Dis annunciator on)
Save the above state to location 1 by pressing .
Now set up the following state:
• Voltage = 8 V Current = 1.5 A OVP voltage = 8.5 V
• OCP = off (OCP annunciator off) Output = On (Dis annunciator off)
Save the above state to location 2 by pressing .
Now restore the first state by pressing and verify the parameters. Restore the second state by pressing
. Note how the power supply is automatically programmed each time.
Turn-On Operation
Whenever you apply power to a new power supply it automatically turns on in a safe reset state with the following
parameters:
• off minimum near zero
• maximum off
It is recommended that you leave the turn-on conditions as programmed. However, you may change them if you wish. To do
this, proceed as follows:
1. Set up the power supply to the state you want when it is turned on.
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