Wayne Kerr AP10030, Руководство пользователя и обслуживания

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20 Wayne Kerr AP 1kW Power Supplies • Issue 2
6.4 Operating Modes
6.4.1 Normal Operating Mode
The unit is factory set for normal operation i.e. operation via front panel controls and
front panel sensing.
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Inhib Imon
Iprog Vprog Common
-S -S
-
+S
+
To -ve busbar
To +ve busbar
Fig. 6.2. Rear barrier strip linking for normal mode
Constant Voltage (CV)
Ensure that the ‘output enable’ switch is in the out position, wait 30 seconds and remove
the rear terminal cover. Connect the load leads to the output busbars. Refer to section
6.2. “Connecting the Load”. Connect the unit to a suitable supply and replace the rear
cover. Switch on by moving the circuit breaker to the ‘ON’ position.
The front panel voltmeter and ammeter will illuminate and display the values at which
the controls were set. Output voltage and current limit settings can now be set to the
required values. The overvoltage trip point can also be set. The ‘output enable’ switch
should now be depressed. Power will be applied to the load and the voltage and current
delivered to the load will be indicated on the AP units by the meters.
Provided that the current limit point has been set higher than the actual current flowing
into the load, then the ‘CV’ legend will be illuminated. Whenever the load current
reaches the previously set current limit figure, the power supply will automatically
change to constant current operation. This illuminates the CI legend and extinguishes the
CV legend. If the product of the current taken and the output voltage exceed 1kW (before
reaching the current limit setting) the output current will be limited by the internal power
limit circuit.
To avoid unwanted CV/CI crossover, an allowance should be made6.44 for the peak
currents taken by the load when setting the current limit level.
Constant Current (CI)
With the power supply switched on and the ‘output enable’ switch out, the ammeter will
display the prospective current limit setting. This setting may be adjusted by the front
panel control.
The output voltage should be set to a higher value than that which would be developed
across the load with the required constant current flowing.
When the ‘output enable’ switch is pressed in, power is applied to the load and the
meters indicate the voltage and current delivered to the load. If the voltage at the output
busbars is less than the voltage setting, the ‘CI’ legend will be illuminated. If the load
changes such that the voltage developed across it reaches the pre-set voltage level then