Front Panel Operation - 4
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2 - Setting the Output Frequency
When you turn on the ac source, the default output frequency is a 60 Hz. Assuming the voltage output
from example 1 is in effect (120 Vrms sinewave), change the frequency to 50 Hz as follows:
Action
Display
You can set the frequency in the same way that you set the voltage:
1.
On the Function keypad, press
Freq
. On the Entry keypad, press
5 0 Enter
.
FREQ 50
2.
On the Function keypad, press
Freq
. On the Entry keypad, press
¯
or
°
to
increment or decrement the existing value.
FREQ 50
3.
Rotate the front panel Frequency knob to obtain 50 Hz.
FREQ 50
To verify the output, you can measure it as follows:
4.
On single-phase ac sources, the
φ
1 annunciator is lit. On three-phase ac sources, the
phase annunciator of the last selected phase will be lit. The Meter menu is presently
displaying the measured voltage and frequency of the selected output phase.
You can scroll through all of the measurement functions in the Meter Menu by
pressing the
and
ô
keys.
120 V 50 Hz
3 - Setting a Protection Feature
You can set the ac source to disable its output if it detects an overvoltage or overcurrent fault condition.
Other automatic fault conditions (such as overtemperature) also will disable the output. Set the
overcurrent protection feature as follows:
Action
Display
1.
On the Function keypad, press
Protect
.
PROT:CLEAR
2.
Press
°
to obtain the overcurrent command.
CURR:PROT OFF
3.
On the Entry keypad, press once to scroll to the ON parameter and press
Enter
. The
OCP annunciator will light, indicating that the overcurrent protection circuit is on.
CURR:PROT ON
If you wish to set a time delay between the detection of the fault and the disabling of
the output, scroll to the delay command on the protection menu. The default delay is
100 milliseconds.
Enter the delay from the Entry keypad, such as
. 2 5 0 Enter
.
CURR:PROT ON
DELAY .1
DELAY .250
4.
When you want to restore normal operation after the cause of the overcurrent
condition has been removed, scroll to the protection clear command and press
Enter
. The OCP annunciator then will go off.
PROT:CLEAR
