Bulletin No. 3020IB9814
December 1998
54
Setting the Nominal The circuit monitor supports three nominal frequencies: 50 Hz, 60 Hz, and
Frequency 400 Hz. The factory default is 60 Hz.
To change the nominal frequency, complete the following steps:
1. Press the MODE button until the red LED next to [Setup] is lit.
The circuit monitor displays “ConFig.”
2. Press the PHASE [Enter] button to select the Configuration option.
The circuit monitor displays the password prompt “P - - - -.”
3. Enter the password.
To enter the password, use the SELECT METER [Value] buttons to
increase or decrease the displayed value until it reaches the password
value. Then press the PHASE [Enter] button.
4. Press the PHASE [Enter] button until the red LED next to [Nom. Freq.]
flashes.
5. Press the SELECT METER [Value] buttons until the desired frequency is
displayed.
6. Press the MODE button once.
The red LED next to [Accept] flashes. The red LED next to [Nom. Freq.]
glows steadily.
7. To reject the new nominal frequency, press the PHASE [Enter] button
once.
The circuit monitor returns to METERS mode.
8. To accept the new nominal frequency, press the SELECT METER [Value]
button once to change from No to Yes. Then, press the PHASE [Enter]
button.
The circuit monitor restarts.
Note: If the circuit monitor cannot measure a valid frequency, it uses the nominal
frequency to perform metering calculations. For example, with no voltage present,
the circuit monitor will meter amps using the nominal frequency in place of the
missing measured frequency. Some metered values—such as THD and K-Factor—
require a valid frequency. When a valid frequency cannot be measured, the circuit
monitor displays dashes in place of values.
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