Specifications

4. Precautions concerning preparation before use
Please read the following carefully before use.
(1) Transportation
Be sure to prevent the indicators from vibration or shock as much as possible during transportation.
In situations where it is possible that indicators will be subject to excessive vibration or shock, remove the indicator from the
panel before transportation.
When the indicators are received, check the indicators for any abnormalities in appearance or operation that may have been
caused as a result of excessive vibration or shock during transportation.
(2) Check the product name and rating
As a precautionary measure, check the product name and rating (e.g., voltage, current, frequency, phase-wire) before use.
(3) Adjustment
If an indication corresponding to an input is to be adjusted in an indicator with a built-in adjustment resistor such as a DC
ammeter or receiving indicator, perform adjustment without applying excessive force to the adjuster. Otherwise, the adjuster
may break.
Additionally, avoid using the adjuster under normal circumstances.
(4) Insulation resistance test and voltage test
Please read the following carefully before performing an insulation resistance test or voltage test. Not doing so may cause
indicator failure.
6
Indicator Line-up,
Precautions & Specifications
· Varmeters and power factor meters will not operate correctly with a reverse phase sequence. Use with the correct phase
sequence.
· Grounding of the secondary side of an instrument voltage transformer or current transformer is not necessary for low-voltage
circuits.
· When performing an insulation resistance or voltage test between 1) an electrical circuit and an outer
casing, or 2) a voltage circuit and a current circuit, short-circuit the input terminals in both the current and
voltage circuits. Not doing so may cause the indicator to malfunction.
· The applied voltage for the voltage test varies according to the indicator model. Please note the voltages
indicated in this catalog.
· For the applied voltage of the impulse withstand test, apply a 1.2
✕50ms standard lightning impulse voltage
waveform with a full wave voltage of 5kV six times or less.
· Be careful of where voltage is applied; applying voltage across terminals of equal potential, such as across
VT input terminals, may cause failure.
CAUTION
· Connections must be made correctly as shown in the connection diagrams of the catalog. Inappropriate
connection and installation may cause equipment burnout, fire or leakage of electricity.
· For connection, use crimp terminals suited for the electrical quantity and terminal size.
· Make sure to use the terminal screws supplied with the product.
· The terminal screws must be tightened by appropriate tools at torques appropriate for the screw size.
Failure to do so may cause overheating, equipment burnout or fire.
* Recommended tightening torques M4 screws: 0.98~1.47N·m
M5 screws: 1.47~1.96N·m
· Do not perform connection work with live wires.
Dangers include electrical shock, electrical burns, equipment burnout and fire.
· For safety, make sure to attach the terminal cover.
· Indicators combined with a current transformer (CT) must be correctly connected to the CT secondary-side
signal. Incorrect connection or opening of the secondary side of the CT will generate high voltage on the
secondary side of the CT, which may lead to CT failure, scorching or a fire.
· Indicators combined with a voltage transformer (VT) must be correctly connected to the secondary side of
the VT. Incorrect connection or short-circuiting of the secondary side of the VT will cause a large overcurrent
to flow through the secondary winding of the VT, leading to scorching of the secondary winding and VT
failure, scorching or a fire.
CAUTION