Hioki PW3336-01, Instruction Manual

Page: 65 / 206

3.2 Configuring Settings
59
When inputting a voltage in excess of the instrument’s maximum input voltage of 1,000 V or a current in
excess of its maximum input current of 70 A, use an external VT (PT) or CT, respectively. This section
describes how to set the ratio (VT ratio or CT ratio) when using an external VT or CT. Even when using an
external current sensor, it is necessary to set the CT ratio.
The VT and CT ratios can be set separately for each wiring mode.
By setting the VT and CT ratios, you can read primary-side current and voltage input values directly.
VT ratio setting range
0.1 to 0.9, 1.0 to 9.9, 10.0 to 99.9, 100.0 to 999.9, (1,000)
(If the VT ratio display changes to 0.0, 00.0, 000.0, the instrument internally multiplies measured values by a
VT ratio of 1,000.
CT ratio setting range
0.001 to 0.009, 0.010 to 0.099, 0.100 to 0.999, 1.000 to 9.999, 10.00 to 99.99, 100.0 to 999.9 (1,000)
(If the CT ratio display changes to 0.0, 00.0, 000.0, the instrument internally multiplies measured values by a
CT ratio of 1,000.
3.2.9 Setting the VT and CT Ratio
Exercise caution if the VT or CT lamp lights up as this state indicates that a voltage or cur-
rent that differs from the indicated measured value is being input.
When using a wiring mode other than 1P2W, the CT and CT ratios will be standardized using the CH1 set-
ting.
This indicates that the VT or CT ratio cannot be changed.
After pressing to exit the setting, perform the following procedure:
Status Solution and reference for more information
During integration operation
(
RUN lamp lit up or flashing)
The VT and CT ratios cannot be changed until the integrated value is reset
(so that the
RUN lamp turns off).
See: Canceling integration (resetting integrated values) (p.65)
During display hold operation or
maximum value/minimum value
hold operation (
HOLD , MIN , or
MAX lamp lit up)
The VT and CT ratios cannot be changed until this operation is canceled
(so that the
HOLD lamp turns off).
See: Canceling the display hold state (p.108)
Returning to the instantaneous value display (p.109)
If the VT or CT ratio does not flash