2. Motor current measurement
l
l
l
(i)
Due to the reactance of the motor, the current is somewhat
smoothed from pulsive waveforms into sine waves.
Therefore,
connect a moving-iron type of ammeter for measurement.
of ammeter
Transistor
amplifier V
(ii) Besides the method outlined in
(i),
the motor current can be
measured by the voltage of
CH34-AG
on card AX04.
The output (DC output) is a result of 3-phase half-wave-
rectifying the actual current. The table below shows the
relationship between the actual current and voltage.
The output voltage differs according to the amplifier and
the setting plug.
0
When S2 is open
Transistor amplifier CH34 voltage V/Arms
.
TRS50
0.190V
TRS75
0.115V
TRSl00
0.085V
TRS150
0.057V
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