15-1
IM 253710-01E
Motor Evaluation Function (Applicable to Motor Modules)
15
Chapter 15 Motor Evaluation Function (Applicable to Motor Modules)
15.1 Inputting Signals of rotating speed and Torque
Signals from revolution sensors and torque meters can be input to channels 7 and 8 of
the PZ4000. For revolution sensors, the signal is the DC voltage (analog signal) or the
pulse count that are proportional to the rotating speed of the motor. For torque meters, it
is the DC voltage (analog signal) that is proportional to the torque of the motor. By using
the active power and frequency that are measured using the power measurement
module and the rotating speed and torque data input through the motor module, the
PZ4000 can compute parameters such as motor output, synchronous speed, slip, motor
efficiency, and total efficiency.
CAUTION
When the PZ4000 is ON, do not apply a voltage that exceeds the maximum
allowable input of 50 Vpk or 25 Vrms to the sensor input connector. When the
PZ4000 is OFF, turn off the power supplied to the sensor input connector.
Revolution Sensor Signal Input Channel (CH7)
Input the signal output from the revolution sensor (a DC voltage (analog signal) or a
pulse signal that is proportional to the rotating speed of the motor) according to the
following specifications.
DC voltage (analog input)
Item
Specifications
Connector type
BNC connector
Measurement range
50 Vpk, 20 Vpk, 10 Vpk, 5 Vpk, 2 Vpk, and 1 Vpk
Effective input range
±
100% of the measurement range
Input impedance
Approx. 1 M
Ω
and 17 pF
Maximum allowable input
50 Vpk or 25 Vrms, whichever is less
Continuous maximum common
600 Vrms (CAT II)
mode voltage
*
For other specifications, see chapter 17.
Pulse input
Item
Specifications
Connector type
BNC connector
Frequency range
1 Hz to 200 kHz
Amplitude input range
±
5 V
Effective amplitude
1 V (Peak-to-Peak) or more
Input waveform
50% duty cycle square wave
Torque Meter Signal Input Channel (CH8)
Input the signal output from the torque meter (a DC voltage (analog signal) that is
proportional to the torque of the motor) according to the following specifications.
Item
Specifications
Connector type
BNC connector
Measurement range
50 Vpk, 20 Vpk, 10 Vpk, 5 Vpk, 2 Vpk, and 1 Vpk
Effective input range
±
100% of the measurement range
Input impedance
Approx. 1 M
Ω
and 17 pF
Maximum allowable input
50 Vpk or 25 Vrms, whichever is less
Continuous maximum common
600 Vrms (CAT II)
mode voltage
*
For other specifications, see chapter 17.