Appendix 11 Block Diagram - YOKOGAWA WT1800 User Manual

Appendix 11 Block Diagram

Block Diagram
U
±
I
±
EXT
Motor input circuit (option)
TORQUE
Line filter
SPEED
A
Line filter
SPEED
B
SPEED
Z
External signal (AUX) input circuit (option)
AUX1
Line filter
AUX2
Line filter
Input Signal Flow and Process
Input elements 1 through 6 consist of a voltage input circuit and a current input circuit. The input
circuits are mutually isolated. They are also isolated from the case.
The voltage signal that is applied to the voltage input terminal (U, ±) is normalized using the voltage
divider and the operational amplifier (op-amp) of the voltage input circuit. It is then sent to a voltage
A/D converter.
The current input circuit is equipped with two types of input terminals, a current input terminal (I, ±)
and an external current sensor input connector (EXT). Only one can be used at any given time. The
voltage signal from the current sensor that is received at the external current sensor input connector is
normalized using the voltage divider and the operational amplifier (op-amp). It is then sent to a current
A/D converter.
The current signal that is applied to the current input terminal is converted to a voltage signal by a
shunt. Then, it is sent to the current A/D converter in the same fashion as the voltage signal from the
current sensor.
App-54
Input elements 2 to 6
Input element 1
Voltage input circuit
Voltage measurement input circuit
Line filter
Frequency measurement
input circuit
Frequency
filter
Input peak detection circuit
Current input circuit
Line filter
Frequency
filter
A/D
Zero-crossing
detection
Peak
detection
A/D
Zero-crossing
detection
Peak
detection
Zero-crossing
detection
Zero-crossing
detection
A/D
Peak
detection
A/D
Peak
detection
A/D
Isolator
Zero-crossing
detection
Peak
detection
A/D
Zero-crossing Isolator
detection
Peak
detection
Isolator
Motor
DSP
Isolator
Isolator
AUX
DSP
Isolator
CPU
8.4-inch LCD
DSP
Key
RGB output
(option)
Built-in printer
(option)
Isolator D/A
(option)
USB port
(PC)
USB port
(for peripheral
devices)
GP-IB
Ethernet
IM WT1801-03EN