4-6
IM WT1801-01EN
Positive and Negative Rated Torque Signal Pulse Frequencies (Rated Freq Upper,
Rated Freq Lower)
Range:
1 to 100000000 (Hz)
The following equation is used to compute the torque.
Torque = S(AX + B) – NULL
S:
The scaling factor
1
A:
The torque pulse coefficient
2
X:
The pulse frequency
B:
The torque pulse offset
2
NULL:
1 If the torque signal is a changed signal, you can set the
to determine the torque before the
change.
2 The torque pulse coefficient and torque pulse offset are determined from the torque signal pulse rating as
shown in the next figure.
Relationship between the Torque Signal Pulse Input Range and Pulse Rating
To measure a torque of –20 N•m to +20 N•m using a torque meter with specifications in the figure below,
configure the pulse input range and pulse rating settings as indicated below.
• Upper limit of the pulse input range (Pulse Range Upper): 20.0000
• Lower limit of the pulse input range (Pulse Range Lower): –20.0000
• Positive rated torque signal value (Rated Upper):
50.0000
• Negative rated torque signal value (Rated Lower): –50.0000
• Positive rated torque signal pulse frequency (Rated Freq Upper): 15000
• Negative rated torque signal pulse frequency (Rated Freq Lower): 5000
Torque sensor specifications
Slope: Torque pulse
coefficient (A)
Torque pulse offset (B)
Number of output pulses
15 kHz
5 kHz
–
50 N•m
Output axis
50 N•m
Torque input
Torque signal to the WT1800
Pulse signal corresponding to –20 N•m to +20 N•m
D/A output signal to the recorder
±5 V for –20 N•m to +20 N•m
Motor
Load
WT1800
Recorder
Pulse output
torque sensor
Pulse rating (positive): 15 kHz is output at a torque
of 50 N•m
Pulse rating (negative): 5 kHz is output at a torque
of –50 N•m
4 Motor Evaluation Conditions (Option)
