190
Specications of Input, Output, and Measurement
(3) Frequency input specications (Ch. A, Ch. B, Ch. C, Ch. D, Ch. E, Ch. F, Ch. G, Ch. H)
Detection level Low: approx. 0.8 V or less; high: approx. 2.0 V or more
Measurement
frequency band
0.1 Hz to 2 MHz (when the duty ratio is set at 50%)
Minimum detection
width
0.25 µs or more
Measurement range The zero-point frequency fc and frequency fd at rated torque in fc
±
fd (Hz) can be set.
Set fc and fd using 7-digit gures in the range of 1 kHz to 500 kHz.
However, values must be set so that both the following inequalities, (fc + fd) ≤ 500 kHz
and (fc − fd) ≥ 1 kHz both are met.
Measurement
accuracy
±
0.01% of reading
Display range 1.000 kHz to 500.000 kHz
Scaling
±
0.01 to 9999.99
Zero adjustment Input osets can be zero-corrected within the range of fc
±
1 kHz.
When the torque meter correction is enabled, zero-correction is performed after adding a
correction value.
Unit Millinewton-meter (mN
m), newton-meter (N
m), kilonewton-meter (kN
m)
Torque meter
correction
O/on
• Nonlinearity correction
Torque values are corrected using a 11-point (at a maximum) correction table of torque
calibration points (N
m) vs. torque calibration values (N
m).
• Friction correction
Torque values are corrected using the 11-point (at a maximum) correction table of RPM
values (r/min) with consideration of rotation directions vs. torque calibration values (N
m).
Each interval between torque calibration values are lineally interpolated.
The unit for the correction table depends on the setting.
Enter a 6-digit correction value.
The signs of torque calculation are used for detecting rotation directions: forward (plus
sign) and backward (minus sing).
Torque calculation
and correction
When disabled: (Torque value) = S
×
[X − (Zero-correction value)]
When enabled: (Torque value) = S
×
[X − (Zero-correction value)] − At − Bt
S: Scaling
X: Input signal-to-torque converted value
At: Nonlinearity correction value
Bt: Friction correction value
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