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8 PARAMETER FUNCTIONS
8-13
8
Initial value
Pr. 74 "filter time constant" 1
You can set the filter time constants of the speed command input terminals (terminals 2, 1, 4).
Increase the value if stable operation cannot be performed due to the influence of noise on the
speed command signal. Decreasing the value makes the speed command signal more susceptible
to noise but the response of the speed command faster. Conversely, increasing the value makes
the speed command signal less susceptible to noise but the response of the speed command
slower.
Setting
0 to 8
Initial value
Pr. 252 "override bias" 50
Pr. 253 "override gain" 150
Speed compensation of a given ratio is made for the main speed setting signal.
The relationship between the compensation speed and override value is as indicated below.
α
Compensation speed = pre-compensation speed
×
100
(r/min)
α
: Override value (%)
Use Pr. 74 when the Pr. 73 setting is any of 4, 5, 14 and 15.
Parameter Number Setting Range Unit
252 0.0 to 200.0 %
253 0.0 to 200.0 %
0V 5V
(2.5V)
10V
(5V)
0
50
100
150
200
Pr. 253
Voltage across terminals 2-5
Pr. 252
Override value (%)
Factory setting
(50% to 150%)