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Explanation of functions (parameters)
2
FUNCTIONS
<Setting>
•Use Pr. 7 and Pr. 44 to set the acceleration time required to reach the frequency set
in Pr. 20 from 0Hz.
•Use Pr. 8 and Pr. 45 to set the deceleration time required to reach 0Hz from the
frequency set in Pr. 20.
•Pr. 44 and Pr. 45 are valid when the RT signal is on. (When the RT signal is on, the
other second functions (Pr. 44, Pr. 45, Pr. 46, Pr. 47) are also selected.)
•Set "- - -" in Pr. 45 to make the deceleration time equal to the acceleration time (Pr. 44).
CAUTION
1. In S-shaped acceleration/deceleration pattern A (refer to page 89), the set
time is the period required to reach the base frequency set in Pr. 3.
• Acceleration/deceleration time formula when the set frequency is the base
frequency or higher
T: Acceleration/deceleration time setting (s)
f : Set frequency (Hz)
•Guideline for acceleration/deceleration time at the base frequency of 60Hz
(0Hz to set frequency)
2. If the Pr. 20 setting is changed, the settings of calibration functions Pr. 38
and Pr. 39 (frequency setting signal gains) remain unchanged.
To adjust the gains, adjust calibration functions Pr. 38 and Pr. 39.
3. When the setting of Pr. 7, Pr. 8, Pr. 44 or Pr. 45 is "0", the acceleration/
deceleration time is 0.04s.
4. If the acceleration/deceleration time is set to the shortest value, the actual
motor acceleration/deceleration time cannot be made shorter than the
shortest acceleration/deceleration time which is determined by the
mechanical system's J (moment of inertia) and motor torque.
♦Related parameters♦
• Base frequency setting ⇒ Pr. 3 "base frequency" (refer to page 75)
• Acceleration/deceleration pattern, S-pattern acceleration/deceleration A
⇒
Pr. 29 "acceleration/deceleration pattern" (refer to page 89)
• Calibration function ⇒ Pr. 38 "frequency setting voltage gain frequency"
Pr. 39 "frequency setting current gain frequency" (refer to page 92)
• RT signal setting ⇒ Pr. 60 to Pr. 63 (input terminal function selection) (refer to page 109)
• Jog acceleration/deceleration time ⇒ Pr. 16 "jog acceleration/deceleration time"
(refer to page 84)
t =
4
×
T
× f
2
+
5
T
9
(Pr.3)
2
9
Frequency setting (Hz)
Acceleration/
deceleration time (s)
60 120
5 5 12
15 15 35