Mitsubishi Electric FR-A800 Series Instruction Manual page 625

NOTE
• Normally, set Pr.7 Acceleration time and Pr.8 Deceleration time to 0 s. When the Pr.7 and Pr.8 settings are large, dancer
control response becomes slow during acceleration/deceleration.
• The Pr.127 PID control automatic switchover frequency setting is enabled. The larger setting value between Pr.7 and
Pr.44 is used as the acceleration time during normal operation. For the deceleration time, the larger setting value between
Pr.8 and Pr.45 is used. (For details on Pr.127, refer to
• If an automatic restart after instantaneous power failure is activated during dancer control, E.OC[] or E.OV[] is likely to occur.
In such case, disable the automatic restart after instantaneous power failure function (Pr.57 = "9999").
 Connection diagram
• Sink logic
• Pr.128 = 41
• Pr.182 = 14
• Pr.193 = 14
• Pr.194 = 15
• Pr.133 = Set point
*1 The main speed command differs according to each operation mode (External, PU, communication).
*2 The applied output terminals differ by the settings of Pr.190 to Pr.196 (Output terminal function selection).
*3 The applied input terminals differ by the settings of Pr.178 to Pr.189 (Input terminal function selection).
*4 The AU signal need not be input.
 Dancer control operation selection (Pr.128)
Pr.128 setting
0 PID disabled
40 Reverse action
41 Forward action
42 Reverse action
43 Forward action
Others Refer to
*1 When Pr.133 ≠ "9999", the Pr.133 setting is valid.
• To enable dancer control, set "40 to 43" in Pr.128 PID action selection.
• Dancer control is enabled only when the PID control valid (X14) signal turns ON when "14" is set in one of Pr.178 to Pr.182
(Input terminal function selection) and X14 signal is assigned. When the X14 signal is not assigned, dancer control is
enabled only by the Pr.128 setting.
• Input the main speed command (External, PU, Communication). Dancer control is also supported by the main speed
command in all operation modes.
• Input the set point between the terminals 2 and 5 (the setting can be selected using Pr.133 or Pr.609) and input the
measured value signal (dancer roll position detection signal) between the inverter terminals 4 and 5 (the setting can be
selected using Pr.610).
• The action of Pr.129 PID proportional band, Pr.130 PID integral time, Pr.131 PID upper limit, Pr.132 PID lower limit
and Pr.134 PID differential time is the same as PID control action. In the relationship between the control amount (%)
and frequency in PID control, 0% and 100% are equivalent to the frequencies set to Pr.902 and Pr.903, respectively.
624
5. PARAMETERS
5.14 (A) Application parameters
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PID control selection
Main speed command
setting potentiometer
Feedback value of
dancer roll position
PID action Additive method
—
Fixed
Ratio
page 601.
search engine
page 601.)
Inverter
MCCB
R/L1
Power supply
S/L2
T/L3
STF
Forward rotation
Reverse rotation STR
RH(X14)
SD
10
2
∗1
5
4 ∗4
Set point input
—
Set by Pr.133 or input by
terminal selected by Pr.609
Motor
U
V IM
W
∗3
(FUP)FU Upper limit
∗2
∗2 (FDN)OL Lower limit
Output signal common
SE
Measured value input
—
Input by terminal selected by
*1
Pr.610