Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 702

Pr.
144
Speed setting switchover
M002
Overspeed detection
285
H416
frequency
*2*3 *4
359 852
Encoder rotation direction 1
C141 C241
*2
367
Speed feedback range
G240
*2
368
Feedback gain
G241
*2*3 *4
369 851
Number of encoder pulses 1024
C140 C240
*1 The speed deviation excess detection frequency is used when Vector control compatible option is mounted during Vector control. (Refer to
259 for details.)
*2 The setting is available when a Vector control compatible option is installed.
*3 The parameter number is the one for use a Vector control compatible option. (Pr.369 is applicable for the FR-A8AP and FR-A8AL.)
*4 The parameter number is the one for use with the control terminal option (FR-A8TP).
 Setting before operation (Pr.144, Pr.359, Pr.369)
• For the operation during encoder feedback control under V/F control, set the number of motor poles in Pr.144 Speed
setting switchover in accordance with the applied motor. Since the Pr.81 Number of motor poles setting is used during
Advanced magnetic flux vector, the Pr.144 setting does not need to be changed.
• Use Pr.359 Encoder rotation direction and Pr.369 Number of encoder pulses to set the rotation direction and the
number of pulses for the encoder.
NOTE
• Operating the inverter with Pr.144 = "0, 10, 12, 110, or 112" causes E.1 to E.3.
• When "102, 104, 106, or 108" is set in Pr.144, the value obtained by subtracting 100 from the set value will be set as the
number of poles.
• The Pr.144 setting changes automatically when setting the motor poles in Pr.81, but even if Pr.144 is changed, Pr.81 will not
automatically change.
• Control with correct speed is not possible if the number of poles for the applied motor is incorrect. Check first before operation.
• Encoder feedback control is not possible when the rotation direction setting of the encoder is incorrect. (Operation of the
inverter is possible.)
Check the indicator on the parameter unit to confirm the direction.
Initial
Name
value
4
9999
*1
9999
1
Setting range
0, 2, 4, 6, 8, 10, 12,
Set the number of motor poles for the encoder
102, 104, 106, 108,
feedback control under V/F control.
110, 112
When the difference between the detected frequency
and the output frequency exceeds the set value during
0 to 30 Hz
encoder feedback control, an inverter fault (E.MB1) is
generated.
9999 Overspeed detection is disabled.
Set when using a motor for
0
which forward rotation
(encoder) is clockwise (CW)
viewed from the shaft
100
Set when using a motor for
1
which forward rotation
(encoder) is counterclockwise
(CCW) viewed from the shaft
101
0 to 590 Hz Set the range of speed feedback control.
9999 The encoder feedback control is disabled.
0 to 100 Set when the rotation is unstable or response is slow.
Set the number of encoder pulses.
0 to 4096
Set the number of pulses before it is multiplied by 4.
Description
Set for the operation
at 120 Hz or less.
Set for the operation
at a frequency
CW
higher than 120 Hz.
Set for the operation
at 120 Hz or less.
Set for the operation
at a frequency
CCW
higher than 120 Hz.
5. PARAMETERS
5.16 (G) Control parameters
1
2
3
4
5
6
7
8
page
9
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701