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Basic Functions (pr. 0 To Pr. 9); Torque Boost (pr. 0); Maximum And Minimum Speed Settings (pr. 1, Pr. 2) - Mitsubishi Electric FR-V560 Instruction Manual

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4.3 Basic functions (Pr. 0 to Pr. 9)

4.3.1

Torque boost (Pr. 0)

Use this parameter for V/F control only.
Motor torque in the low speed region can be adjusted according to the load to increase the starting motor
torque.
Parameter
Name
0
Torque boost (manual)
<Setting>
• Increase the setting when the distance between the inverter and motor is long or when the motor torque in the low
speed region is insufficient (when the stall prevention protective function is activated), for example.
• Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
CAUTION
If the setting is too large, the motor may result in overheat or overcurrent trip. The guideline for
maximum value is about 10%.
4.3.2
Maximum and minimum speed settings
with
without
Encoder
Encoder
(Pr. 1
Speed
You can limit the maximum (minimum) speed.
Speed control
The maximum setting is placed on the running speed.
The minimum setting is placed on the preset speed.
Torque control
The maximum and minimum settings are made on the speed
restriction commands. (Restriction is not placed on the running
speed.)
Position control
The maximum setting is valid for the speed command obtained
from the droop pulses. The minimum setting is invalid.
Parameter
Name
1
Maximum speed
2
Minimum speed
<Setting>
Speed control
• When the upper limit of the output speed is set in Pr. 1, the output speed is clamped at the maximum speed even if
the speed command entered is higher than the speed set in Pr.1. (This also applies to the minimum speed setting.)
When the Pr. 2 setting is higher than Pr. 13 "starting speed" value, note that the motor will run at the
preset speed by merely turning the start signal on, even if the command speed has not been entered.
Related parameters
• Starting speed setting ⇒ Pr. 13 "starting speed" (Refer to page 97.)
• Speed restriction command selection for torque control ⇒ Pr. 807 "speed restriction selection" (Refer to page 185.)
• External (example: terminal 2-5 connection) speed setting potentiometer adjustment ⇒ Pr. 902 "speed setting No. 2 bias" (Refer to
page 202.),
Pr. 903 "speed setting No. 2 gain" (Refer to page 202.)
Factory Setting
3%/2%/1%
(2.2K/3.7K, 7.5K/15K or more)
with
without
Condi-
tional PLC
SSC
Encoder
Encoder
, Pr. 2
Torque
Position
Factory Setting
1800r/min
0r/min
CAUTION
89
Basic functions (Pr. 0 to Pr. 9)
Setting
Range
0 to 30%
with
without
with
Encoder
Encoder
Encoder
Torque
Speed
Output speed (r/min)
Pr.1
Pr.2
Setting Range
0 to 3600r/min
Simple mode
0 to 3600r/min
Simple mode
Remarks
Extended mode
without
Encoder
)
Set speed
0
10V
Remarks
4

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