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5.8.3 Stall prevention
• Stall occurs when the rotor cannot keep up with the rotating magnetic
field on the motor start side.
e.g. a large load is applied to the motor and sudden acceleration or
deceleration is performed, etc.
5.8.3.1 Stall prevention at start : P2.01
Parameter
Name
Unit
No.
Stall
P2.01
Prevention
-
at Start
• P2.01 can be used to set the stall prevention function at start.
• Setting
Setting
Function
constant
Disabled
0
(The motor with excessive load is possibly stalled. Then a longer
acceleration time and reduced load is required.)
1
Enabled
• When setting 1 is selected, acceleration is stopped if the motor current
exceeds the acceleration stall prevention level(P2.02). Acceleration is
started again when the current falls below this level. The actual
acceleration time can be longer than the set value (at F2.01) depending
on the load.
5.8.3.2 Stall prevention level at start : P2.02
Parameter
Name
Unit
No.
Stall
P2.02
Prevention
1%
Level at Start
• P2.02 can be used to set the output current limit level as a percentage of
rated current of the inverter at start.
(i.e. 100% corresponds to the rated current of the inverter)
• This setting is valid when P2.01 is let to 1.
• Normally it isn't necessary to change this setting.
5. Parameters
5-65
Changeable
Setting
Factory
during
range
Setting
operation
0~1
1
X
Changeable
Setting
Factory
during
range
Setting
operation
0~200
170
O
MOSCON-E7 User's Manual
5-66
• Decrease this setting when:
- The motor capacity is small compared to the inverter capacity
- Stall occurs when the motor is operated with the factory setting
Output
current
Output
frequency
Figure 5.25 Acceleration Stall Prevention function : P2.01=1
5.8.3.3 Stall prevention limit during acceleration : P2.03
Parameter
Name
Unit
No.
Stall
P2.03
Prevention at
1%
Acc. Limit
• P2.03 can be used to set the stall prevention limit when high-speed
motor is being used in the high-speed range
(the high frequency range above the base frequency)
• Normally it isn't necessary to change this setting.
• The standard target setting is the motor's rated current.
• Set P2.03 as a percentage of the inverter's rated current.
(i.e. 100% corresponds to the inverter's rated current)
Acceleration stall
prevention level
C0.01
Base frequency (FA)
Figure 5.26 Stall prevention limit during acceleration
P2.02
(Acceleration stall prevention level)
Time
The output frequency is
controlled to prevent stall
Time
Changeable
Setting
Factory
during
range
Setting
operation
0~100
50
O
P2.02
(Acceleration stall
prevention level)
P2.03
(Acceleration stall
prevention limit)
Output frequency
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