Filter
Top Products
18/24 BCN-C22005-634
2 Voltage reduction selection during stall prevention operation (Pr.154)
(1) To further prevent a trip (Pr. 154)
When Pr. 154 is set to "0, 10", the output voltage reduces during stall prevention operation. By making this
setting, an overcurrent trip becomes less likely to occur. Use this function when torque reduction does not pose
a problem.
Set Pr.154 = "10, 11" when the overvoltage protective function (E.OV) activates during stall prevention
operation in an application with large load inertia. Note that turning OFF the start signal (STF/STR) or
varying the frequency signal during stall prevention operation may delay the acceleration/deceleration
start.
(2) Causes and corrective actions
The setting values "10 and 11" are added for Pr.154 Voltage reduction selection during stall prevention operation.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
154
Voltage reduction selection
during stall prevention
operation
1
0
With voltage
reduction
You can select whether to use
output voltage reduction during
stall prevention operation or not.
1
Without voltage
reduction
10
With voltage
reduction
Use these settings when the
overvoltage protective function
(E.OV) activates during stall
prevention operation in an
application with large load inertia.
11
Without voltage
reduction
Operation Panel
Indication
E.OV1
FR-PU04
FR-PU07
OV During Acc
Name
Regenerative overvoltage trip during acceleration
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be
activated by a surge voltage produced in the power supply system.
Check point
· Check for too slow acceleration. (e.g. during descending acceleration with lifting load)
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.
Check if the stall prevention operation is frequently activated in an application with a large
load inertia.
Corrective action
· Decrease the acceleration time.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). ( Refer to Chapter 4 of the Instruction
Manual (Applied).)
· Set a value larger than the no load current in Pr. 22 Stall prevention operation level.
Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". ( Refer to
Chapter 4 of the Instruction Manual (Applied).)
Operation Panel
Indication
E.OV2
FR-PU04
FR-PU07
Stedy Spd OV
Name
Regenerative overvoltage trip during constant speed
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be
activated by a surge voltage produced in the power supply system.
Check point
· Check for sudden load change.
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.
Check if the stall prevention operation is frequently activated in an application with a large
load inertia.
Corrective action
· Keep load stable.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). ( Refer to Chapter 4 of the Instruction
Manual (Applied).)
· Use the brake unit or power regeneration common converter (FR-CV) as required.
· Set a value larger than the no load current in Pr. 22 Stall prevention operation level.
Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". ( Refer to
Chapter 4 of the Instruction Manual (Applied).)
V/F
V/F
V/F
Magnetic fluxMagnetic fluxMagnetic flux
V/F
V/F
V/F
Magnetic fluxMagnetic fluxMagnetic flux
bcnc22005634.fm 18 ページ ２０１２年７月３日 火曜日 午前９時４３分