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(14) Stall Prevention Selection During Acceleration
(Sn-14)
Sn-14 = 0 : Disabled (Accelerate according to the setting. Stall may occurs with
large load)
= 1 : Enabled (Stop acceleration if Cn-25 setting is exceeded. Accelerate
again when current recovers)
•
Please refer to “Stall prevention level during acceleration” on page 53.
(15) Stall Prevention Selection During Deceleration
(Sn-15)
•
If external braking resistor unit is installed, the Sn-15 setting must be disabled (Sn-
15= 0).
•
If no external braking resistor unit is installed, the inverter can provide about 20%
regenerative braking torque. If the load inertia is so large that it exceeds the
regenerative braking torque, the parameter Sn-15 is set as “1”. When setting Sn-
15= 1 (enabled) is selected, the deceleration time (Bn-02 or Bn-04) is extended so
that a main circuit overvoltage does not occur.
Output
Frequency
time
Deceleration time is extended
to avoid overvoltage trip
Deceleration Time (setting value)
Fig. 35 Stall prevention function during deceleration (Sn-15= 1)
(16) Stall Prevention Selection during Running(Sn-16)
Sn-16 = 0 : Disabled (Stall may occur when a large load is applied)
= 1 : Enabled (Deceleration will start if the motor current is larger than the
stall prevention level during running and continues for more than
100ms. The motor is accelerated back to the reference frequency again
when the current falls below this level Cn-26).
•
Please refer to “Stall prevention level during running” on page 53.
(17) Operation Selection at Fault Contact during Fault Retrying (Sn-17)
Sn-17 = 0 : Do not output fault restart. (The fault contact does not work)
= 1 : Output fault restart. (The fault contact operates)
•
Please refer to “Number of auto restart attempt” on page 52.
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