L3 Stall Prevention - YASKAWA E7N Technical Manual

L3 Stall Prevention

L3-01 Stall Prevention Selection During Accel
Setting
0 Disabled
1 General Purpose (factory default)
2 Intelligent
L3-02 Stall Prevention Level During Accel
Setting Range: 0 to 200% of Drive rated output current
Factory Default: 120% of Drive rated output current
The stall prevention during acceleration function adjusts the acceleration time in order to prevent OC fault trips during
acceleration. If L3-01= "0: Disabled", stall prevention is disabled. If the load is large enough and the acceleration time short
enough the Drive may fault and stop.
If L3-01= "1: General Purpose", then the standard stall prevention function is enabled. When the output current exceeds the
level set by the L3-02 parameter, the Drive will discontinue accelerating and maintain speed. If, during acceleration, the output
current comes within 15% of the level set by parameter L3-02, the acceleration time is lengthened. Once the output current
level has dropped below the L3-02 level, acceleration will begin again with the acceleration rate reaching the
programmed rate once again 15% below the L3-02 level.
-15%
Fig 5.30 Detailed Time Chart for Stall Prevention During Acceleration
If L3-01= "2: Intelligent", the intelligent stall prevention is enabled. The active acceleration time is ignored and the Drive will
attempt to accelerate as quickly as possible without exceeding the L3-02 output current level.
IMPORTANT
Stall Prevention during Acceleration is not effective when the output frequency is less than 6Hz.
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Description
Stall level during
acceleration
Output frequency
Output frequency is controlled
to prevent the motor stalling.
Programming 5 - 61
Output Current
Time
Time