19
Operational Overview
Where:
T
TL
= Total Torque Limit
P
MT
= Peak motor torque
P
DT
= Peak drive torque
R
FL
= RMS foldback limit (80 percent of continuous system torque rating)
S
FL
= Stall foldback limit (80 percent of drive stall current rating)
P
TL
= Programmable
Torque Limit
Note
The Torque Limit Enable input must be active to use P
TL
.
If the application requires that the Torque Limit be enabled at all times, the Torque Limit
Enable input function may be setup to be Always Active to avoid the use of an input line.
Velocity Limiting
The drive commanded velocity is limited to 112.5% of the motor’s maximum operating
speed. This limiting has nothing to do with the Line Voltage setting. Depending on AC supply
voltage, it may or may not be possible to get to motor maximum operating speed.
Note
See the "Drive/Motor Specifications" section for maximum motor speeds.
Example 1:
If the Motor Type is an MG-316, the maximum motor speed of the MG-316 is 4000 RPM. If
the Line Voltage parameter is set to 230 VAC and the Velocity Limit is equal to 112.5 percent
of 4000 RPM or 4500 RPM.
Example 2:
If the Motor Type is an MG-316, the maximum motor speed of the MG-316 is 4000 RPM. If
the Line Voltage parameter is set to 115 VAC, the Velocity Limiting Active output will never
come on.
Overspeed Velocity Parameter
Motor speed is continuously monitored against the Overspeed Velocity parameter whether
the drive is enabled or not and when the motor speed exceeds the limit, or Overspeed Velocity
Limit, a fault is issued. The default value for Overspeed Velocity Limit is 13000 RPM.
The drive has an internal overspeed velocity limit. This limit is the maximum of the
Overspeed Velocity parameter and 150% of the motor maximum operating speed. For
example, an MG-316 with 4000 RPM maximum speed the internal limit is 6000 RPM.
The Overspeed fault will be activated when either one of these two conditions are met:
1. When the actual motor speed exceeds the Overspeed Velocity Limit parameter.
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Содержание Control Techniques EN Series
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