Emerson Epsilon Eb Series Reference Manual page 55

Epsilon Eb and E Series EN Drives Reference Manual
Travel limit. The stored command pulses can also be cleared by activating both Travel Limit
input functions at the same time, activating the Stop input function or disabling the drive for
as little as 5 msec (plus any debounce time).
Torque Limiting
The Torque Command is calculated as shown previously, but its value is limited by the
Torque Limit parameter and the current foldback function (see "Torque Limit" and "Current
Foldback"). The result of this limiting function is Torque Command Actual. This is the
command that drives the Power Stage to generate current in the motor. The Torque Limit
Active output function is active whenever the Torque Command Actual is less than from the
Torque Command. This will be true when motion is stopped due to a Travel Limit input
function.
Torque Limit Function
The Torque Limit Enable input function allows an external controller to limit the Actual
Torque Command to a lower value. The Torque Limit parameter is active only when the
Torque Limit Enable input function is active.
=
T P ,
TL MT
Where:
T = Total Torque Limit
TL
P = Peak motor torque
MT
P = Peak drive torque
DT
R = RMS foldback limit (80 percent of continuous system torque rating)
FL
S = Stall foldback limit (80 percent of drive stall current rating)
FL
P = Programmable Torque Limit
TL
Note
The Torque Limit Enable input must be active to use P
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.
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P , R , S or P (whichever
DT FL FL TL
is lower)
.
TL