Installation and Operation Guide
ED-DT318B
Drive Train Systems with Traction Control, Inverter/Controller, and Motor with 2 Speed Transmission
BC353060341319en-000101
Revision D
© Danfoss | November 2020 | 138
Classified as Business
Column Label
Description
Desired Torque (Nm)
This is the amount of torque, in Newton meters, that the controller intends to
produce. This column may differ from the
Requested Torque
column due to CAN
limits or safety limitations. For example, if the user requests a large value of
forward torque, but the motor is already spinning at its forward speed limit, the
desired torque will be reduced to avoid exceeding the speed limit. Furthermore,
the value in the
Desired Torque
column may differ slightly from the value in the
Actual Torque
column because the desired torque is the amount of torque that
the motor intends to produce, whereas the actual torque is determined from
measurements and best reflects the torque that the motor is truly producing.
Requested Speed
(RPM)
This is the speed requested by the user, in revolutions per minute. The values
reported in this column come directly from the received CAN speed commands.
This is useful in debugging because it allows the user to check whether the CAN
commands contained the correct values and were received by the controller. In
contrast, the Desired Speed column reports the target speed of the controller,
after applying safeties and limits to the requested value.
Desired Speed (RPM)
This is the speed that the controller aims to maintain, in revolutions per minute. If
the controller is not in speed control, this number is meaningless. This column
may differ from the
Requested Speed
column due to CAN limits or safety
limitations. For example, if the torque limits in the CAN speed command are too
restrictive, the controller will be unable to maintain the desired speed, and as a
result the desired speed would be less than the requested speed. Note that the
Speed
and
FilteredSpeed
columns report the actual, measured speed of the motor,
whereas
Desired Speed
reports the controller’s target speed.
Desired Voltage (V)
The requested voltage demand in volts. If the inverter is not in voltage control,
this number is meaningless.
Motoring Limit (%)
If any limits are acting on any motoring torque demand, this is a value below
100%.
Regen Limit (%)
If any limits are acting on any regeneration torque demand, this is a value below
100%.
HighestTorqAllowed
(Nm)
The maximum motoring torque allowed at this moment. This value is affected by
many limits (voltage, temperature, etc.) and command limits. Those limits are
reflected by the Motoring Limit percentage.
LowestTorqAllowed
(Nm)
The maximum regeneration torque allowed at this moment. Affected by many
limits (voltage, temperature, etc.) and command limits. Those limits are reflected
by the Regen Limit percentage.
Highest Power Allowed
(kW)
The maximum motoring power allowed at this moment.
Lowest Power Allowed
(kW)
The maximum regeneration power allowed at this moment
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