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Configuration
Controller heatsink / motor cooling fan
An external fan to cool the controller heatsink or a motor may be connected to one of the
analogue outputs. The fan will be turned on by the controller when either the heatsink
temperature or the motor temperature exceed a specified temperature. The fan turns off when
the nominated temperature is cold. The temperatures at which the fans should turn on and off,
the analogue output to use for the fan, the fan voltage and the temperature source (heatsink or
motor) can be programmed using the heatsink fan object (5A01
). Note that the contactor driver
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outputs may be damaged if connected to capacitive loads. It is quite common for fans to
incorporate capacitive elements, in which case a relay should be used to isolate the fan from the
contactor driver output.
NOTE: The temperature set-point to turn on the fans should be higher than the set-point to turn
off the fans
The fans will not operate if another function is configured to run on the specified analogue
output.
Motor over-temperature protection
The controller protects motors from over-temperature. It maintains a motor temperature estimate
and can also accept a direct temperature measurement via an analogue input (for a thermistor)
or a digital input (for an over-temperature switch).
The temperature estimate is calculated by monitoring current to the motor over time. The
estimate is configured at 4621
.
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The estimate is always applied, since it can detect increases in motor temperature more quickly
than the direct measurement. Direct measurement is normally done on the motor casing, which
lags behind the internal temperature.
Additional protection is provided for thermistor wire-off conditions. If the temperature sensor
input measures a completely short circuit or open circuit signal, then the output torque will begin
to reduce gradually over time. A recovery rate can also be specified should the signal become
valid again. This means that wire-off situations, should they occur during drive, do not result in
an instant loss of torque. Both the torque ramp down and recovery rates can be configured using
object 4620
.
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Motor over-speed protection
A facility to protect the motor or vehicle power train due to damage by overspeeding is available
on the controller. A maximum speed can be configured at object 4624
. Under normal operation
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the controller should output braking torque to prevent the overspeeding initially, if the measured
speed exceeds this limit then the controller will shut down and a fault will be set.
CAUTION: The trip speed offers a final level of protection for the vehicle mechanics, and
should be set to a minimum level that would not be expected to be reached under normal
operation.
Battery protection
The nominal battery voltage must be set at 2C00
.
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Over voltage
Battery over voltage usually occurs during regenerative braking.
Doc. # 177/52701
6-37
Rev. 3.3
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