Curtis 1243GEN2 Manual
44
The 1243
GEN2 controller can protect the motor from damage due to overtemperature
by cutting back the motor speed. An estimate of the motor temperature is derived from
the resistance of the field winding. The controller measures field current, field PWM,
and battery voltage, and uses these measurements to calculate the instantaneous field
resistance. This value is filtered and compared to two setpoints: Motor Warm
Resistance and Motor Hot Resistance. If the field resistance reaches the Motor Warm
Resistance setpoint, the motor maximum speed will be limited to the programmed
Warm Speed. If the field resistance reaches the Motor Hot Resistance setpoint, the
controller will no longer drive but all braking functions will remain active. If this
motor protection feature is not desired, it can be disabled by programming the motor
resistance compensation parameter Off.
WARM SPEED
The warm speed parameter defines the maximum drive speed output when the
motor field resistance is at or above the Motor Warm Resistance setpoint. The
warm speed is adjustable from 0 to 100% of drive output.
MOT WRM x10 mΩ
The motor warm resistance parameter defines the field resistance setpoint at
which a motor warm fault will occur and the maximum speed will be controlled
by the Warm Speed setting.
Note: The parameter value is in ten-milliohm units. If you want to program
the Motor Warm Resistance setpoint to 900 mΩ (0.9 Ω), you would enter 90
for the MOT WRM x10 mΩ value. The Motor Warm Resistance setpoint is adjust-
able from 100 mΩ (MOT WRM x10 mΩ =10) up to the Motor Hot Resistance
setpoint.
MOT HOT x10 mΩ
The motor hot resistance parameter defines the field resistance setpoint at
which a motor hot fault will occur and no drive output will be allowed. It is
adjustable from the Motor Warm Resistance setpoint up to 2500 mΩ (2.5 Ω).
The value entered is in ten-milliohm units, which means the maximum Motor
Hot Resistance value is one-tenth of 2500 (i.e., MOT HOT x10 m
Ω =250).
MOT Ω COMP
The motor resistance compensation parameter is used (programmed On) to
enable the motor overtemperature protection feature.
Motor Protection Parameters
3 — PROGRAMMABLE PARAMETERS:
Motor Protection Parameters
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