Wesley BCT-6200-6SA - Manual (Page 52)

Curtis 1243
GEN
2 Manual, Rev. B 44
The 1243
GEN
2 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 m Ω value. The Motor Warm Resistance setpoint
is adjustable from 100 mΩ ( MOT WRM x10 m Ω =10) up to the Motor Hot Re-
sistance 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