Wesley BC-620-4CA - Manual (Page 66)

62 Curtis 1234/36/38 Manual,
OS
11
3 — PROGRAMMABLE PARAMETERS: Field Weakening Control and Motor Type Parameters
MOTOR TYPE PARAMETER
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Motor Type 0–200 This parameter references a predefined table of motor parameters for many
Motor_Type 0–200 AC motors. Consult your local Curtis customer support engineer for
information on how to set this parameter based on your application and
motor.
FIELD WEAKENING CONTROL MENU
ALLOWABLE
PARAMETER RANGE DESCRIPTION
FW Base Speed 200–6000 rpm This parameter needs to be reset each time the Motor Type is changed
FW_Base_Speed 200–6000 or the low speed current limit is changed. For example, if you lower
Drive_Current_Limit (page 39) or PL_Drive_Nominal (page 40), you
should consider adjusting this parameter.
To determine the correct value, perform this tuning test. The test
should be run with batteries that have a reasonable charge. In either
Torque Control Mode or Speed Control Mode, set your accel rates to be
fast—so that you’ll be accelerating at full current during the test. Next,
set the Base Speed parameter to the maximum value (so that it will not
interfere with the test result). From a stop, apply full throttle and accelerate
to high speed and then stop. After stopping, note the value displayed in
Monitor
» Controller » Motor Tuning » Base Speed Captured, and enter this
value for the Base Speed setting.
The test restarts each time the vehicle comes to a stop and the
throttle is released, so be sure to note the value before driving away.
Field Weakening 0–100 % Determines the amount of high speed power the controller will allow,
Field_Weakening 0–1024 while still maintaining maximum effficiency at the allowed power. Reducing
this parameter effectively reduces controller current at high speeds, which
can reduce energy consumption and motor heating, but at the expense of
reduced available torque from the motor.
Weakening Rate 0–100 % Determines the control loop gains for field weakening. Setting the rate too
Field_Weakening_Rate 0–500 low may create surging in the vehicle as it accelerates at mid to high
speeds. Setting the rate too high may create high frequency oscillations
(usually audible) when the vehicle accelerates at mid to high speeds.
MOTOR CHARACTERIZATION TESTS MENU
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Contact your Curtis customer support engineer if you will be running the motor
characterization tests yourself. See Initial Setup, step bl, page 79.