Kohler Curtis AC F2-T User Manual

6 — COMMISSIONING
Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022 Return to TOC
pg. 182
Note that the base_speed_capture test restarts each time the motor comes to a stop and the
throttle is released, so be sure to note the value before re-accelerating the motor.
If the Motor Type or the low speed current limit are changed aer performing the initial
setup procedures, the FW Base Speed parameter also needs to be reset.
For example, if lowering the Drive_Current_Limit or PL_Drive_Nominal, retest and reset
this parameter.
16. Run the Field Weakening test.
is test will enable the choice between a more ecient (less torque) or more torque (less
ecient) operation above the base speed, by adjusting the Field Weakening Drive parameter.
Programmer: Motor Setup » Induction Motor (ACIM) » Field Weakening » Field Weakening Drive.
Note: The present Field Weakening Drive value (0%) was determined by the above
autocharacterization routine, and is not the default value (100%) in the native OS intended for
the Curtis dynamometer-characterized motors when a motor type (number) is utilized. e
dierences are:
Auto-Characterized: Field Weakening Drive is adjusted UP from 0% to the max Field
Weakening Drive determined in this test.
Dyno-Characterized: Field Weakening Drive is adjusted DOWN from 100% (can be set from
0–100%).
Increasing this parameter toward 100% will progressively allow more torque (along with more
current) at high motor speeds, but increasing it too much will actually reduce torque while
still drawing a great deal of current. e auto-characterization value of 0% will give the most
ecient motor operation, but will not give the highest torque at high speeds.
If more torque is required at high speeds, run this Field Weakening Drive test. is test will
use these items:
Programmer: Application Setup » Vehicle » Speed/Dist/Accel » Performance Metrics » Capture Speed 1, 2.
Programmer: System Monitor » Vehicle » Speed/Dist/Accel » Performance Metrics » Time Between Speeds.
Set Capture Speed 1 and 2 to values that are close to the Max Speed setting. e Capture Speed
1 and 2 values MUST be set higher than the measured FW Base Speed in step 15 (because Field
Weakening only aects performance at speeds above the “base speed”). Ideally, the Capture
Speed 1, 2 values should be above the second corner point of the motor torque – speed curve.
For example, if the Max Speed is set to 4000 rpm, set Capture Speed 1 = 3500 rpm and Capture
Speed 2 = 3800 rpm:
Programmer: Speed Mode Express » Max Speed.
Programmer: Speed Mode » Speed Controller » Max Speed.
Programmer: Torque Mode » Speed Controller » Max Speed.
From a stop, apply full throttle to accelerate to a speed greater than Capture Speed 2. Note
(write down) the value displayed for Time Between Speeds (Time_Between_Capture_Speeds).
e test progression is to minimize this time.
Now increase the Field Weakening Drive setting and repeat the acceleration in the same
direction, with the same load, and with the same full throttle and again note the Time Between
Speeds value.

Kohler Curtis AC F2-T Specifications

General

Brand	Kohler
Model	Curtis AC F2-T
Category	Controller
Language	English