Curtis Instruments AC F4-A User Manual

6 — COMMISSIONING
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 146
Note: The present Field Weakening Drive value (0%) was determined by the above auto-
characterization 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 text.
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
driving 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 »» Capture Speed 1, 2.
Programmer: System Monitor » Vehicle » Speed/Dist/Accel » 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 14 (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.
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.
Keep adjusting the Field Weakening Drive value and repeating the test until you find the
Field Weakening Drive value that results in the smallest Time Between Speeds. Use this Field
Weakening Drive value for applications that require the most torque at high speeds.
Some Field Weakening Drive settings may result in a test acceleration run where the Capture
Speed 2 cannot be obtained. ese Field Weakening Drive settings cannot provide enough torque
to get the vehicle past Capture Speed 2, and thus can be ignored.
Use the Field Weakening Drive setting that best matches the application. It will be somewhere
between 0% (most ecient, least motor heating) and the setting found in this test (highest torque
at high speeds).
Note: e Field Weakening Drive setting will have no eect at motor speeds below FW Base Speed.
16. Return to the Initial Setup section and complete step 22.
Quick Links:
Capture Speed 1/2 p.81
Time Between Speeds p.82
Field Weaking menu p.110-111
FW Base Speed
Base Speed Captured
Field Weakening Drive
Max Speed
SM Express p.40
Speed Mode p.40

Curtis Instruments AC F4-A Specifications

General

Brand	Curtis Instruments
Model	AC F4-A
Category	Controller
Language	English