Curtis 1238SE - Page 94

8A — AUTOMATED ACIM MOTORCHARACTERIZATION PROCEDURE
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017 Return to TOC
pg. 90
16. Run the Field Weakening test.
is test will enable you to decide between a more ecient (less torque) or more torque (less
ecient) operation at high speeds, by adjusting the hydraulic motor’s Field Weakening Drive
parameter. While the most ecient operation will occur with eld weakening at the 0% auto-
characterization value, more torque at high speeds may be required, necessitating adjusting the
eld weakening. Field Weakening Drive should be set just high enough to meet the high speed
performance specications, typically maximum li speed with full load.
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 test.
Dyno Characterized: Field Weakening Drive is adjusted DOWN from 100% (can be set from 0–100%)
Increasing the Field Weakening Drive parameter toward 100% will progressively allow more
torque (along with more current) at high motor speeds, but increasing it too much will actually
reduce performance while still driving a great deal of current.
On the 1313 programmer, add these two items to the Favorites shortcut so you can easily toggle
between them:
Monitor » Controller » Motor Tuning » Motor RPM
Parameter (Program) » Motor » Control Algorithms » 0-ACIM » Field Weakening Control » Field Weakening Drive.
Run this test with no load on the forks. Work with only the rst stage of a multistage mast. Work
quickly to avoid overheating the controller or motor.
Using the application’s Speed (control) Mode, set the Max Speed parameter to a high speed that
likely cannot be achieved by the hydraulic system.
Set Field Weakening Drive = 100% (note: this test work works DOWN from 100% to nd the
actual maximum value).
Apply full throttle, running the motor towards the maximum speed. Record the maximum
(achieved) Motor RPM.
Repeat the acceleration runs while continuing to lower the Field Weakening Drive value before
on each run until you notice the achievable maximum motor speed fall o signicantly (20–30
rpm). is number represents the maximum Field Weakening Drive value (%) to achieve the
maximum torque/speed envelope of the hydraulic motor (do not use a higher percentage). You
can always reduce the Field Weakening Drive percentage to reduce energy consumption and
improve eciency (but reducing torque output) at high speeds.
NOTE: The Field Weakening Drive setting will have no effect at motor speeds below FW
Base Speed.
17. Return to Chapter 6 and complete Initial Setup steps 12 through 14.
Quick Links:
Motor RPM p.76
Field Weakening Drive p.56
Max Speed
Express Mode p.31
Speed Mode p.32