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F3-14 (Zero-speed control time at startup) specifies the time from output of the RUN
contactor to output of the brake contactor, during which the controller performs excitation on
the motor and outputs zero-speed current with large startup torque.
F3-15 (Brake release delay) species the time from the moment when the system sends
the brake release command to the moment when the brake is completely released, during
which the system retains the zero-speed torque current output.
F3-16 (Zero-speed control time at end) specifies the zero-speed output time when the
running curve ends.
F8-11 (Brake apply delay) species the time from the moment when the system sends the
brake apply command to the moment when the brake is completely applied, during which
the system retains the zero-speed torque current output.
The release time of the brakes varies according to the types and the response time of the
brakes is greatly influenced by the ambient temperature. A high brake coil temperature
slows the brake responsiveness. Thus, when the riding comfort at startup or stop cannot
be improved by adjusting zero servo or load cell compensation parameters, appropriately
increase the values of F3-15 and F8-11 to check whether the brake release time inuences
the riding comfort.
Function Code Parameter Name Setting Range Default Remarks
F8-01
Pre-torque
selection
0: Pre-torque invalid
1: Load cell pre-torque
compensation
2: Automatic pre-torque
compensation
0
Set this parameter
based on actual
requirement.
F2-11
Zero servo current
coefcient
0.20%–50.0% 15.0%
These are zero-
servo regulating
parameters when
F8-01 is set to
2 (Automatic
pre-torque
compensation).
F2-12
Zero servo speed
loop KP
0.00–2.00 0.50
F2-13
Zero servo speed
loop KI
0.00–2.00 0.60
When F8-01 is set to 2 (Automatic pre-torque compensation), the system automatically
adjusts the compensated torque at startup.
a. Gradually increase F2-11 (Zero servo current coefficient) until that the rollback is
cancelled at brake release and the motor does not vibrate.
b. Decrease the value of F2-11 (Zero servo current coefcient) if the motor jitters when
F2-13 (Zero servo speed loop TI) is less than 1.00.
c. Motor vibration and acoustic noise indicate excessive value of F2-12 (Zero servo speed
loop KP). Decrease the default value of F2-12.
d. If the motor noise is large at no-load-cell startup, decrease the value of F2-12 or F2-13.