Using Inverters for Elevating Machines
6-175
4. Use the ASR constants (C5-01 to C5-05) in their factory settings when using V/f control with PG (A1-02 = 1). Vibration may occur if these constants
are changed greatly from their factory settings.
5. The torque and speed response of high-resistance (high-slip) motors are insufficient. Use appropriate adjustments to improve them. On the contrary,
low-resistance (low-slip) motors are easily subject to hunting and vibration. Here too, use appropriate adjustments to improve them.
6. The current during startup may increase when C4-02 (Torque compensation primary delay time constant) is increased. Check the current during star-
tup while adjusting this constant.
îš‹ Reducing Shock during Elevating Machine Start, Stop, Acceleration, and
Deceleration
When the riding comfort during start, stop, acceleration, and deceleration is of high importance, as it is for ele-
vators in which people ride, adjust the following constants.
îš„S-curve Characteristics, Acceleration/Deceleration Times
îš„Dwell Function at Start
IMPORTANT
1. The factory setting for C2-04 (S-curve characteristic time at deceleration end) is 0.00 second, while the fac-
tory setting for all other S-curve characteristic times is 0.20 second. Make appropriate settings for the
accel/decel times and S-curve characteristic times at each point. (S-curve characteristic time = Approxi-
mately 0.2 to 1.0 second)
2. The accel/decel rate can be automatically switched during acceleration and deceleration by using C1-11
(Accel/decel time switching frequency). (Factory setting: Disabled)
Output frequency ≥ set frequency: C1-01, C1-02 accel/decel times
Output frequency < set frequency: C1-07, C1-08 accel/decel times
3. If the output frequency during the S-curve characteristic time for deceleration falls below the value set for
E1-09 (Min. output frequency), the S-curve characteristic will be cancelled, and the DC injection braking
(Zero-speed control) will be applied.
4. Do not use the S-curve characteristic for applications where a short run time is desired, such as in cranes
and hoists. (S-curve characteristic time = Approximately 0.0 to 0.2 second)
C2-03
C2-02
(High speed)
Output frequency
C2-03
C2-04
C2-04
C2-01
Acceleration time
Deceleration time
(Low speed)
DC injection braking when stopping
(Zero-speed control for flux vector control)
b6-02
(Dwell time at start)
0.1 to 0.3 sec
(High speed)
ON
OFF
CLOSE
OPEN
t
Output frequency
b6-01 (Dwell frequency at start) 0.1 to 3.0 Hz
Frequency detection
2 or During run 2
Holding brake
operation
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