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The Light-load function is reset by one of the conditions shown below. Once reset, the drive will accelerate until the load
is checked again as described in (1).
・
when the Run Command relay is open
・
when the Frequency Reference Input Value is below the Light-load 1 Detection Frequency (FAD)
・
when a malfunction occurs
・
when a reverse run command is input
・
when an External Baseblock Command has been entered
Light-load 1 Torque Bias (S4-19, -20) Adjusting
Open Loop Vector Control Mode
・
When lowering a load (reverse), Light-load 1 function is not executed becomes of the mechanical loss for the crane,
even if the load doesn’t reach Light-load 1 Detection level (REV).
・
When hoisting (FWD), Light-load 1 Detection Level (S4-04) has been added onto the value for mechanical loss, thus
making it possible to skip Light-load 1 Torque Bias (S4-19) when tuning the drive.
・
Also, if the motor temperature changes, even an identical load may undergo and then not undergo Light-load (an error
of approximately 5%~7%) due to the value of the torque reference changing. Keep this in mind when setting this
parameter.
Light-load 1 Torque Bias (FWD) (S4-19) Adjusting Range
(1) When rotating forward without a load, the drive runs at the Light-load Detection Frequency (S4-06), and the torque
reference is monitored in U1-09.
(2) A value opposite of the signal from monitor U1-09 is set to parameter S4-19.
(3) While using U1-48 to monitor the torque reference for Light-load, adjust the Light-load 1 Detection Level (S4-04).
Light-load 1 Torque Bias (REV) (S4-20) Adjusting Area
(1) When rotating in reverse without a load, the drive runs at the Light-load Detection Frequency (S4-06), and the torque
reference is monitored in U1-09.
(2) A value opposite of the signal from monitor U1-09 is set to parameter S4-20.
(3) While U1-48 monitors the torque reference for Light-load, S4-05 is tuned (Light-load 1 Detection Level).
Note-1: Areas of caution when setting parameters:
(1) Set parameters so that the following conditions are met.
S4-06 (FAD: Acceleration 1 Detection Frequency) = S4-02 (FAMF: FWD Acceleration 1 Max Frequency)
S4-03 (FAMR: REV Acceleration 1 Max Frequency) = E1-04 (Max Output Frequency: E4-01 when switching motors)
(2) If FAMF (or FAMR when in reverse) is smaller than FAD, then the drive will decelerate when Light-load 1
functions are activated.
(3) The operational frequency reference will be set to the smaller of either the Light-load Max Frequency
(FAMF/FAMR), or the present frequency reference once Light-load is complete.
Note-2: The distance the crane travels before stopping via the Run Command being switched off is determined by the
speed of the crane.
When running at high speeds, be sure to provide enough room when removing the Run Command.
Note-3: The output current may increase following Light-load operations.
6.4.2 Light-load Acceleration 2 Function
If the acceleration time is set low, the drive will start automatically increasing the acceleration rate, or halting the
acceleration above base speed. To protect the load (mainly braking) to limit the kinetic energy and operate at
maximum efficiency.
Light-load 2 allows the drive to determine whether to accelerate or not up to the frequency provided, and operates
the drive at the frequency reference provided when Light-load is enabled. In the same way, if Light-load 2 is enabled,
then let the frequency reference be the command following Light-load operations. Refer to “Appendix 1: Parameter
Calculations” when making parameter adjustments.
When switching to enable or disable Light-load 2, set one of the Multi-Function Input terminals to 36 (parameters
H1-01~05). If normally enabled, then S4-01 (Light-load Function Selection) should be set to "2".
Содержание CIMR-F7Z
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