Stop-On-Contact, Load Torque High-Speed Frequency Selection (Pr. 270) - Mitsubishi Electric FR-A520-2.2K Instruction Manual

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Stop-on-contact, load torque high-speed frequency selection (Pr. 270)

Pr. 270 "stop-on-contact, load torque
high-speed frequency selection"
To ensure accurate positioning at the upper limit etc of a lift, stop-on-contact control causes a mechanical
brake to be closed while the motor is developing a holding torque to keep the load in contact with a
mechanical stopper etc.
This function suppresses vibration which is liable to occur when the load is stopped upon contact in vertical
motion applications, ensuring steady precise positioning.
Load torque high-speed frequency control automatically sets the maximum operating frequency according to
the load.
Specifically, the weight of the load is determined after a start by the average current at a given time; when the
load is light, the preset frequency can be increased for operation.
When the load is light, speed can be automatically increased in a sky parking lot, for example, to reduce
incoming and outgoing times.
Using Pr. 270, select stop-on-contact control and/or high-speed frequency control (control which
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automatically switches between high- and middle-speed operations according to load torque).
·
When stop-on-contact control is selected, select advanced magnetic flux vector control. For function
details, refer to Pr. 275 and Pr. 276.
·
For function details of load torque high-speed frequency control, refer to Pr. 271 to Pr. 274.
Parameter Factory
Setting Range
Number Setting
270 0
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0 Without stop-on-contact control and load torque high-speed frequency control
1 Stop-on-contact control
2 Load torque high-speed frequency control
3 Stop-on-contact control and load torque high-speed frequency control
156
PARAMETERS
Related parameters
Pr. 271 "high-speed setting maximum
current"
Pr. 272 "mid-speed setting minimum
current"
Pr. 273 "current averaging range"
Pr. 274 "current averaging filter
constant"
Pr. 275 "stop-on-contact exciting current
low-speed multiplying factor"
Pr. 276 "stop-on-contact PWM carrier
frequency"
Description