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Stop On Contact (pr. 275, Pr. 276) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

Transistorized inverter, high function & low acoustic noise.
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Note: 1. By increasing the Pr. 275 setting, the low-speed (stop-on-contact) torque increases, but the
overcurrent alarm (E.OCT) may occur or the machine may oscillate in a stop-on-contact state.
2. The stop-on-contact function is different from the servo lock function, and if used to stop or hold a
load for an extended period, the function can cause the motor to overheat. After a stop,
immediately reset this function and use a mechanical brake to hold the load.
3. Under the following operating conditions, the stop-on-contact function is made invalid:
·
PU operation
·
Programmed operation
·
PU + external operation
·
PID control function operation
·
Remote setting function operation
·
Orientation control function operation
·
Jog operation
<Setting>
1) Select advanced magnetic flux vector control and set "1" or "3" in Pr. 270.
2) Refer to the following list and set the parameters:
Parameter
Name
Number
Multi-speed setting (low
6
speed)
Second stall prevention
48
operation current
Stop-on-contact exciting
275
current low-speed
multiplying factor
Stop-on-contact PWM
276
carrier frequency
·
Function switch-over when stop-on-contact control is selected
Operation Mode (External)
Ordinary Operation
RL, RT terminals
RL
Either is OFF
Main function
Multi-speeds
Output frequency for a
0 to 5V, 0 to 10V
stop on contact
4 to 20mA
Stall prevention operation
Pr. 22 (stall prevention
level
operation level)
Exciting current low-speed
multiplying factor
Pr. 72 "PWM frequency
Carrier frequency
Fast-response current limit
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Setting
Set the output frequency for stop-on-contact control.
The frequency should be as low as possible (about 2Hz). If it is set
to more than 30Hz, the operating frequency will be 30Hz.
0 to 400Hz
When stop-on-contact control is to be exercised during PLG
feedback control, PLG feedback control is made invalid when the
inverter enters the stop-on-contact control mode.
0 to 200%
Set the stall prevention operation for stop-on-contact control.
Usually set a value between 130% and 180%.
0 to 1000%
Set the force (holding torque) for stop-on-contact control.
9999
No compensation
Set a PWM carrier frequency for stop-on-contact control.
0 to 15
(Valid at the frequency of 3Hz or less)
9999
Conforms to the Pr. 72 "PWM carrier frequency selection".
Stop-on-Contact Control
RT
RL
ON
Pr. 6 "low-speed frequency"
Pr. 48 (second stall prevention operation
current)
The current is compensated for by the
multiplying factor (0 to 1000%) set in
Pr. 275 before RL and RT are switched
on.
Pr. 276 (stop-on-contact PWM carrier
selection"
frequency)
(0 to 15)
(0 to 15, 9999)
Yes
162
PARAMETERS
Description
RT
Remarks
ON
When RL and RT are on,
Pr. 49 (second stall prevention
operation frequency) is invalid.
No

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