Load Torque High Speed Frequency Control; Stop-On Contact Control - Mitsubishi Electric FR-A700 Manual

Pr.
Pr.
270 to 274, 4, 5

Load torque high speed frequency control

Pr.270 Stop-on contact/load torque high-speed frequency control selection
Pr.271 High-speed setting maximum current
Pr.272 Middle-speed setting minimum current
Pr.274 Current averaging filter time constant
Pr.5 Multi-speed setting (middle speed)
This function is designed to increase speed automatically under
light load, for example to minimize the incoming/outgoing time in a
multi-story parking lot.
More specifically, the magnitude of the load is judged according to
the average current at a certain time after starting to perform
operation at higher than the preset frequency under light load.
Pr.270 Setting
0 Without stop-on contact control and load torque
(initial value) high-speed frequency control
1

Stop-on contact control

2 Load torque high speed frequency control
Stop-on contact + load torque high speed
3
frequency control
Set "2 or 3" in Pr.270 to set the current value, averaging range, etc
when the load torque high speed frequency control is selected.
When the X19 signal (load detection high-speed frequency function
selection) is turned on to start operation, the inverter automatically
varies the maximum frequency between Pr.4 Multi-speed setting (high
speed) and Pr.5 settings according to the average current flowing
during acceleration from half of the frequency of the Pr.5 Multi-speed
setting (middle speed) setting to the frequency set in Pr.5.
Pr.4
(120Hz)
Pr.5
(60Hz)
Pr.271
(50%)
Frequency relative to the average current
Pr. Setting
Number Range
4 0 to 400Hz Set the higher-speed frequency.
5 0 to 400Hz Set the lower-speed frequency.
271 0 to 220%
Set the upper and lower limits of the current at
high and middle speeds.
272 0 to 220%
Average current during acceleration from
0 to 400Hz
(Pr.273
achieved.
273
Average current during acceleration from (Pr.5
9999
×
Set the time constant of the primary delay filter
relative to the output current.
(The time constant[ms] is 0.75
274 1 to 4000
the factory setting is 12ms.)
A larger setting provides higher stability but
poorer response.
63
When setting parameters, refer to the instruction manual (applied) and understand instructions.
Pr.273 Current averaging range
Pr.4 Multi-speed setting (high speed)
Description
Pr.272
Average current
(100%) Value in parenthesis is initial value
Description
×
1/2)Hz to (Pr.273 )Hz can be
1/2)Hz to (Pr.5)Hz is achieved.
×
Pr.274 and
Pr.
Pr.
270, 275, 276, 6
Stop-on contact control
Pr.270 Stop-on contact/load torque high-speed frequency control selection
Pr.275 Stop-on contact excitation current low-speed multiplying factor
Pr.276 PWM carrier frequency at stop-on contact
To ensure accurate positioning at the upper limit etc. of an elevator,
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.
Pr.270 Setting
0 Without stop-on contact control and load torque
(initial value) high-speed frequency control
1 Stop-on contact control
2 Load torque high speed frequency control
Stop-on contact + load torque high speed
3
frequency control
Select either real sensorless
vector control or advanced
magnetic flux vector control.
When both the RT and RL
signals are switched on, the
inverter enters the stop-on
contact mode, in which
operation is performed at
the frequency set in Pr.6
Multi-speed setting (low
speed) independently of the
preceding speed.
Pr. Setting
Number Range
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
6 0 to 400Hz operating frequency will be 30Hz.
When performing stop-on-contact control
during encoder feedback control, encoder
feedback control is made invalid due to a mode
shift to the stop-on-contact control mode.
Set the stall prevention operation level for stop-
on-contact when using under advanced
48 0 to 200% magnetic flux vector control.
(Use the Pr.22 setting value under real
sensorless vector control.)
Usually set a value between 130% and 180%.
0 to 1000% Set the force (holding torque) for stop-on-
275
contact control.
9999 No compensation.
Set a PWM carrier frequency for stop-on-
contact control.
For real sensorless vector control, carrier
0 to9/0 to 4
frequency is always 2kHz when a setting value
*
276
is 0 to 5 and always 6kHz when a setting value
is 6 to 9.
(Valid at the output frequency of 3Hz or less.)
9999 As set in Pr.72 PWM frequency selection.
* Differ according to capacities. (55K or less/75K or more)
Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless
Pr.6 Multi-speed setting (low speed)
Description
Normal mode Stop-on contact
control mode
Pr.4
Pr.5
Pr.6
0 Time
(a) (b) (c)
RH ON
RM
OFF ON
RL OFF ON
*
RT
OFF ON
Goes into stop-on-contact control mode when
both RL and RT switch on.
*RL and RT may be switched on in any order
with any time difference
(a):Acceleration time (Pr.7)
(b):Deceleration time (Pr.8)
(c):Second deceleration time (Pr.44)
Description