Mitsubishi Electric FR-A700 Technical Manual page 215

2.6.3 Elevator mode [Pr. 61, 64, 292]
[Pr. ] Name
61 Reference current
Starting frequency for
64
elevator mode
Automatic acceleration/
292
deceleration
Operation matching a load characteristic of elevator with
counterweight can be performed.
Set 5 (stall prevention operation level 150%) or 6 (stall
prevention operation level 180%) in [Pr. 292 Automatic
acceleration/deceleration] to perform operation in the
elevator mode 1 or 2.
1) Control method
Sufficient torque is generated for the drive mode
load. For the regenerative load and no load, the
torque boost value is controlled with respect to the
[Pr. 0] setting as shown below to prevent an
overcurrent trip due to overexcitation.
Torque boost (%)
[Pr. 0 = 6 ]
3
Torque boost 0%
Regenerative
current
0
Torque boost characteristics
(when torque boost setting is 6%)
The starting frequency is factory-set to 2Hz, the stall
prevention operation level to 150% (or 180%), and
the base frequency voltage to 220V or 400V.
Normal
mode
Torque boost [Pr. 0]
Starting
[Pr. 13]
frequency
Base frequency
[Pr. 19]
voltage
Stall prevention
[Pr. 22]
operation level
Therefore settings of [Pr. 13 Starting frequency], [Pr.
19 Base frequency voltage], and [Pr. 22 Stall
prevention operation level] are ignored.
The elevator modes 1 and 2 are different only in
stall prevention operation level.
By returning [Pr. 292 = 0] (normal mode), the [Pr. 0,
13, 19, 22] setting becomes valid. [Pr. 61, 64] also
automatically return to the initial value (9999).
A700
(A700)
Initial Value Setting Range
55K or less
9999 75K or more 0 to 3600A
9999
0 to 10Hz
9999
9999
0
1
11
3
0
5
6
7, 8
[Pr. 292 = 5]
[Pr. 292 = 6]
Driving
current
100 120 140
(%)
115
Elevator mode
[Pr. 292 = 5] [Pr. 292 = 6]
Changes according to the
output current
[Pr. 64] 2Hz
Accelerate after maintaining
100ms
220V/440V
150% 180%
0 to 500A
Set the reference current for elevator mode.
Rated inverter current value reference
Set the starting frequency for the elevator mode.
Starting frequency 2Hz
Normal mode
Shortest acceleration/
deceleration (without brake)
Shortest acceleration/
deceleration (with brake)
Optimum acceleration/deceleration
Elevator mode 1
(stall prevention operation level 150%)
Elevator mode 2
(stall prevention operation level 180%)
Brake sequence mode 1, 2 (Refer to page 399.)
2) Restriction conditions
When the Advanced magnetic flux vector control,
Real sensorless vector control or vector control is
selected, elevator mode selection is invalid.
3) Applications
Appropriate application
• Elevator with counterweight
Inappropriate application
• Maximum torque may be insufficient for an
elevator subjected to the load of higher than
the rating.
For an elevator without counterweight, setting
2 or 3 in [Pr. 14 Load pattern selection] and
setting a proper value in [Pr. 19 Base frequency
voltage] makes the maximum torque larger
and is more advantageous than the selection
of the elevator mode.
4) Setting of dedicated parameters
By setting
application range can be made wider.
In the factory setting, the stall prevention function
is activated at the 150% (180%) value of the rated
inverter current.
Since the [Pr. 61, 64] settings automatically return
to the initial value (9999) if the [Pr. 292] setting is
changed, set [Pr. 292] first when you need to set
[Pr. 61, 64].
[Pr. 61]: Set
referenced for stall prevention operation
level (%). When the motor and inverter
are different in capacity, for example, and
it is desired to define the motor rating as
reference, set the reference current value
in this parameter.
[Pr. 64]: Used to set the starting frequency (Hz) in
the elevator mode. Set this parameter
when it is desired to increase/decrease
the starting torque.
249
PARAMETER
Description
(Refer to page 241)
the dedicated parameters,
the current value (A)
2
the
that is