285
2
P
ARAM
ETE
R
PARAMETER
Torque limit by analog input can be calibrated using
calibration parameter [
C16 to C19 (Pr. 919, Pr. 920)
],
[
C38 to C41 (Pr. 932, Pr. 933)
], [
C34 to C37 (Pr. 928,
929)
]. (Refer to page 320)
(5) Second torque limit level (TL signal) [
Pr. 815
]
For [
Pr. 815 Torque limit level 2
], the [
Pr. 815
] value is a
torque limit value regardless of [
Pr. 810 Torque limit
input method selection
] when the torque limit selection
signal (TL) is ON.
Set [
Pr. 178 to 189 Input terminal function selection
] to
assign a function to the TL signal.
(6) Torque limit value during acceleration/
deceleration [
Pr. 816, 817
]
You can set torque limit during acceleration and
deceleration individually.
Torque limit by [
Pr. 816 Torque limit level during
acceleration
] and [
Pr. 817 Torque limit level during
deceleration
] is shown below.
(7) Setting increments switchover of the
torque limit level [
Pr. 811
]
By setting [
Pr. 811 Set resolution switchover = 10, 11
]
under vector control, the setting increments of [
Pr. 22
Torque limit level
] and [
Pr. 812 to Pr. 817 Torque limit
level
] can be switched to 0.01%.
Note that the internal resolution of the torque limit is
0.024% (100/2
12
) and the fraction less than the
resolution is rounded off.
The fraction less than the resolution equivalent to
0.1% is rounded off even if [
Pr. 811 = 10, 11
] when
Real sensorless vector control is selected.
When the torque restriction setting increments have
been changed (0.1% 0.01%), reset is necessary
because the settings of [
Pr. 22, Pr. 812 to Pr. 817
] are
multiplied by 1/10 (ten times). For example, when [
Pr.
22 = 150.00%
] and [
Pr. 811 = 10 (0.01%) 1 (0.1%)
],
[
Pr. 22 = 1500.0%
] and the maximum torque is 400%.
(Refer to page 343 for switchover of speed setting
increments.)
(8) Torque characteristic in the constant
power range [
Pr. 803
].
You can select whether the torque limit in the
constant power range be constant torque limit
(setting is "1") or constant power limit (initial setting is
"0") using [
Pr. 803 Constant power range torque
characteristic selection
] under torque limit operation.
(9) Fault stop when torque limit is activated
[
Pr. 865, 874
]
This function makes an inverter trip if the torque limit
is activated to stall the motor.
The motor stalls if the torque limit is activated under a
high load applied during speed control or position
control. At this time, if the motor speed is lower than
the speed set in [
Pr. 865 Low speed detection
] and also
the output torque exceeds the level set in [
Pr. 874 OLT
level setting
] for 3s, it is regarded as a stop effected by
stall prevention and E. OLT is output, resulting in a
fault.
quad1
quad4
quad2
Reverse rotation
Forward rotation
Torque limit
Rated speed
+
-
Terminal 1 input or
internal torque limit
([
Pr.22
] etc.) whichever
is smaller
Speed
quad3
Reverse
regeneration
Reverse
driving
Forward
driving
Forward
regeneration
Terminal 4 input or
internal torque limit
([
Pr.22
] etc.) whichever
is smaller
Terminal 4 input or
internal torque limit
([
Pr.22
] etc.) whichever
is smaller
Terminal 1 input or
internal torque limit
([
Pr.22
] etc.) whichever
is smaller
[
Pr.815
]
[
Pr.815
]
[
Pr.815
]
[
Pr.815
]
quad4
quad2
Reverse
rotation
Forward
rotation
Torque limit
Speed
Reverse
driving
Reverse
regeneration
Rated speed
quad3
+
-
Forward
regeneration
Forward
driving
quad1
Acceleration
Constant speed
Deceleration
Set
frequency
Output
frequency
(Hz)
Time
Torque limit level
1s
[
Pr. 816
]
Torque limit level during acceleration
[
Pr. 22
]
Torque limit level
[
Pr. 817
]
Torque limit level during deceleration
After the state where
difference between the
set speed and running
speed is within ±2Hz has
persisted for 1s, torque
limit level during
acceleration / deceleration
[
Pr. 816
]
or
[
Pr. 817
] shifts to
torque limit level during
constant speed [
Pr. 22
].
Speed
Base speed
Torque
[
Pr. 803
= 1]:
constant torque limit
[
Pr. 803
= 0]:
constant power limit
(torque reduction)
Constant power range
Constant torque range
Output torque
Output
frequency
Start
signal
(STF)
Fault
output
[
Pr.874
]
Torque limit
[
Pr.865
]
3s
Torque
Time
Time
E.OLT occurrence
Summary of Contents for FR-A700 Series
Page 245: ...279 2 PARAMETER PARAMETER MEMO ...
Page 440: ...474 PARAMETER MEMO ...
Page 522: ...556 SELECTION MEMO ...
