22
MENU 2: RAMPS
LEROY-SOMER
2.3 - Explanation of parameters in
menu 2
2.01
:Post-ramp reference
Adjustment range : • If
1
1
.
.
1
1
0
0
= 0 and
2
2
.
.
0
0
2
2
= 0: 0 to
1
1
.
.
0
0
6
6
• If
1
1
.
.
1
1
0
0
= 0 and
2
2
.
.
0
0
2
2
= 1:
1
1
.
.
0
0
7
7
to
1
1
.
.
0
0
6
6
• If
1
1
.
.
1
1
0
0
= 1: ±
1
1
.
.
0
0
6
6
Measurement of the post-ramp reference. Used for
diagnostics.
2.02
:Ramp by-pass (
)
Adjustment range : 0 or 1
Factory setting
: 0
0 (raMP): Active ramps.
1 (no):
Ramps short-circuited.
2.03
:Ramp hold
Adjustment range : 0 or 1
Factory setting
: 0
0 (raMP): Ramp freed.
1 (StoP):
The ramp is held and acceleration (or deceleration)
is therefore interrupted.
CAUTION:
The ramp hold function is disabled if a stop command is
given.
2.04
:Ramp mode select
Adjustment range : 0 to 3
Factory setting
: 1
0 (Fst):
Deceleration ramp imposed. If the deceleration ramp
which has been set is too fast in relation to the inertia of the
load, the DC bus voltage exceeds its maximum value (set in
2
2
.
.
0
0
8
8
) and the drive passes into overvoltage trip state "OU".
CAUTION:
Select mode 2
2
.
.
0
0
4
4
= 0 (Fst) when a braking resistor is
being used.
1 (Std): Standard deceleration ramp with automatic
extension of the ramp time in order to avoid causing a DC
bus overvoltage fault on the drive (threshold set in 2
2
.
.
0
0
8
8
).
2 (StdH):
The drive allows the motor voltage to be increased
up to 1.2 times the rated voltage set in
5
5
.
.
0
0
9
9
(motor rated
voltage), to avoid reaching the maximum DC bus voltage
threshold (threshold set in
2
2
.
.
0
0
8
8
). However, if this is not
adequate, the standard deceleration ramp time is extended,
to avoid causing a DC bus overvoltage trip on the drive.
For the same quantity of energy, mode 2 enables faster
deceleration than mode 1.
3 (FstH):
Same as mode 2, but the ramp is imposed. If the
configured ramp is too fast, the drive passes into OU trip
state.
CAUTION:
In mode 2 and 3, the motor must be able to tolerate
additional losses relating to the increase in voltage at its
terminals.
2.05
:Not used
2.06
:S ramp enable
Adjustment range : 0 or 1
Factory setting
: 0
0 (Lin): The ramp is linear.
1 (S-rP):
A curved part (defined in
2
2
.
.
0
0
7
7
) at the start and end
of the ramp avoids load swinging.
CAUTION:
The S ramp is deactivated during controlled
decelerations (2
2
.
.
0
0
4
4
= 1 or 2).
2.07
:S ramp acceleration limit
Adjustment range : 2 to 10
Factory setting
: 10
Used to modify the ramp curve by the same value at the start
and end of the ramp.
The value 4 represents a time for the curved part of 25% of
the total ramp and 10 represents a time for the curved part
of 10%.
2.08
:Standard ramp voltage
Adjustment range : 0 to 800V
Factory setting
: Eur: 690V, USA: 750V
This threshold is used when the drive is configured in
standard deceleration mode (
2
2
.
.
0
0
4
4
= 1 or 2).
If this threshold is too low, the machine will stop in freewheel
mode. If this threshold is too high and there are no resistors
connected, the drive will trip due to DC bus overvoltage
("OU" trip).
The minimum value of this parameter must be 50V higher
than the DC bus voltage obtained with the maximum supply
voltage. (U bus = U supply x
√
2).
2.09
:Not used
2.10
:Acceleration rate selector
Adjustment range : 0 to 9
Factory setting
: 1
This parameter is used to select the acceleration ramp as
follows:
0 (Sel):
Selection of the acceleration ramp via digital input.
The choice of ramp comes from the binary/decimal converter
in menu 9 (
9
9
.
.
3
3
2
2
).
1 (Acc1): Acceleration ramp 1
2 (Acc2):
Acceleration ramp 2
3 (Acc3):
Acceleration ramp 3
4 (Acc4):
Acceleration ramp 4
5 (Acc5):
Acceleration ramp 5
6 (Acc6):
Acceleration ramp 6
7 (Acc7):
Acceleration ramp 7
8 (Acc8):
Acceleration ramp 8
9 (rP.Pr):
The ramp is automatically associated with the
corresponding preset speed.
2
2
.
.
0
0
1
1
2
2
.
.
0
0
2
2
2
2
.
.
0
0
3
3
2
2
.
.
0
0
4
4
2
2
.
.
0
0
5
5
2
2
.
.
0
0
6
6
2
2
.
.
0
0
7
7
2
2
.
.
0
0
8
8
2
2
.
.
0
0
9
9
2
2
.
.
1
1
0
0
