0
10%
20%
30%
40%
50%
Time
60%
70%
80%
90%
100%
4
17
7
H
A
5
07
.1
0
S
p
ee
d
1
2
3
Illustration 5.4
1. Early acceleration
2. Constant acceleration
3. Late acceleration
4.
1-16 Start Ramp Time
Table 5.2 1-13 Adaptive Start Profile
NOTE
AAC Adaptive Acceleration Control will control the load
according to the programmed profile. Start current will
vary according to the selected acceleration profile and the
programmed start time.
If replacing a motor connected to an MCD 500
programmed for AAC Adaptive Control starting or
stopping, or if the starter has been tested on a different
motor prior to actual installation, the starter will need to
learn the characteristics of the new motor. The MCD 500
will automatically re-learn the motor's characteristics if
1-1
Motor Full Load Current
or
1-12 Adaptive Control Gain
is
changed.
5.3.4 Kickstart
Kickstart provides a short boost of extra torque at the
beginning of a start, and can be used in conjunction with
current ramp or constant current starting.
Kickstart can be useful to help start loads that require high
breakaway torque but then accelerate easily (for example
flywheel loads such as presses).
700%
600%
500%
300%
100%
400%
200%
10%
20% 30% 40% 50%
Rotor speed (% full speed)
60% 70% 80% 90%
100%
17
7
H
A
5
0
8
.1
0
Cu
rr
en
t (
%
m
o
tor
f
u
ll
loa
d
c
ur
re
nt
)
1
5
4
6
3
2
Illustration 5.5
1:
1-7 Kickstart Level
2:
1-8 Kickstart Time
3:
1-5 Initial Current
4:
1-6 Start Ramp Time
5:
1-4 Current Limit
6: Full voltage current
Table 5.3
5.4 Stopping Modes
5.4.1 Coast to Stop
Coast to stop lets the motor slow at its natural rate, with
no control from the soft starter. The time required to stop
will depend on the type of load.
5.4.2 TVR Soft Stop
Timed voltage ramp reduces the voltage to the motor
gradually over a defined time. The load may continue to
run after the stop ramp is complete.
Timed voltage ramp stopping can be useful for
applications where the stop time needs to be extended, or
to avoid transients on generator set supplies.
Application Examples
MCD 500 Operating Instruction
32
MG17K402 - VLT
®
is a registered Danfoss trademark
5
5