Eaton MMX12 Series - Page 93

04/10 MN04020001Z-EN
Parameter menu (PAR)
89
The values for the acceleration time t
1
and the deceleration
time t
2
are calculated as follows:
P6.3 101 - Minimum frequency 0.00
0.00 - P6.4 [Hz]
P6.4 102 - Maximum frequency 50.00
P6.3 - 320 Hz
P6.5 103 - Acceleration time (acc1) 3.0
0.1 – 3000 s (see figure 80 below)
P6.6 104 - Deceleration time (dec1) 3.0
0.1 – 3000 s (see figure 80 below)
Figure 80: Acceleration and deceleration time
Reference points for the acceleration and deceleration times set in parameters P6.5 and P6.6 are always 0 Hz (P6.3) and the maximum
output frequency is f
max
(P6.4).
a When setting a minimum output frequency (P6.3 greater than 0 Hz), the acceleration and deceleration time of the drive is reduced to
t
1
or t
2
.
PNU
ID Access right
RUN
Value Description Factory setting
(P1.3)
[Hz]
t [s]
a
f
out
P6.3
P6.4
P6.3
P6.5 P6.6
t
1
t
2
t
1
=
(P6.4 - P6.3) x P6.5
P6.4
t
2
=
(P6.4 - P6.3) x P6.6
P6.4
h
The defined acceleration (P6.5) and deceleration times
(P6.6) apply for all changes to the frequency setpoint
value.
If the start-release (FWD, REV) is switched off, the output
frequency (f
Out
) is immediately set to zero. The motor runs
down uncontrolled.
If a controlled run-down is requested (with value from
P6.6), parameter P6.8 must be 1.
Starting friction and load inertia can lead to longer
acceleration times for the drive than are set in P6.5.. Large
centrifugal masses or if driven by the load, the
deceleration time of the drive can be greater than is set in
P6.6.