Moeller DF51 - Deceleration Ramp, Interrupting; Pulse Frequency (PNU B083)

10/05 AWB8230-1541GB
System settings
141
Deceleration ramp, interrupting
Excessively short deceleration ramps or high-inertia loads can
cause unsynchronized operation during deceleration. The motor
then works regeneratively and charges up the internal DC link.
Excessive voltage results in fault signal E 07.
With PNU b130 you can automatically stop the deceleration ramp
when the DC link voltage reaches an excessive value during
deceleration. The switching threshold is defined with PNU b131.
Pulse frequency (PNU b083)
The pulse frequency is the operating frequency of the inverter’s
transistors. It provides pulse-width modulated conversion of DC
link voltage in three-phase, sinusoidal AC voltage for the three-
phase motor.
A high pulse frequency results in low noise generation and loss in
the motor but higher losses in the inverter and a higher
interference level on the mains and motor supply cables (EMC). At
pulse frequencies above 12 kHz and an ambient temperature of
40
o
C the DF51 can be operated only at about 80 % rated current
I
e
.
You can set the pulse frequency in the range from 2 to 14 kHz.
PNU Name RUN b031
= 10
Value Function DS
b130 Internal DC
link, stop
deceleration
ramp on
overvoltage in
the internal DC
link
– j 00 OFF, disabled 00
01 ON, enabled: When activated, the deceleration ramp is interrupted until
the DC link voltage falls below the value set with PNU b131 again.
b131 Deceleration
ramp,
switching
threshold
dependent on
internal DC link
voltage
j j 330 – 395 V
(Ue = 230 V)
The default setting depends on the frequency inverter’s rated voltage
(U
e
).
380/
760
660 – 790 V
(Ue = 400 V)
h
All ratings of frequency inverter DF51 are based on the
default pulse frequency of 5 kHz.
PNU Name RUN b031
= 10
Value Function DS
b083 Carrier
frequency
– – 2 – 14 kHz Pulse frequency 5.0
b150 Pulse
frequency,
automatic
pulse
frequency
reduction on
overtemperatu
re
– j 00 OFF, disabled
DF51 continually works with the pulse frequency set with PNU b083
00
01 ON, enabled
On overtemperature the pulse frequency is automatically reduced to the
smallest permissible value (2 or 2.1 kHz).