•
•
e
3
0
b
u
0
5
8
D
A
B
C
C
B
Illustration 71: The Prohibited Frequencies
A
Actual Reference
B
High Limit
C
Low Limit
D
Requested Reference
10.251 (ID 515) Frequency to Start DC Braking at Ramp Stop
Location in the menu:
P2.4.10
(Standard Application, Local/Remote Control Application, Multi-step Speed Control Application, PID
Control Application, Multi-purpose Control Application, Pump and Fan Control Application)
Use this parameter to set the output frequency at which the DC-braking starts.
See
10.252 (ID 516) Start Magnetizing Time
Location in the menu:
P2.4.11
(Standard Application, Local/Remote Control Application, Multi-step Speed Control Application, PID
Control Application, Multi-purpose Control Application, Pump and Fan Control Application)
Use this parameter to set the time during which the DC current is fed to the motor before the acceleration starts.
DC brake current is used at start to premagnetize the motor before running. It improves the torque performance at start. Varying
between 100 ms to 3 s, the time needed depends on motor size. A bigger motor requires a longer time. See parameter
ID 507
.
When Flying Start (see parameter
ID 505
) is used as start function, DC-braking at start is disabled.
10.253 (ID 518) Acceleration/Deceleration Ramp Speed Scaling Ration between Prohibit Frequency
Limits
Location in the menu:
P2.5.3
(Standard Application)
P2.5.7
(Local/Remote Control Application, Multi-step Speed Control Application, PID Control Application, Multi-purpose Control
Application, Pump and Fan Control Application)
Use this parameter to set the multiplier of the selected ramp times when the output frequency of the drive is between the prohibi-
ted frequency limits.
Defines the acceleration/deceleration time when the output frequency is between the selected prohibit frequency range limits (pa-
rameters
ID 509
to
ID 514
). The ramping speed (selected acceleration/ deceleration time 1 or 2) is multiplied by this factor. For exam-
ple, value 0.1 makes the acceleration time 10 times shorter than outside the prohibit frequency range limits.
AB296635287482en-000301 / DPD00903
236 | Danfoss A/S © 2023.02
Parameter Descriptions
VACON® NX All-in-One
Application Guide
Summary of Contents for VACON NX
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