Nord Drivesystems SK 300P Series - Page 64

NORDAC ON / ON+ (SK 3xxP) – Manual with installation instructions
64 BU 0800 en-4521
7
Quad. Ramp with Delay
"
Quadratic ramp with delay
": Combination of {2 } and {6}.
8
Quad. comb. braking
"Quadratic combined braking": Combination of {5 } and {6}.
Note: This function is not suitable for PMSM motors
9
Const. Accel. Power
"Constant acceleration power": Only applies in field weakening
range. The drive is accelerated or braked with constant electrical
power. The shape of the ramps depends on the load.
10
Distance calculator
Constant distance between actual frequency / speed and the set
minimum output frequency P104.
as for “Const. braking distance”. However, function [10] only
becomes active if the setpoint frequency undershoots the set
minimum frequency. In this case, enabling must be retained.
11
Const. Accel. Power with Delay
"Constant acceleration power with delay": Combination of {2 } and {9}.
12 Const. accel. power Mode 3
"Constant acceleration power mode 3" as for {11}, however with
additional relief of the brake chopper.
13 Switch-off delay
"Ramp with disconnection delay!” as for {1 }"Ramp", however,
before the brake is applied, the drive unit remains at the absolute
minimum frequency set in parameter P505 for the time specified in
parameter P110.
Application example: Re-positioning for crane control
P109 DC brake current S P
Setting range
0 … 250 %
Factory setting
{ 100 }
Description
Current setting for the functions of DC current braking (P108 = 3) and combined
braking (P108 = 5).
The correct setting value depends on the mechanical load and the required
deceleration time. A higher setting brings large loads to a standstill more quickly.
The 100 % setting corresponds to a current value as stored in the "Nominal motor
current" parameter P203.
Note
The DC current (0 Hz) which the FI can supply is limited. For this value, please refer
to the table in Section 8.2.3 "Reduced overcurrent due to output frequency", column:
0 Hz. In the basic setting this limiting value is 110 %.
DC Braking: Not for PMSM motors!
P110 Time DC-brake on S P
Setting range
0.00 … 60.00 s
Factory setting
{ 2.00 }
Description
The time for which the DC current selected in P109 is applied to the motor. For this,
function {3} “Instant d.c. Braking”” must be set in P108.
Depending on the relationship of the actual output frequency to the max. frequency
P105 , the "DC brake time" is shortened.
The time starts running with the removal of the enable and can be interrupted by
renewed enabling.
Note
DC Braking: Not for PMSM motors!
P111 P - torque limit factor S P
Setting range
25 … 400 %
Factory setting
{ 100 }
Description
"
P torque limit factor
". Directly affects the behaviour of the drive at the torque limit.
The basic setting of 100 % is sufficient for most drive tasks.
If the values are too high the drive tends to oscillate as it reaches the torque limit. If
values are too low, the programmed torque limit can be exceeded.