Nord Drivesystems SK 200E Series, Manual

Page: 147 / 265

6 Parameterisation
BU 0200 GB Subject to technical alterations 147
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
P108 Disconnection mode
S P
0 ... 13
{ 1 }
This parameter determines the manner in which the output frequency is reduced after "Blocking"
(controller enable
Æ
Low).
0 = Voltage disable: The output signal is switched off immediately. The FI no longer supplies
an output frequency. In this case, the motor is braked only by mechanical friction.
Immediately switching the FI on again can lead to an error message.
1 = Ramp down: The current output frequency is reduced in proportion to the remaining
deceleration time, from P103/P105.
2 = Delayed ramping: as with ramp, however for generational operation the brake ramp is
extended, or for static operation the output frequency is increased. Under certain
conditions, this function can prevent overload switch off or reduce brake resistance
power dissipation.
NOTE: This function must not be programmed if defined deceleration is required, e.g.
with lifting mechanisms.
3 = Instant DC braking: The FI switches to the preselected DC current (P109) immediately.
This DC current is supplied for the remaining proportion of the >DC brake time< (P110).
Depending on the relationship of the actual output frequency to the max. frequency
(P105), the >DC braking time< is shortened. The time taken for the motor to stop
depends on the application. This depends on the inertia of the load, the friction and the
DC current which is set (P109).
With this type of braking, no energy is fed back to the FI. Heat losses occur primarily in
the rotor of the motor.
4 = Const ant brake distance: The brake ramp starts after a delay if the equipment is not
being driven at the maximum output frequency (P105). This results in an approximately
similar stopping distance for different frequencies.
NOTE: This function cannot be used as a positioning function. This function should not
be combined with ramp smoothing (P106).
5 = Combi ned braking: Dependent on the actual link voltage (VDC), a high frequency
voltage is switched to the basic frequency (linear characteristic curves only, P211 = 0
and P212 = 0). The deceleration time is retained where possible (P103).
Æ
additional
motor warming!
6 = Quadratic ramp: The brake ramp does not follow a linear path, but rather a decreasing
quadratic one.
7 = Quad ratic ramp with delay: Combination of functions 2 and 6
8 = Quad ratic ramp w ith combined braking: Combination of functions 5 and 6
9 = Constant acc eleratio n power : Only applies in field weakening range! The drive is further
accelerated or braked with a constant electrical power. The ramp depends on the load.
10 = Distance calculator: Constant distance between actual frequency / speed and the set
minimum output frequency (P104).
11 = Constant acc eleratio n power with delay: Combination of functions 2 and 9.
12 = Constant acc eleratio n power Mode3: as 11 with additional brake chopper relief
13 = Switch-off delay