NORD Drivesystems BU0180 - Manual (Page 84)

SK 180E Manual for frequency inverters
84 Pre-series version BU 0180 GB-0914
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
P108
Disconnection mode
(Disconnection mode)
S P
0 ... 13
{ 1 }
This parameter determines the manner in which the output frequency is reduced after "Blocking"
(controller enable  low).
0 = Voltage block: 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: The current output frequency is reduced in proportion to the remaining
deceleration time, from P103/P105.
2 = Ramp with delay: 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 = Immediate DC braking: The FI switches immediately to the preselected DC current
(P109). This DC current is supplied for the remaining proportion of the >DC brake time<
(P110). Depending on the relationship, actual output frequency to max. frequency
(P105), the >DC braking time< is shortened. The time taken for the motor to stop
depends on the application. This deceleration time depends of the moment of inertial of
the load and the DC current which is set (P109).
With this type of braking, no energy is fed back to the FI. Heat losses occur, mainly in the
rotor of the motor.
4 = Const. brake distance, „Constant brake distance“: The brake ramp is delayed in starting
if the equipment is not being driven at the maximum output frequency (P105). This
results in an approximately similar braking 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 = Combined braking, „Combined braking“: Dependent on the actual link voltage, 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). 
additional motor warming!
6 = Quadratic ramp: The brake ramp does not follow a linear path, but rather a decreasing
quadratic one.
7 = Quad. ramp with delay, "Quadratic ramp with delay": Combination of functions 2 and 6
8 = Quad. combined braking "Quadratic combined braking": Combination of functions 5 and 6
9 = Const.acc.pwr., „Constant acceleration power“: Only applies in field weakening range!
The drive is accelerated or braked using constant electrical power.
10 = Distance calculator: Constant distance between actual frequency / speed and the set
minimum output frequency (P104).
11 = Con. acc. pwr. w. delay, "Constant acceleration power with delay": Combination of
functions 2 and 9.
12 = Const. Accln. Power Mode3: as 11 with additional brake chopper relief
13 = 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).