NORD Drivesystems BU0700 User Manual
Page 67
BU 0700 GB-1411
Subject to technical alterations
67
Parameter
Setting value / Description / Note
Available in Option
P108 (P)
Disconnection mode
always visible
0 ... 12
[ 1 ]
This parameter determines the manner in which the output frequency is reduced after "Blocking"
(controller enable 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. Immediate
switching on again of the FI can lead to error switch off.
1 = Ramp down: The actual output frequency is reduced proportionally to the remaining braking time
from P103.
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 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 >Time DC brake on< is
shortened.
The time taken for the motor to stop depends on the application. The time taken to stop depends
on the mass inertia of the load and the DC set (P109).
With this type of braking, no energy is returned to the FI; heat loss occurs mainly in the motor
rotor.
4 = Constant brake distance: The brake ramp is delayed in starting if the equipment is not being
driven at the maximum output frequency (P105). This leads to a similar braking distance from
various frequencies.
Note: This function cannot be used as a positioning function. This function should not be used with
a ramp rounding (P106).
5 = Combined braking: Dependent on the actual link voltage (CLV), a high frequency voltage is
switched to the basic mode (linear characteristic curves only, P211 = 0 and P212 = 0). The
deceleration time is retained where possible (P103). additional motor warming!
6 = Quadratic ramp: The braking ramp does not have a linear course, but is square.
7 = Quadratic ramp with delay: Combination of functions 2 and 6
8 = Quadratic combined braking: Combination of functions 5 and 6
9 = Constant acceleration power: Only applies in field weakening range! The drive is accelerated
and braked using constant electrical power. The course of the ramps depends on the load.
10 = Distance calculator: Constant distance between actual frequency / speed and the set minimum
output frequency (P104).
11 = Constant acceleration power with delay: Combination of functions 2 and 9.
12 = Constant acceleration power with delay (as 11) with additional chopper relief
P109 (P)
DC brake current
always visible
0 ... 250 %
[ 100 ]
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.
A setting of 100% corresponds to a current value as set in parameter P203.
P110 (P)
Time DC-brake on
always visible
0.00 ... 60.00 s
[ 2.0 ]
The time during which the motor has the current selected in parameter >DC brake current< applied to it
during the DC braking functions (P108 = 3).
Depending on the relationship, actual output frequency to max. frequency (P105), the >Time DC brake
on< is shortened.
The time starts running with the removal of the enable and can be interrupted by fresh enabling.
P111 (P)
P -factor torque limit
always visible
25 ... 400 %
[ 100 ]
Directly affects the behaviour of the drive at torque limit. The basic setting of 100 % is sufficient for
most drive tasks.
If values are too high the drive tends to vibrate as it reaches the torque limit.
If values are too low, the programmed torque limit can be exceeded.