NORD Drivesystems BU0500 - Manual (Page 79)

5 Parameters
BU 0500 GB-1013 79
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
à Low).
0 = Voltage disable: The output signal is switched off immediately. The FI no longer
supplies an output frequency. The motor is only braked 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. The DC run-on follows the end of the ramp (if
programmed in P559).
2 = Delayed ramping: as for 1 "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
current set (P109).
With this type of braking, no energy is returned to the FI; heat loss occurs mainly in the
motor rotor.
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 = Combi. braking, "Combined braking": Dependent on the actual link voltage (UZW), a
high frequency voltage is switched to the basic frequency (only for linear characteristic
curves, P211 = 0 and P212 = 0). The deceleration time is retained where possible
(P103).
à 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. ramp w. braking, "Quadratic combined braking": Combination of functions 5 and 6.
9 = Constant accn., "Constant acceleration power": Only applies in field weakening range!
The drive is accelerated or 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 = Const. accn. delay, "Constant acceleration power with delay": Combination of functions
2 and 9.
12 = Const. accn. mode 3, "Constant acceleration power mode 3": as for 11, however with
additional chopper relief.
13 = Switch off delay, "Ramp with switch-off 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.
Pos : 112 /Anleit ungen/5. / 6. Parametrier ung [BU 0500 / BU 0200]/ Par ameter/ P100-P199Par ameter P109 – Strom DC-Bremse @ 0\ mod_1327585946142_388. doc x @ 7700 @ @ 1