Lenze 8200 vector User Manual

Behaviour in the event of mains switching, mains failure or controller inhibit
Controlled deceleration after mains failure/mains disconnection
10
Function library
10.5
10.5.3
L
10.5-4
EDS82EV903-1.0-11/2002
10.5.3 Controlled deceleration after mains failure/mains disconnection
)
))
) Note!
l The function can be used for a rated controller power of
maximally 1.5 kW.
l The deceleration time until standstill cannot be defined. It
depends on the machine/system components (moment of
inertia, friction,...). .
Controlled motor deceleration to standstill (f = 0) in the event of a mains
disconnection or mains failure.
The function can be used with or without external brake resistor:
This function prevents the motor from coasting at emergency off (controller is
disconnected from the mains).
Without external brake resistor
l Controlled motor deceleration to standstill (f = 0) when controller is active.
l The brake energy comes from system losses (controller and motor).
With external brake resistor
l Automatic and quick motor deceleration to standstill (f = 0).
l The deceleration time is shorter than without an external brake resistor.
1. The mains voltage is interrupted.
2. The DC-bus voltage (U
DC
) falls below the value under C0988 Þ the
controller switches to parameter set 1.
3. The drive decelerates along the quick-stop ramp (C0105 in parameter
set 1).
4. By operating in generator mode, U
DC
will be greater than the value under
C0988 Þ the controller switches to parameter set 2.
5. The motor accelerates along the acceleration ramp (C0012 in parameter
set 1).
6. When the DC-bus voltage falls below the value under C0988 the ”loop”
restarts at 2.
The ”loop” 2. to 6. is repeated until the motor speed is approx. 0, since the
rotational energy in the motor keeps up V
DC
.
If the motor is not at standstill when the mains is reconnected, the drive will
accelerate to the selected setpoint (C0012) along the acceleration ramp. The
drive starts immediately. The transition to the restart is ”harder” than in the
flying-restart circuit.
Description
Without brake resistor
With brake resistor
Function procedure
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Lenze 8200 vector Specifications

General

Brand	Lenze
Model	8200 vector
Category	DC Drives
Language	English