Danfoss VLT 8000 AQUA series Operating Instructions Manual page 103

Description of choice:
Adjust the damping percentage until the motor
resonance has disappeared.
110 High break-away torque
(HIGH START TORQ.)
Value:
0.0 - 0.5 sec.
Function:
In order to secure a high starting torque, the
maximum torque for max. 0.5 sec. is allowed.
However, the current is limited by the protection
limit of the frequency converter.
0 sec. corresponds to no high break-away torque.
Description of choice:
Set the necessary time in which a high starting
torque is desired.
111 Start delay
(START DELAY)
Value:
0.0 - 120.0 sec.
Function:
This parameter enables a delay of the starting time
after the conditions for start have been fulfilled.
When the time has passed, the output frequency
will start by ramping up to the reference.
Description of choice:
Set the desired time until acceleration is to begin.
112 Motor preheater
(MOTOR PREHEAT)
Value:
Disable (DISABLE)
Enable (ENABLE)
Function:
The motor preheater ensures that no condensate
develops in the motor at stop. This function can also
be used to evaporate condensed water in the motor.
The motor preheater is only active during stop.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
Description of choice:
Select Disable [0] if this function is not required. Select
Enable [1] to activate motor preheating. The DC current
is set in parameter 113 Motor preheater DC current.
113 Motor preheater DC current
(PREHEAT DC-CURR.)
Value:
0.0 sec.
0 - 100 %
The maximum value depends on the rated motor
current, parameter 105 Motor current, I
Function:
The motor can be preheated at stop by means of a DC
current to prevent moisture from entering the motor.
VLT 8152-8602, 380-460 V and VLT 8052-8652,
525-690 V work with a reduced DC current. The level
can, depending on motor selection, be down to 80%.
Description of choice:
The motor can be preheated by means of a DC
current. At 0%, the function is inactive; at a value
higher than 0%, a DC current will be supplied to
the motor at stop (0 Hz). This function can also
be used to generate a holding torque.
0.0 sec.
If too high a DC current is supplied for too
long, the motor can be damaged.
DC braking
In DC braking, the motor receives a DC current
that brings the shaft to a halt. Parameter 114 DC
braking current, decides the DC braking current as
a percentage of the rated motor current I
In parameter 115 DC braking time, the DC braking
time is selected, and in parameter 116DC brake
cut-in frequency, the frequency is selected at
which DC braking becomes active.
[0]
If terminal 19 or 27 (parameter 303/304 Digital input) has
[1]
been programmed to DC braking inverse and shifts from
logic "1" to logic "0", the DC braking will be activated.
When the start signal on terminal 18 changes
from logic "1" to logic "0", the DC braking will be
activated when the output frequency becomes lower
than the brake coupling frequency.
NB!:
The DC brake is not to be used if the inertia
of the motor shaft is more than 20 times
the inertia of the motor itself.
®
VLT 8000 AQUA
M,N
M,N
50 %
.
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103