Minimum Intertia; Mechanical Brake Release Delay; Mechanical Brake Initial Torque; Mechanical Brake Initial Direction - Danfoss VLT 5000 FLUX Operating Instructions Manual

161 Minimum Intertia

(MINIMUM INERTIA)
Value:
2
[kgm ]
Function:
Set the minimum moment of Inertia of the
mechanical system.
Description of choice:
The frequency converter calculates the proportional
gain for the speed controller based on the mean
value of minimum and maximum inertia.
Converting factors:
To convert To
from
2 2
ft lbs s kgm
2 2
lbf in kgm
2 2
kgcm kgm
2 2
GD kgm
162 Maximum Inertia
(MAXIMUM INERTIA)
Value:
2
[kgm ]
Function:
Set the maximum moment of Inertia of the
mechanical system.
Description of choice:
See parameter 161.
163 Functional Stop Delay
(FUNC. STOP DELAY)
Value:
0-10 sec.
Function:
When stopping, this delay postpones the change
to the selected stop-function, unless DC-brake is
enabled. During this delay, the shaft will be held
at zero speed with full holding torque.
Description of choice:
Ensuring that the mechanical brake has locked the
load before the motor is in coast mode.
See Mechanical brake control.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.55.A6.02 - VLT is a registered Danfoss trademark
Depends on unit
Multiplication Factor
1.356
-4
2.926*10
-4
*10
0.25
Depends on the unit
0
®
VLT 5000 FLUX

164 Mechanical Brake Release Delay

(BRAKE REL. DELAY)
Value:
0.01-2.00 sec
Function:
When Mechanical Brake Release is selected as
start-function in Parameter 121, this delay describes
the time it takes for the brake to open. During this
delay, the motor will be held a 0 RPM.

165 Mechanical Brake Initial Torque

(BRAKE INI TORQUE)
Value:
+/- p221
Function:
When Mechanical Brake Release is selected as a
start-function in Parameter 121, this torque-level
will be built up against the closed brake prior to
brake release. When using the drive in a crane,
lift or hoist application with a mechanical brake,
this torque should be set to a value equal to the
torque present, when the brake opens.

166 Mechanical Brake Initial Direction

(BRAKE INIT DIR)
Value:
[Clockwise]
[Ref. dir.]
Function:
When Mechanical Brake Release is selected as
a start-function in Parameter 121, this Parameter
determines the direction of the initial torque applied
against the closed brake. In a crane application the
load will always be in the same direction, but in other
applications it may make sense to apply the torque
in the same direction as the reference.
167 Proportional Gain Boost, during
Mechanical Brake Release
(BRAKE GAIN BOOST)
Value:
0-400%
Function:
When Mechanical Brake Release is selected as
start-function in Parameter 121, this Parameter
0.50 sec
20%
[Clockwise]
100%
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