Danfoss VLT AQUA Drive FC 202, Programming Manual

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3.25.4 29-4* Pre/Post-Lube Function
Use the pre/post-lube function in the following
applications:
•
A motor requires lubrication of its mechanical
parts before and while it runs to prevent damage
and wear. This is especially the case when the
motor has not been running for a long time.
•
An application requires external fans to run.
The function makes the frequency converter signal an
external device for a user-defined period. A start delay can
be configured with
parameter 1-71 Start Delay . With this
delay, the pre-lube function runs while the motor is
stopped.
For information about the pre/post lube function options,
see the following parameters:
•
Parameter 29-40 Pre/Post Lube Function .
•
Parameter 29-41 Pre Lube Time .
•
Parameter 29-42 Post Lube Time .
Consider the following use case:
•
A lubricating device starts the lubrication at the
time when the frequency converter receives the
start command.
•
The frequency converter starts the motor. The
lubrication device is still running.
•
After a certain time, the frequency converter
stops the lubrication device.
See Illustration 3.114 .
130BD765.10
N
MAX
N
MIN
0
1
1
0
0
1
2
3
t1 t3 t2
T
T
T
1 Speed curve
2 Start command (for example terminal 18)
3 Pre-lube output signal
t
1
Start command issued (for example terminal 18 is set
active). The start delay timer (
parameter 1-71 Start Delay )
and the pre-lube timer ( parameter 29-41 Pre Lube Time ).
t
2
The start delay timer expires. The frequency converter
starts to ramp up.
t
3
The pre-lube timer ( parameter 29-41 Pre Lube Time )
expires.
Illustration 3.114 Pre/Post Lube Function Example
29-40 Pre/Post Lube Function
Select when the pre/post-lube function is active. Use
parameter 1-71 Start Delay to set the delay before the frequency
converter starts to ramp up.
Option: Function:
[0]
*
Disabled
[1] Pre Lube Only
[2] Pre & Running
[3] Pre & Running & Post
29-41 Pre Lube Time
Range: Function:
10 s
*
[0 - 600
s] Enter how long the pre-lube function is
active. Use only when option
[1] Pre Lube Only
is selected in parameter 29-40 Pre/Post Lube
Function .
29-42 Post Lube Time
Range: Function:
10 s
*
[0 - 600
s] Enter how long the post-lube function is on
after the motor stops. Use only when option
[3] Pre & Running & Post is selected in
parameter 29-40 Pre/Post Lube Function .
Parameter Description Programming Guide
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