Pre/Post Lube - Danfoss VLT AQUA Drive FC 202 Design Manual

Application Examples
•
On each start command (29-11 Derag at Start/
Stop)
•
On each stop command (29-11 Derag at Start/
Stop)
•
On each start/stop command (29-11 Derag at
Start/Stop)
•
On digital input (parameter group 5-1* Digital
Inputs)
4 4
•
On drive action with the smart logic controller
(13-52 SL Controller Action)
•
As timed action (parameter group 23-** Time-
based Functions)
•
On high power (parameter group 29-2* Derag
Power Tuning)

4.2.4 Pre/post Lube

Certain motors require lubrication of their mechanical parts
before and during running to prevent damage/wear. This
is especially the case when the motor has not been
running for extended periods of time. Pre-lube also
supports applications that may require certain exhaust fans
to be running. The Pre-lube feature signals an external
device to start performing a specific action for a user-
defined period of time beginning at the rising edge of a
run command (for example, start request). Furthermore, a
start delay (1-71 Start Delay) can be entered such that the
pre-lube only occurs while the frequency converter is
stopped and the pre-lube completes just before the
frequency converter starts to ramp up. Pre-lube can also
be configured such that the external device remains
signalled at all times when the frequency converter is in a
running state or such that the signal stays on after the
motor has stopped (29-42 Post Lube Time). Application
examples include a device to lubricate the mechanical
parts of a motor/pump or some type of exhaust fan unit.
An example use case for a lubrication device would be to
start lubrication at the rising edge of a start request. Delay
the start for a period of time and stop lubrication when
the delay expires and the frequency converter starts.
Illustration 4.2 shows a different usage of the feature. In
this case, the delay expires while the frequency converter
is already ramping up. See the related parameters in
Table 4.1.
98
Design Guide
1
2
3
1
2
3
t
1
t
2
t
3
Illustration 4.2 Pre/post Lube Function Example
Parameter and
Name
29-40 Pre/Post
Lube Function
29-41 Pre Lube
Time
29-42 Post Lube
Time
Table 4.1 Pre/Post Lube Parameters
Danfoss A/S © 09/2014 All rights reserved.
N
MAX
N
MIN
0
1
0
1
0
t1 t2
Speed curve
Start command (for example, terminal 18)
Pre lube output signal
Start command issued (for example, terminal 18 is set
active). The start delay timer (1-71 Start Delay) and the
pre lube timer (29-41 Pre Lube Time).
The start delay timer expires. The frequency converter
starts to ramp up.
The pre lube timer (29-41 Pre Lube Time) expires.
Description Settings
Select the pre/post [0]*Disabled
lube function. Use [1] Pre lube only
1-71 Start Delay to [2] Pre & running
set the delay before [3] Pre & running
the motor will start & post
ramping.
Enter the duration of 0-600 (*10)
the signal after the
start signal. Used
only when [1] Pre
lube Only is selected
in 29-40 Pre/Post Lube
Function.
Select the duration of 0-600 (*10)
the signal after the
motor has stopped.
Used only when [3]
Pre & running & post
is selected in
29-40 Pre/Post Lube
Function.
T
T
T
t3
Unit
-
s
s
MG20N602