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

Product Features
Depending on the application and the purpose of using it,
this feature can be used as a preventive or reactive
measure and can be triggered/started in the following
ways:
•
On each start command (parameter 29-11 Derag
at Start/Stop).
•
On each stop command (parameter 29-11 Derag
at Start/Stop).
•
On each start/stop command
(parameter 29-11 Derag at Start/Stop).
5 5 •
On digital input (parameter group 5-1* Digital
Inputs).
•
On drive action with the smart logic controller
(parameter 13-52 SL Controller Action).
•
As timed action (parameter group 23-** Time-
based Functions).
•
On high power (parameter group 29-2* Derag
Power Tuning).

5.7 Pre/post Lube Overview

Certain motors require lubrication of their mechanical parts
before and during running to prevent damage/wear. This
situation is especially the case when the motor has not
been running for extended periods of time. Pre-lube also
supports applications that 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
time, beginning at the rising edge of a run command (for
example, start request). Furthermore, a start delay
(parameter 1-71 Start Delay) can be entered such that the
pre-lube occurs only while the drive is stopped and the
pre-lube completes just before the drive starts to ramp up.
Pre-lube can also be configured such that the external
device remains signaled always when the drive is in a
running state, or such that the signal stays on after the
motor has stopped (parameter 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 time and stop lubrication when the delay
expires and the drive starts.
Illustration 5.13 shows a different usage of the feature. In
this case, the delay expires while the drive is already
ramping up. See the related parameters in Table 5.1.
24
VLT® AQUA Drive FC 202
1
2
3
1
2
3
t
1
t
2
t
3
Illustration 5.13 Pre/post Lube Function Example
Parameter and
Name
Parameter 29-4
0 Pre/Post Lube
Function
Parameter 29-4
1 Pre Lube Time
Parameter 29-4
2 Post Lube
Time
Table 5.1 Pre/Post Lube Parameters
Danfoss A/S © 05/2017 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 (parameter 1-71 Start Delay)
and the pre-lube timer (parameter 29-41 Pre Lube Time).
The start delay timer expires. The drive starts to ramp up.
The pre-lube timer (parameter 29-41 Pre Lube Time)
expires.
Description Settings
Select the pre/post [0]*Disabled
lube function. Use [1] Pre lube only
parameter 1-71 Start [2] Pre & running
Delay to set the [3] Pre & running
delay before the & post
motor starts ramping.
Enter the duration of 0–600 (*10)
the signal after the
start signal. Used
only when [1] Pre
lube Only is selected
in
parameter 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
parameter 29-40 Pre/
Post Lube Function.
T
T
T
t3
Unit
–
s
s
MG22B102