Danfoss VLT AQUA Drive FC 202 Design Guide

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 (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)
•
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 specic action for a user-dened 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 adjustable frequency drive is
stopped and the pre-lube completes just before the
adjustable frequency drive starts to ramp up. Pre-lube can
also be congured such that the external device remains
signaled at all times when the adjustable frequency drive
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 adjustable frequency drive starts.
Figure 4.2 shows a dierent usage of the feature. In this
case, the delay expires while the adjustable frequency
drive is already ramping up. See the related parameters in
Table 4.1.
130BD765.10
N
MAX
N
MIN
0
1
1
0
0
1
2
3
t1 t3t2
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 (1-71 Start Delay) and the
pre lube timer (29-41 Pre Lube Time).
t
2
The start delay timer expires. The adjustable frequency
drive starts to ramp up.
t
3
The pre-lube timer (29-41 Pre Lube Time) expires.
Figure 4.2 Pre/post Lube Function Example
Parameter and
Name
Description Settings Unit
29-40 Pre/Post
Lube Function
Select the pre/post
lube function. Use
1-71 Start Delay to
set the delay before
the motor will start
ramping.
[0]*Disabled
[1] Pre-lube only
[2] Pre & running
[3] Pre & running
& post
-
29-41 Pre Lube
Time
Enter the duration of
the signal after the
start signal. Used
only when [1] Pre
lube Only is selected
in 29-40 Pre/Post Lube
Function.
0-600 (*10) s
29-42 Post Lube
Time
Select the duration of
the signal after the
motor has stopped.
Used only when [3]
Pre & running & post
is selected in
29-40 Pre/Post Lube
Function.
0-600 (*10) s
Table 4.1 Pre/Post Lube Parameters
Application Examples
VLT
®
AQUA Drive FC 202
102 Danfoss A/S © 09/2014 All rights reserved. MG20N622
44

Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English