Danfoss VLT DriveMotor FCM 106, Design Manual

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Energy savings
P
shaft
=P
shaft output
Illustration 4.9 Flow Distribution over 1 Year
175HA209.11
60
50
40
30
20
10
H
s
0 100 200 300 400
(mwg)
B
C
A
750rpm
1050rpm
1350rpm
1650rpm
0
10
20
30
(kW)
40
50
60
200 100 300 ( m 3 /h )
(
m
3
/h
)
400
750rpm
1050rpm
1350rpm
1650rpm
P
shaft
C 1
B 1
A 1
Illustration 4.10 Pump Performance
m
3
/
h
Distri-
bution
Valve regulation Frequency converter
control
% Hours Power Consump-
tion
Power Consump-
tion
A
1
- B
1
kWh A
1
- C
1
kWh
350 5 438 42.5 18.615 42.5 18.615
300 15 1314 38.5 50.589 29.0 38.106
250 20 1752 35.0 61.320 18.5 32.412
200 20 1752 31.5 55.188 11.5 20.148
150 20 1752 28.0 49.056 6.5 11.388
100 20 1752 23.0 40.296 3.5 6.132
Σ
100 8760 275.064 26.801
Table 4.5 Pump Performance
4.3 Control Examples
4.3.1 Better Control
When a frequency converter is used for controlling the
flow or pressure of a system, improved control is obtained.
A frequency converter can vary the speed of the fan or
pump, obtaining variable control of flow and pressure.
Furthermore, a frequency converter can quickly adapt the
speed of the fan or pump to new flow or pressure
conditions in the system.
Achieve simple control of process (Flow, Level or Pressure)
using the built-in PI control.
4.3.2 Smart Logic Control
A useful facility in the frequency converter is the smart
logic control (SLC).
In applications where a PLC is generates a simple
sequence, the SLC can take over elementary tasks from the
main control.
SLC is designed to act from events sent to or generated in
the frequency converter. The frequency converter then
performs the pre-programmed action.
4.3.3 Smart Logic Control Programming
The smart logic control (SLC) comprises a sequence of
user-defined actions (see
13-52 SL Controller Action )
executed by the SLC when the associated user-defined
event (see 13-51 SL Controller Event ) is evaluated as TRUE
by the SLC.
Events and actions are each numbered and are linked in
pairs called states. This means that when event [1] is
fulfilled (attains the value TRUE), action [1] is executed.
After this, the conditions of event [2] is evaluated, and if
evaluated TRUE, action [2] is executed and so on. Events
and actions are placed in array parameters.
Only one event is evaluated at any time. If an event is
evaluated as FALSE, nothing happens (in the SLC) during
the present scan interval and no other
events are
evaluated. This means that when the SLC starts, it
evaluates
event [1] (and only event [1] ) each scan interval.
Only when event [1] is evaluated TRUE, the SLC executes
action [1] and starts evaluating event [2] .
It is possible to program from 0 to 20 events and actions .
When the last event/action has been executed, the
sequence starts over again from event [1]/action [1] .
Illustration 4.11 shows an example with 3 events/actions :
Application Examples
VLT
®
DriveMotor FCP 106 and FCM 106 Design Guide
40 MG03M102 - 08/2015
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