27-7* Connections
Example
27-70.0 Relay 1
[1] Drive 2 Enable
27-70.1 Relay 2
[2] Drive 3 Enable
Table 6.7 Master Drive Settings, 27-7* Connections
6.1.3 Follower Drive Settings
Follower drives must be configured for open loop
operation with basic settings as described in
6.1.1 Basic
Settings
.
Configure only one of the followers and to copy the
settings by using the LCP.
Open Loop Settings (Follower)
Example/Remarks
1-00 Configuration Mode
[0] Open Loop
3-02 Minimum Reference
0
3-03 Maximum Reference
50 (Hz)
3-15 Reference 1 Source
[7] Pulse Input 29
Table 6.8 Open Loop Settings (Follower)
The terminal 29 is used as a pulse input for the reference
signal and must be scaled.
5-** Digital In/Out (Follower)
Example/Remarks
5-02 Terminal 29 Mode
[0] Input
5-13 Terminal 29 Digital Input
[32] Pulse Input
5-50 Terminal 29 Low Frequency
0 (Hz)
5-51 Terminal 29 High Frequency
5000 (Hz)
5-52 Term. 29 Low Ref. Value
0
5-53 Term. 29 High Ref. Value
50 (Hz)
5-10 Terminal 18 Digital Input
Start
Table 6.9 5-** Digital In/Out (Follower)
6.1.4 Sleep Mode
The following describes how to configure the frequency
converter for de-staging the last variable speed pump in
applications with more than one frequency converter.
The necessary steps for the configuration are:
1.
Set parameter 27-34.01 higher than the minimum
speed in
4-11 Motor Speed Low Limit [RPM]
/
4-12 Motor Speed Low Limit [Hz]
to enable sleep
function (setting it to zero will disable the
function).
2.
Set
27-21 Override Limit
to wake up the
application.
After wake up the pump with the least running hours
starts.
NOTICE
If the master drive does not wake up properly, the
frequency converter is not able to reach its de-staging
speed and the delays in parameter group 27-** have to
be adjusted.
Stage ON [Hz]
Stage OFF [Hz]
Stage 1 48.5 (i.e. parameter 2732.1) 30 (i.e. parameter 2734.1)
Stage 2 48.5 (i.e. parameter 2732.2) 40 (i.e. parameter 2734.2)
Stage 3 - (i.e. parameter 2732.3)
42 (i.e. parameter 2734.3)
Table 6.10 Example Settings for 27-3*, 3 Pumps with
Sleep Mode Enabled
•
“Stage X” refers to the stage the cascade is
running in (stage 1
⇒
cascade is running in stage
1, only 1 pump is running)
•
Pumps 2 and 3 are started on 48.5 Hz
•
Pump 3 is stopped on 42 Hz, Pump 2 is stopped
on 40 Hz and Pump 1 is stopped on 30 Hz
•
It might be necessary to fine adjust the stage
on/off speeds to optimise the energy
consumption, if not auto tuned. It is
recommended to use Auto Tune Staging Speeds
by enabling the feature in
27-30 Auto Tune
Staging Speeds
.
NOTICE
Parameter 2732.3 is irrelevant in this case, because there
is nothing left to stage on in stage 3.
Configuration Examples
VLT
®
AQUA Drive MCO 101/MCO 102
42
MI38C402 - VLT
®
is a registered Danfoss trademark
6
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