Vacon 100 INDUSTRIAL Applications Manual - page 55
3
vacon • 53
VACON HVAC Drive Application
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3.5.15
Group 3.14: Multi-pump
The
Multi-pump
functionality allows you to control up to 4 motors (pumps, fans) with PID con-
troller 1. The AC drive is connected to one motor which is the "regulating" motor connecting
and disconnecting the other motors to/from the mains, by means of contactors controlled with
relays when needed in order to maintain the right setpoint. The
Autochange
function controls
the order/priority in which the motors are started in order to guarantee their equal wear. The
controlling motor can be included in the autochange and interlocks logic, or, it may be selected
to always functions as Motor 1. Motors can be taken out of use momentarily, e.g. for service,
using the motor
Interlock function
Table 46. Multi-pump parameters
Code
Parameter
Min
Max
Unit
Default
ID
Description
P3.14.1
Number of motors
1
4
1
1001
Total number of motors
(pumps/fans) used in multi-
pump system
P3.14.2
Interlock function
0
1
1
1032
Enable/Disable use of inter-
locks. Interlocks are used to
tell the system if a motor is
connected or not.
0 = Disabled
1 = Enabled
P3.14.3
0
1
1
1028
Include the frequency con-
verter in the autochange and
interlocking system.
0 = Disabled
1 = Enabled
P3.14.4
0
1
0
1027
Disable/enable rotation of
starting order and priority of
motors.
0 = Disabled
1 = Enabled
P3.14.5
Autochange interval
0.0
3000.0
h
48.0
1029
After the expiry of the time
defined with this parameter,
the autochange function
takes place if the capacity
used lies below the level
defined with parameters
P3.14.6 and P3.14.7.
P3.14.6
Autochange: Fre-
quency limit
0.00
50.00
Hz
25.00
1031
These parameters define the
level below which the capac-
ity used must remain so that
the autochange can take
place.
P3.14.7
Autochange: Motor
limit
0
4
1
1030
P3.14.8
Bandwidth
0
100
%
10
1097
Percentage of the setpoint.
E.g.: Setpoint = 5 bar, Band-
width = 10%: As long as the
feedback value stays within
4.5...5.5 bar motor discon-
nection or removal will not
take place.
P3.14.9
Bandwidth delay
0
3600
s
10
1098
With feedback outside the
bandwidth, this time must
pass before pumps are added
or removed.