Honeywell SmartVFD HVAC MR4 User Manual page 134

HVAC A
PPLICATION
3.5.16 Group 3.14: Pump and Fan Cascade
The Multi-pump functionality allows you to control up to 4 motors (pumps, fans) with PID con-
troller 1. The 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 or-
der/priority in which the motors are started in order to guarantee their equal wear. The control-
ling 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, us-
ing the motor Interlock function. See page 82.
Code Parameter
M3.14.1 Number of motors
M3.14.2 Interlock function
M3.14.3 Include FC
M3.14.4 Autochange
M3.14.5 Autochange interval
Autochange: Fre-
M3.14.6
quency limit
Autochange: Motor
M3.14.7
limit
M3.14.8 Bandwidth
M3.14.9 Bandwidth delay
Min Max Unit
1 4
0 1
0 1
0 1
0.0 3000.0 h
0.00 50.00 Hz
0 4
0 100 %
0 3600 s
Table 50. Multi-pump parameters
Default ID
Total number of motors
1 1001 (pumps/fans) used in multi-
pump system
Enable/Disable use of inter-
locks. Interlocks are used to
tell the system if a motor is
1 1032
connected or not.
0 = Disabled
1 = Enabled
Include the drive in the
autochange and interlocking
1 1028 system.
0 = Disabled
1 = Enabled
Disable/enable rotation of
starting order and priority of
0 1027 motors.
0 = Disabled
1 = Enabled
After the expiry of the time
defined with this parameter,
the autochange function
48.0 1029 takes place if the capacity
used lies below the level
defined with parameters
M3.14.6 and M3.14.7.
These parameters define the
25.00 1031
level below which the capac-
ity used must remain so that
the autochange can take
1 1030
place.
Percentage of the setpoint.
E.g.: Setpoint = 5 bar, Band-
width = 10%: As long as the
10 1097 feedback value stays within
4.5...5.5 bar motor discon-
nection or removal will not
take place.
With feedback outside the
bandwidth, this time must
10 1098
pass before pumps are
added or removed.
Honeywell • 62
Description