HVAC400X – APPLICATION MANUAL
149
EN2B-0417GE51 R0719
Fig. 44. The Pump and Fan Cascade function
Legend
A.
Bandwidth.
D.
Delay.
B.
Feedback.
E.
ON.
C.
Setpoint.
F.
OFF.
When to connect and/or add motors:
• The feedback value is not in the bandwidth area.
• The regulating motor operates at a close to maximum frequency (-2 Hz).
• The conditions above are true for longer than the bandwidth delay.
• There are more motors available
When to disconnect and/or remove motors:
• The feedback value is not in the bandwidth area.
• The regulating motor operates at a close to minimum frequency (+2 Hz).
• The conditions above are true for longer than the bandwidth delay.
• There are more motors that operate than the regulating one.
P3.15.1 NUMBER OF MOTORS (ID 1001)
You can use this parameter to set the total number of motors/pumps used with the Pump and Fan Cascade
system.
P3.15.2 INTERLOCK FUNCTION (ID 1032)
You can use this parameter to enable or disable the interlocks.
The interlocks tell the Pump and Fan Cascade system that a motor is not available. This can occur when the motor
is removed from the system for maintenance or bypassed for manual control.
To use the interlocks, enable the parameter P3.15.2. Make a selection of the status for each motor with a digital
input (the parameters from P3.5.1.25 to P3.5.1.28). If the value of the input is
CLOSED
, that is, active, the motor is
available for the Pump and Fan Cascade system.
0 Hz
t
C
M1
M2
B
A
D
E
F
E
F
