ABB ACH550-01 User Manual page 108

5. Condenser
This application macro is for condenser and liquid cooler
applications where the fan speed is controlled according to the
signals received from the transducer. See the figure below.
When using a direct speed reference in the AUTO mode, the
speed reference must be connected to analog input 1 (AI1) and
the START command is given with digital input 1 (DI1). In the
HAND/OFF mode, the speed reference and START command
are given through the control panel (operator keypad).
If process PI(D) is used, the feedback signal must be connected
to analog input 2 (AI2). By default, the setpoint is set from the
control panel, but it can also be changed to analog input 1.
Process PI(D) must be commissioned and adjusted with
parameters
control assistant (recommended).
96
(Group 40: PROCESS PID SET
ACH550 User's Manual
1) or using the PID
Application macros and wiring