Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 41)

* Set switch A53 = U, parameters 612 and 613 are hidden when A53 = U.
** Set switch A53 = I, parameters 610 and 611 are hidden when A53 = I
*** Set to use AI54, set to Analog Input 54, configure parameters 620/1 or 622/3, 642, 625
and 62.
Control from external PLC/BMS through Analog Input
The controller can be configured to accept either the process variable (e.g. actual
pressure) or setpoint from an external control source such as a PLC or BMS controller
through an analog input. The output from the external control device can be either a
voltage or current output signal. Be sure to set the analog input configuration switches
based on the type of output signal. When the process variable is supplied by the external
controller, the wiring connections are the same as used with the connections for speed
control from an external device through an analog input. When the setpoint or reference
is supplied to the controller from the external device both a transducer and the external
control device supplying the setpoint need to be connected to the controller. Refer to the
wiring diagram below. The parameter settings for this configuration are shown below.
Figure 25: Connections for setpoint control through an external device
Table 9: Parameters for external PLC/BMS
Parameter Number Parameter Description For setpoint from BMS/PLC
3-15 Reference 1 Source Analog Input 54
6-22* Terminal 54 Low Current Minimum current value for the signal
from the BMS/PLC.
6-23* Terminal 54 High Current Maximum current value for the signal
from the BMS/PLC.
6-25 Terminal 54 High Ref./Feedb. Value Maximum reference/setpoint value.
For example, for a 300psi maximum
setpoint, set to 300.
6-27 Terminal 54 Sensor Fault Enabled
20-00 Feedback 1 Source Select as appropriate for application.
This can be any selection except the
setting of parameter 3-15.
20-12 Reference/Feedback Unit Select as appropriate for application.
For example, set to psi when using
pressure reference.
20-13 Minimum Reference/Feedback Minimum reference/setpoint value.
For example, for a 0-300psi
transducer, set to 0 psi.
20-14 Maximum Reference/Feedback Maximum reference/setpoint value.
For example, for a 300psi transducer,
set to 300 psi.
Electrical Installation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 39