Taco SKV SelfSensing

Taco® SKV
26
302-365, Effective: June 5, 2017
© 2017 Taco, Inc.
8.4.5 Control from external PLC/BMS through Analog Input
This set-up allows an external control source such as a PLC or BMS controller to provide: a) the process variable, b)
the setpoint or c) a speed reference. The output from the external control device can be either a voltage or current sig-
nal. The analog input configuration switches must be set to the correct type of output signal. The drawing below shows
the connections for this configuration.
This wiring scheme is used with Set-up 2, as shown in “10.1 SelfSensing Description” on page 34.
Figure 8-24: Terminal Wiring for External Control Source
39
COM
42
AOUT
50
+10V
53
A IN
55
COM
54
A IN
12
+24V
13
+24V
18
D IN
19
D IN
27
D IN
29
D IN
32
D IN
33
D IN
20
COM
I/O Analog I/O Digital
COM
AI
Unit Receiving
Analog Output
[6-50]
[137] Speed*
4-20 mA
* factory default
Starting/Stopping
Controller
[5-10]
[8] Start*
Start: Closed
* factory default
AO
COM
PLC or BMS
Control Signal
[Group 6-]
[Group20-]
(See Table)
Set A54=U for 0-10V
Set A54=I for 4-20mA
Table 6: Parameter Configuration for Use of an External Control Signal
Parameter
Number
Parameter
Description
For process variable from
BMS/PLC*
For setpoint from BMS/ PLC**
For speed reference
from BMS/PLC***
1-00 Configuration Mode Closed Loop Closed Loop Open Loop
3-15 Reference 1 Source No Function Analog Input 54* Analog Input 54*
6-24 Terminal 54 Low Ref./
Feedb. Value
Minimum value of process vari-
able. For example, for a 0-60PSI
transducer, set to 0.
Minimum reference/setpoint
value. For example, for a 0-
60PSI DP transducer, set to 0.
Minimum motor speed.
For example, 0 RPM.
6-25 Terminal 54 High
Ref./Feedb. Value
Maximum value of process vari-
able. For example, for a 60PSI
transducer, set to 60.
Maximum reference/setpoint
value. For example, for a 60PSI
DP transducer, set to 60.
Maximum motor speed.
For example, 2950
RPM.
6-27 Terminal 54 Live Zero Enabled Enabled Disabled
20-00 Feedback 1 Source Analog Input 54 Select as appropriate for applica-
tion. This can be any selection
except the setting of parameter
3-15.
No Function
20-12 Reference/Feedback
Unit
Select as appropriate for appli-
cation. For example, set to PSI
when using pressure feedback.
Select as appropriate for applica-
tion. For example, set to PSI
when using pressure reference.
NA
20-14 Maximum Reference/
Feedback
Maximum transducer feedback
value. For example, for a 60PSI
transducer, set to 60 PSI.
Maximum reference/setpoint
value. For example, for a 60PSI
transducer, set to 60 PSI.
NA