Specifications
170 Rockwell Automation Publication PFLEX-AP009A-EN-P - September 2012
Chapter 2 Wiring Examples
Figure 118 - Three-wire Control with Pot Speed Reference 
22
21
20
19
18
17
15
14
13
1
7
8
9
10
11
12
23
24
5
6
2
4
3
27
26
25
30
29
28
Analog Out Common
Analog Out 2
1397 Regulator Board
16
15
14
13
1
7
8
9
10
11
12
5
6
2
4
3
Analog In 1 (+)
Analog In 1 (-)
Analog In 2 (+)
Analog In 2 (+)
Pot Common
17
18
20
19
- 10V Pot Reference
+24V DC Supply
Digital Input Common
24V Supply Common
Digital Input 1
Digital Input 2
Digital Input 3
Digital Input 4
+ 10V Pot Reference
Stop/CF 
Start
PowerFlex DC
Analog Input 3 (+)
Analog Input 3 (-)
TB1
Pot Ground
TB2
Not Used
PE Ground
Internal 0V (Grd)
• Conguration:
P1322 [Direction Mode] = 1 “Bipolar”
P70 [Anlg in1 Sel] = Speed Ref A
P71 [Anlg In1 Cfg] = +/- 10
Note: DIP switch S9 should be
set to “On”
P133 [Digital In1 Sel] and P134 [Digital 
In2 Sel] are kept at their default setting, 
“Stop/CF” and “Start” respectively.
- Refer to the PowerFlex DC User 
Manual, Publication 20-p-um001, Chapter 
1: Installation and Wiring, for more 
details on wiring examples. 
• Adjust Scaling:
P72 [Anlg In1 Scale]
P73 [Anlg1 Tune Scale]
• View Signal Value:
P1404 [Analog In1 Value]
• View Signal Output:
P385 [Speed Ref Out]
16
+24VDC
Run
(1) (2)
Stop
(1)
Jog
Reverse / Forward
Reference Select
+24VDC
Coast-to-Stop
(1)
Customer Interlock
(1)
Fault Alarm Reset
+24VDC
Brush Wear
(1)
Motor Thermostat
(1)
+24VDC
+24VDC Common
+10VDC (Isolated)
Analog Reference 2 (+)
Analog Reference 2 (-)
Analog Reference 1 (+)
Analog Reference 1 (-)
Stop
Start
NOTE: If your 1397 drive utilizes 115 VAC Inputs, refer to 
the PowerFlex DC user manual, Appendix G for details on 
the 115V AC to 24V DC I/O Converter Circuit Board. 
Clear Fault
31
32
Analog Tachometer In (+)
Analog Tachometer In (-)
Analog Tachometer In (Com)
Analog Out 1
Running (N.O.)
Alarm (N.O.)
No Fault (N.O.)
• Conguration:
P91 – [Ref 2 Source] = 1 “Speed Pot”
• Scaling:
P130 – [Anlg In 2 Gain]
P131 – [Anlg In 2 Zero]
- Refer to the Jumper and Adjustment 
Settings table in the 1397 User Manual, 
Publication 1397-um000 for additional details.
(1) Require for initial startup and operational 
checks. Voltage must be present at these points 
during operation. In other words, these 
terminals must be made. If open, the drive will 
be ‘Not Ready’. 
(2) RUN – Edge sensitive signal that initiates a 
Run command (0   1 = Run). If the Drive is 
Run, voltage may be applied to the armature 
causing the motor to reach the desired speed. 
The Run input is latched and therefore does not 
have to be maintained to keep the drive 
Running.
Three-wire Control, Pot Speed Ref










