Installation Instructions

Document No. 550-165
Installation Instructions
October 26, 2016
Page 4 of 11 Siemens Industry, Inc.
Wiring for AI with a 4 to 20 mA Sensor.
CAUTION
Each 4-20 mA sensor requires a
SEPARATE dedicated power limited
24 Vdc power supply.
DO NOT use the same transformer
to power both the sensor and the
controller.
NOTE:
If the voltage/current switch is set to
current and a 4 to 20 mA sensor is
connected to an AI, then special wiring
requirements must be followed.
NOTE:
The controller’s DOs control 24 Vac loads
only. The maximum rating is 12 VA for each
DO. An external interposing relay is required
for any of the following:
• VA requirements higher than the maximum
• 110 or 220 Vac requirements
• DC power requirements
• Separate transformers used to power the
load
(for example, part number 540-147,
Terminal Equipment Controller Relay
Module)
NOTE:
When wiring any actuator that uses a 0 to
10V control signal and ties AC neutral to DC
common, an additional wire must connect
the actuator AC neutral to the DC common
of the PTEC/TEC AO being used to control
the actuator.
24 Vac Modulating Control.
Actuator
Symbol
TEC
Connection
Function
Terminal
Connection
Standard
Color
1
H
Supply (SP)
G
Red
2
C
Neutral (SN)
G0
Black
8
AO3 – 15
(+)
0 to 10V
input signal
Y
Gray
--
C to AO3
16 (-)
Common
jumper
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