Product Overview

6 System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
I
nstallation and Wiring
The A350A/B Temperature Control is housed in a
compact NEMA 1 plastic enclosure designed for
standard 35 mm DIN rail mounting. The A350A/B is not
position sensitive but should be mounted for convenient
wiring and adjustment. Four key-slot mounting holes on
the back of the control case are provided for surface
mounting. Add-on modules must plug into the right side
of the A350A/B control.
Note: When mounting the System 350 modules to rigid
conduit, attach the hub to the conduit before
securing the hub to the control enclosure.
!
WARNING: Risk of Electric Shock.
Disconnect the power supply
before making electrical
connections. Contact with
components carrying hazardous
voltage can cause electric shock
and may result in severe
personal injury or death.
AVERTISSEMENT:Risque de décharge
électrique.
Débrancher l'alimentation avant
de réaliser tout branchement
électrique. Tout contact avec des
composants porteurs de tensions
dangereuses risque d'entraîner
une décharge électrique et de
provoquer des blessures graves,
voire mortelles.
 All wiring must conform to the National Electrical
Code and/or local regulations.
Note: For maximum electrical rating of control, see
label inside the control cover or Specifications
section. Use copper conductors only.
 Consult the typical wiring diagrams (Figures 4 and 5)
for proper wiring and terminal designations.
A350A/B
D350
S350A
Sensor
Load
Load
L
L
24
VAC
1
1
2
2
24V
COM
VDC
SEN
Note: If sensor is mounted less than 50 ft
(15.2 m) from the A350A/B,
shielded cable is not required.
Figure 4: Typical Wiring Diagram for A350A/B
Powered by an External 10 VA Transformer
Sensor Connection
Shielded cable is not generally required for sensor
wiring on runs of less than 50 ft (15.2 m), but is
recommended for lengths greater than 50 ft (15.2 m).
When using shielded cable, isolate and tape the shield
at the sensor. Connect the shield to the COM sensor
terminal on the A350A/B. (See Figure 2 for terminal
location.) The A99BA-200C sensor, which includes
shielded cable, is available if needed.
Note: At the maximum cable lengths listed in Table 2,
no more than 1F° (0.6C°) error in the sensed
temperature will result due to wire resistance.
Table 2: Recommended Maximum Sensor
Cable Lengths
Wire
Shielded Cable Length
*
Gauge
Feet Meters
14 AWG
800 244
16 AWG
500 152
18 AWG
310 94
20 AWG
200 61
22 AWG
124 38
* Values provided are for 2-wire stranded cable.