System 350 A350P Electronic Proportional Plus Integral Temperature Control Product/Technical Bulletin
5
Reverse or Direct Acting Operation
With the operation jumpers in the Reverse Acting (RA)
position, the analog output increases as the
temperature drops below setpoint. (See Figure 5.)
With the operation jumpers in the Direct Acting (DA)
position, the analog output will increase as the
temperature rises above the setpoint.
Select the RA/DA mode by positioning the operation
jumpers vertically or horizontally. (See Figure 2.)
Position the operation jumpers vertically for RA and
horizontally for DA.
The RA/DA operation jumpers are installed in the RA
mode at the factory.
Note: Dashed areas show throttling range possibilities
from minimum to maximum.
VDC
Throttling Range
Setpoint
10
0
RA
20
10
0
mA
Setpoint
Throttling Range
10
0
VDC
DA
20
10
0
mA
5F
°
5 10 15 20 25 30F°
+
-
10
15
20
25
30
Reverse Acting
Direct Acting
Figure 5: RA and DA Proportional Bands Shown in
Proportional-Only Mode
A
dd-on Modules
The maximum number of add-on modules is listed in
Table 1.
Table 1: Maximum Number of S350 Stage
Modules per A350P
Power
Source
Number
of S350A
or S350C
Stage
Modules
Allowed
Number of
S350A or
S350C
Modules
(with
One S350P)
Allowed
Number of
S350A or
S350C
Modules
(with
Two S350Ps)
Allowed
Y350R
4
2
0
External
Class 2
Transformer
9
8
7
S350A On-Off Stage Modules
S350A On-Off stage modules receive power, setpoint,
and sensor input from the A350P control. S350A stage
modules perform switching functions based on the
control’s setpoint and sensor information, as well as
the offset and differential selected at the S350A stage
module.
For more information on these modules, refer to the
System 350
TM
S350 Temperature, S351 Humidity,
and S352 Pressure On/Off Stage Modules
Product/Technical Bulletin (LIT-930080)
.
S350C Slave Stage Module
S350C slave stage modules receive power and sensor
input from the A350P control. S350C slave stage
modules perform switching functions based upon the
control’s sensor information, as well as the setpoint
and differential selected at the S350C stage module.
For more information on these modules, refer to the
System 350
TM
S350C Temperature Slave Stage
Module Product/Technical Bulletin (LIT-930084)
.
S350P Proportional Stage Modules
S350P proportional stage modules receive power,
setpoint, and sensor input from the A350P control. The
S350P stage module responds with an analog 0 to
10 VDC and 0 to 20 mA output signal. This is based
upon the control’s setpoint and sensor information, as
well as the offset, throttling range, and minimum output
selected at the S350P stage module.
For more information on these modules, refer to the
System 350
TM
S350P Proportional Plus Integral
Temperature Stage Module Product/Technical Bulletin
(LIT-930086)
.
