Data Sheet for Product
Technical Instructions Polygyr-Compact Immersion Temperature Controller
Document Number CM1N3409E-P25
Rev. 1, February, 2000
Page 2
Siemens Building Technologies, Inc.
Function
The RCE61.21 provides PI control. Its proportional band is adjustable and three
different integral action times can be selected. The controller compares the actual value
with the set point and generates two control signals when a deviation occurs. The
control signals are switched in sequence. They are continuous and have a range of
0 - 10 Vdc. When the control signal changes from 0 – 10 Vdc, the correcting variable
changes from 0 - 100%, i.e., there is a proportional relationship between the correcting
variable and the control signal.
Y
Y1Y2
Xp2 Xp1
0
Q
10V
SASC0030R1
Q
Y1
Y2
Load
Signal voltage
Signal voltage
Heating
Figure 2.
Design Features
The RCE61.21 is a small, electronic controller that combines electronics, setting unit
and sensing element into one unit.
The casing is plastic with a removable cover. The immersion detector stem with nickel
measuring element is fitted at the rear of the unit.
All setting devices and connecting terminals are contained in the housing and
accessible only when the cover is removed.
1 Setting scale
2 Slider for setting the desired value
3 Setting potentiometer for P band Xp1
4 Setting potentiometer for P band Xp2
5 Connecting terminals
6 Central mounting screw
7 Service plug
8 Shorting plug for integral action time
Figure 3.
The scale and slider for setting the desired temperature can be seen through a window
in the cover. Knock-out holes (Pg11) provide entry for the cables.
To facilitate mounting in the pipe work, the controller has a male thread and mounting
nut (standard version). The immersion detector stem, threaded bushing and mounting
nut are made of corrosion-proof CrNiMo steel. The latter provides metallic insulation, so
a protection well is not required (see
Accessories
).
The controller should not be removed form the pipe work if servicing is required. Two
printed circuit boards carry the controller electronics and setting devices. They can be
removed from the housing after the cables have been disconnected and the central
mounting screw loosened.