User Manual

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Siemens Building Technologies Room Temperature Controllers CE1N3046en
HVAC Products 22.08.2003
Functions
The controller acquires the room temperature with its integrated sensor and maintains
the setpoint by delivering control commands. The proportional band or the switching
differential can be 1 or 4 Kelvin in heating mode and 0.5 or 2 Kelvin in cooling mode
(selectable with DIP switch no. 4).
Y
1[%]
100
0
T [°C]
100
Y10 [%]
Xdz
SDH
XpH
XpK
W
2 P.
3046D01
VR
T Room or return air temperature
Y1,Y10 Output percentage
W Room temperature setpoint
Xdz Dead band
XpH Proportional band heating
XpK Proportional band cooling
SDH Switching differential heating
VR 0-100 % min. limitation of
cooling output
2 P. 2-position output
Y
1,Y2 [%]
Y10 [%]
T [°C]
100
0
XpH
XpK
Xdz
VR
W
3046D02
T Room or return air temperature
Y1,2 Y10 Output percentage
W Room temperature setpoint
Xdz Dead band
XpH Proportional band heating
XpK Proportional band cooling
VR 0-100 % min. limitation cooling
output
Using the potentiometer at the rear of the controller, the cooling signal output can be
limited to a minimum value of between 0 and 100 %. This function can be used to en-
sure a minimum supply air volume. When used in connection with a VAV controller, this
setting must be taken into account.
If “Pulse width modulation“ (PWM) for the heating output is selected with DIP switch no.
6, the output is switched on and off for a certain period of time, proportional to the cal-
culated manipulated variable and following an interval. The interval of the PWM actu-
ating signal can be selected and is 90 or 240 seconds (DIP switch no. 7)
When used in connection with thermic actuators, the selected interval should be 240
seconds. When using electric heaters, it should be 90 seconds.
When used in connection with electric valve actuators, DIP switch no. 6 must be set to
ON for two-position control with ON / OFF control commands.
PWM actuating signals may never be used for driving electric actuators!
Outputs Y1 = opening, Y2 = closing and G = power supply are used to drive three-
position actuators with a maximum running time of 150 seconds from the fully closed to
the fully open position.
When commissioning the controller, an opening signal of 200 seconds is delivered,
followed by a closing signal of 200 seconds to ensure the actuator will be fully closed.
When the actuator has reached the position calculated by the controller, a waiting time
of 30 seconds is observed in order to stabilize the outputs.
The control outputs carry AC 24 V.
Signal input B1-M is used for outside temperature compensation. Using a DC 0... 10 V
signal, the setpoint can be shifted by + / - 12.5 Kelvin. The neutral position is at DC 5 V
and means no setpoint shift.
Function diagram
“Heating-cooling“
with minimum
limitation cooling
RCU60 and 60.1
Function diagram
“Heating-cooling“
with minimum
limitation cooling
RCU61 and 61.1
Minimum limitation of
cooling signal
Pulse width
modulation (RCU60…)
Note
Caution
Three-position
control signal
(RCU61/61.1)
Setpoint shifting