| Output Y1 provides the OPEN command, and Y2 the CLOSE command to the 3- |
signal | position actuator. |
| The factory setting for the actuator runtime is 150 seconds. It can be adjusted via |
| parameter P44 (Y1 and Y2). |
| The parameter is only visible if |
Synchronization | 1. When the thermostat gets powered up, a closing command for the actuator |
| runtime + 150 % is provided to ensure that the actuator fully closes and |
| synchronizes to the control algorithm. |
| 2. When the thermostat calculates the positions "fully close" or "fully open", the |
| actuator runtime is extended + 150 % to ensure the right actuator position |
| synchronized to the control algorithm. |
| 3. After the actuator reaches the position calculated by the thermostat, a waiting |
| time of 30 seconds is applied to stabilize the outputs. |
PWM control | The demand calculated by PI control from the current room temperature and set- |
| point is provided via Y1 to the valve actuator as a PWM signal (Pulse width |
| modulation) for thermic actuators. The output is switched on for a period proportio- |
| nal to the heat/cool demand and then switched off for the rest of the PWM interval. |
| The interval is 150 sec (factory setting). It can be adjusted via parameters P44 |
| (Y1). The parameters are only visible if |
PWM for thermic | For thermic valve actuators, set the running time to 240 sec. |
valve actuators | • Never apply PWM to a motoric actuator. |
Note! | |
| • It is not possible to ensure exact parallel running of more than one thermic valve |
| actuator. If several fan coils are driven by the same thermostat, preference |
| should be given to motoric actuators. |
PWM for el. heaters | For electric heaters, set the running time to 90 sec. |
| In order to avoid |
| current valve instead of a relay or contactor. |
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Siemens | RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation | CE1P3182en |
Building Technologies | Functions | 28 May 2009 |