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Summary of Contents for industrie technik DB-TA-33A
- Page 2 The series of thermostats DB-TA-33A allow the temperature control in buildings interiors for heating, air conditioning with 2 or 4 pipe systems with proportional integral regulation. The unit has one 0..10 V output (2 pipe system) or two 0..10 V outputs (4 pipe...
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Page 3: Parameters Setting
ParaMETErS SETTing LEVEL 1: Setpoint: It allows to fix the setpoint that corresponds to the room temperature required. Setting range: 6,0...45,0 20,0 °C default value: °C Password: access key to level 2: PAS=6.5. access key to level 3: PAS=8.5. (only if remote sensor is used) Setting range: 6,0...45,0 default value:... - Page 4 (1) DB-TA-33A-13A (1) DB-TA-33A-13A Fig. 1 Fig. 2 Manual reset: Changing the value of this parameter it is possible to move the proportional band around the setpoint. The unit is in volt. Setting range: 0,0...10,0 5,0 Volt default value: Volt...
- Page 5 ui5 = “ Li” -> liquid sensor visualized (temperature can be visualized up to a value around 75°C. If water temperatu- re sensor is upper 75°C the message “97.0” is visualized) 4 pipe systems operating mode Proportional heating band: The proportional heating band is the part of heating output that changes proportionally with error signal. The setpoint is at the beginning of the proportional heating band.
- Page 6 LiVELLO 3: aUTOTUning The level 3 is accessible only with the password 8.5 and if the unit uses remote air sensor. With the use of internal sensor it is not possible to use the autotuning function. This function allows the calculation of parameters Bp, Ti automatically by doing an on/off cycle. Before doing such a cycle, set the setpoint for autotuning.
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Page 7: Technical Features
proportional band BpH=BpC and integral time Ti are calculated. ErC :initial autotuning cycle error. The cycle didn’t begin correctly. For instance if operating season is heating in 2 pipe system and the temperature is upper than the setpoint at the begining of autotuning cycle, it is not possible to start the cycle. -
Page 8: Electrical Wiring
ELECTriCaL wiring tiP = 2 (2 pipe system) tiP = 2 (2 pipe system) StA= rEM (see parameters) StA=H o C (see parameters) (1) DB-TA-33A-13A (1) DB-TA-33A-13A tiP = 4 (4 pipe system, see parameters) Jumper layout (1) DB-TA-33A-13A J1, J2 closed = internal sensor... - Page 9 In some cases the autotune function does not perform well or does not perform at all: 1. The system is affected by process disturbances external to the control loop during autotuning (windows opened, load variation) 2. The system is very dynamic. This is the case in which the heating or cooling power is too high for the volume of room regulated. Considering the conditions for autotuning cycle, some large overshoots can be verified.
- Page 10 To set parameters manually, each parameter must be set. One can apply the method of test and error. Method 1: Proportional band setting: 1. Set the parameter Ti to noI in order to put the regulator in proportional regulator only. 2.
- Page 11 T2-T1 - POE According to Ziegler-Nichols one obtain: - for a P regulator: Bp = (t1 * K ) / t2 - for a PI regulator: Bp = (1.11 * t1 * K) / t2 = 3.33 * t1 At the end of the test do not forget to set parameter POE to PI in order to use the unit as an automatic regulator. MOUnTing OPENING THE COVER MOUNTING OF THE UNIT AND CLOSING OF THE COVER...