Siemens RWD68 Universal Controller Parameter Settings
In this blog post, we are going to look at the basic functions and parameter settings for Siemens RWD series universal controllers to ensure optimal performance.🌬️🛠️
📖Welcome to Insight Control System Blog
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| Control Parameter |
✅ OVERVIEW:
- The Siemens RWD series Controller is an advanced digital controller used in HVAC and building automation systems.
- It is designed for modulating control of temperature, pressure, and humidity in heating, ventilation, and air conditioning applications.
- The Siemens RWD32 and RWD82 universal controllers are intended for Heating, Ventilating, Air-Conditioning and Refrigeration in comfort control plants.
- Measurement and control of temperature, relative humidity, absolute humidity, enthalpy, pressure differential, volumetric airflow and indoor air quality.
- The controller must be configured for plant-specific operation using standard application number.
✅ INPUTS & OUTPUTS:
RWD32 Controller
- Operating voltage: AC 230 volt,
- No. of Universal input (UI) or Analog Input (AI): 2,
- No. of Digital input (DI): 1,
- No. of Digital Output (DO): 2
RWD82 Controller:
- Operating voltage: AC 24 volt,
- No. of Universal input (UI) or Analog Input (AI): 2,
- No. of Digital input (DI): 1,
- No. of Digital Output (DO): 2
RWD32
RWD82
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| RWD32 |
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| RWD82 |
Type Reference: RWD68
- Operating Voltage: AC 24 volt,
- Universal Input: 2,
- Digital Input: 1,
- Analog Output: 1,
- Digital Output: 1,
Siemens HVAC Controller
- The RWD68, RWD32 and RWD82 is a stand-alone universal controller which performs both primary and auxiliary control functions.
- The respective mode is defined by entering the corresponding configuration and setting parameters via the push buttons on the controller or the software tool.
Universal input X1:
- The universal input X1 is used as the primary input for a Ni 1000 temperature sensor,
- a Pt 1000 temperature sensor or a 0-10 V DC active input.
Universal input X2:
- The universal input X2 is used as the secondary input for a Ni 1000 temperature sensor, a Pt 1000 temperature sensor,
- an active / passive remote setpoint transmitter or a 0-10 V DC active input.
Digital input D1:
- The digital input D1 is used to select the day/night changeover.
- Changeover occurs via potential-free contacts between D1 and M.
Digital outputs Q:
- Each output Q (Q1, Q2) can be configured for either reverse or direct acting.
- Q is a digital output that supports AC voltage ranging from 24 to 230 V.
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| Siemens HVAC Controller |
✅ OPERATING & DISPLAY ELEMENTS:
- The RWD32 and RWD82 are operated by the buttons on the controller front.
- Additional tools are not necessary.
- A 9-pin port is provided for optional programming via the software tool.
LCD DISPLAY
The LCD shows the following information for normal operation:
- Current operating values (maximum 4 digits),
- Current setpoints (day/night),
- Application number,
- Control sequencing diagram,
- Auxiliary input value,
- Selected auxiliary function,
- The controller has three operating buttons for the following functions,
- The SELECT button is used to enter or save the value adjustment.
- The Up/Down or Increment/Decrement operating buttons are used for viewing and adjusting parameters.
Software Tool:
- A software tool for controller application selection and parameter adjustment is available.
- It is a user-friendly Windows 95 (or) above based software tool which provides you a printout of the controller settings.
✅ PROGRAMMING SCREEN:
- PS-1 Parameter Setting Mode: Application No. Setup,
- PS-2 Parameter Setting Mode: Defining Unit, X1 and X2,
- PS-3 Parameter Setting Mode: Auxiliary Control,
- PS-4 Parameter Setting Mode: Main Control Loop Setting,
- PS Next To enter the next Parameter Setting,
- PS Exit To exit the whole Parameter Setting Mode,
🔵 PS1 - Application No. Selection:
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| PS1 |
Name | Description | Display, Setting Range |
LIM ABS | Absolute Limiter | - |
WIN/SUM diG | Winter/Summer changeover by digital input | - |
Act | Active sensor input | - |
LIM rEL | Relative Limiter | - |
WIN/SUM AnLG | Winter/Summer changeover by analogue input | - |
🔵 PS2 - Unit, X1 & X2 sensor type and sensing range definition:
Name | Description | Display, Setting Range |
UNT | Unit define | °C, °F, % or ----(no unit display) |
X1LS | X1 is Landis & Staefa Ni 1000Ω temperature sensor | Ni 1000Ω: -50.150°C (unchangeable) |
X2LS | X2 is Landis & Staefa Ni 1000Ω temperature sensor | Ni 1000Ω: -50.150°C (unchangeable) |
X1Pt | X1 is Platinum Pt 1000Ω temperature sensor | Pt 1000Ω: -20.180°C (unchangeable) |
X2Pt | X2 is Platinum Pt 1000Ω temperature sensor | Pt 1000Ω: -20.180°C (unchangeable) |
X1 0-10 | X1 is 0-10 Vdc input sensor | 0-10 Vdc: -100.8000 |
X2 0-10 | X2 is 0-10 Vdc input sensor | 0-10 Vdc: -100.8000 |
ΔX1 | Calibration offset for X1 (Ni & Pt sensor only) | -5.5 K or -9°F.9°F |
ΔX2 | Calibration offset for X2 (Ni & Pt sensor only) | -5.5 K or -9°F.9°F |
X2 L | Start point of the X2 (for 0-10 Vdc only) | -100.8000 |
X1 H | Stop point of the X1 (for 0-10 Vdc only) | -100.8000 |
X2 H | Stop point of the X2 (for 0-10 Vdc only) | -100.8000 |
X2VR | Variable Resistor | 0.1000 Ω |
🔵 PS3 - Auxiliary Control Loop Setup:
Name | Description | Display, Setting Range |
XP-h | Proportion band for heating |
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XP-c | Proportion band for cooling |
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XP-r | Proportion band for reverse acting | Active input: 0.05.7300 |
XP-d | Proportion band for direct acting | Active input: 0.05.7300 |
TN-h | Integral action time for heating | 0.4096 sec |
TN-c | Integral action time for cooling | 0.4096 sec |
TN-r | Integral action time for reverse acting | 0.4096 sec |
TN-d | Integral action time for direct acting | 0.4096 sec |
T | Time elapsed to allow next winter/summer changeover (Q1 only) | 0.4096 sec |
Compensation shift (Start point, End point & Shift differential) | - | |
MAX | Maximum Limiter | -80.8000 |
MIN | Minimum Limiter | -100.7980 |
WIN | Winter changeover point | -100.8000 |
SUM | Summer changeover point | -100.8000 |
🔵 PS4 - Main Control Loop Setup:
Name | Description | Display, Setting Range |
T1 | Minimum switch off time for Q1 | 0.255 sec |
T2 | Minimum switch off time for Q2 | 0.255 sec |
TCYC | Cycle time of the actuator | 1.255 sec |
ON | Dependent loop. On point of Q1 as a % of total (Q1+Q2) SD | 0.100 % |
TN3P | I time for 3-point actuator | 0.4096 sec |
XP3P | P band 3-point actuator | 0.05.7300 (Depends on the X1 setting range) |
SD | Switching Differential | 0.05.7300 |
⚠️Note:
Time-out:
- For set-point adjustment in Normal mode, the controller will exit the setting after 20 seconds automatically.
- However, for set-point adjustment in Service (PS) mode, there is no time limit.
- The controller remains on the PS mode until the user completes the whole process.
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| Connection Diagram |
✅ DISPLAY NAME & SYMBOL
➤ #10 - Application Number,
- 10 to 59 (Not consecutive numbers)
➤ ☼ - Day time operation,
➤ ☽ - Night time operation
➤ X1 - Universal (Main) Input X1,
- Ni 1000Ω: -50 150°C (unchangeable),
- Pt 1000Ω: -20 180°C (unchangeable),
- 0-10 Vdc: -100 8000,
➤ X2 - Universal (Auxiliary) Input X2,
- Ni 1000Ω: -50 150°C (unchangeable)
- Pt 1000Ω: -20 180°C (unchangeable)
- 0-10 Vdc: -100 8000
- Variable resistor: the resistance range should within 0 1000 Ω,
➤ ---- No unit (e.g. pressure, air quality and air volume flow),
➤ Sec - Second,
➤ Y1 - Analogue output 1
➤ Y2 - Analogue output 2
➤ °C - Celsius scale
➤ °F - Fahrenheit scale
➤ K - Kelvin
➤ % - Percentage scale (e.g. RH)
➤ TOOL PC - communication port being used
➤ OUT RANGE - The setting is out of range,
➤ Err - Sensors error,
➤ #10★ - ★Using not the defaulted sensor
➤ WIN/SUM - Winter/Summer mode being chosen or activated
➤ LIM - Limiter mode being chosen or activated
➤ REM - Remote setpoint mode being chosen or activated
➤ CAS - Cascade mode being chosen or activated
➤ MaxPrior - Maximum priority mode being chosen or activated
➤ SP-h - Setpoint on the heating side for temperature control
➤ SP-c - Setpoint on the cooling side for temperature control
➤ SP-r - Setpoint on the reverse acting side for active input (0 10 Vdc)
➤ SP-d - Setpoint on the direct acting side for active input (0 10 Vdc)
➤ XDZ - For R+D application. Dead zone between R and D day setpoints when in REM mode,
- Ni: 0.5 180 K
- Pt: 0.5 180 K
- Active input: 0.05 7300
🏁Conclusion:
- The Siemens RWD82 and RWD32 universal controllers are robust, programmable solutions for a wide range of HVAC control applications.
- Their ease of configuration, reliable performance, and adaptability make them essential tools for smart building automation.
- Understanding how to properly configure control parameters ensures optimal functionality, reduced energy consumption, and long-term reliability.
- Keep following for more in-depth guides on HVAC controllers and automation systems!
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