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Trane Tracer MP501 Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance
Tracer® MP501 Controller
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.
April 2020
SAFETY WARNING
CNT-SVX08F-EN

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Summary of Contents for Trane Tracer MP501

  • Page 1 Installation, Operation, and Maintenance Tracer® MP501 Controller SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
  • Page 2 Copyright This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.

  • Page 3: Table Of Contents

    Table of Contents Overview ............6 Product Description .
  • Page 4 Table of Contents Timed Override Control ......... 20 Output Types .
  • Page 5 Table of Contents Reverse Action ..........38 Determining the Action .

  • Page 6: Overview

    Overview This guide provides installation and configuration information for the Tracer MP501 controller, as well as a description of its operations. The overview includes a product description, specifications, and descriptions of additional components needed in some MP501 applications. Product Description The MP501 is a configurable, multi-purpose controller used to provide direct-digital control for heating, ventilation, and air conditioning (HVAC) equipment.

  • Page 7: Clearances

    Overview Clearances For wiring, ventilation, and maintenance, provide the following minimum clearances for the controller: Plastic Cover Model • Front: 4.0 in. (102 mm) • Each side: 1.0 in. (25 mm) • Top and bottom: 4.0 in. (102 mm) Metal Cover Model •...

  • Page 8: Agency Listing/Compliance

    Overview Figure 2. Metal cover model dimensions and clearances 1 in. (25 mm) 1.875 (48 mm) 6.5 in. (165 mm) 9 in. 9 in. (229 mm) 7 in. (229 mm) (178 mm) 2 in. 2 in. (51 mm) (51 mm) 24 in....

  • Page 9: Zone Temperature Sensors (Scc Mode)

    Overview Zone Temperature Sensors (SCC Mode) Table 1 shows the Trane zone temperature sensors that are supported by the MP501 in SCC mode. Table 1. Tracer zone temperature sensor options Timed Override Zone Buttons BAS Order Comm Jack Number Setpoint...

  • Page 10: General Wiring Information

    General Wiring Information This section provides specifications and general information about wiring the MP501. The controller requires wiring for: • Input/output terminal wiring • AC power wiring • Communication link wiring and addressing Input/Output Terminal Wiring All input/output terminal wiring for the MP501 must meet the following requirements: •...

  • Page 11: Communication Link Wiring And Addressing

    General Wiring Information The ac power connections are in the top left corner of the MP501 as shown in Figure Figure 3. Connecting ac power wires to the controller 24 Vac transformer GND 24V AC POWER Use a UL-listed Class 2 power transformer supplying a nominal 24 Vac (21–27 Vac). The transformer must be sized to provide adequate power to the MP501 (10 VA) and output devices, including relays and actuators (a maximum of 60 VA for outputs).

  • Page 12: Location Recommendations

    Leave the cover on when mounting the MP501 to avoid the possibility of damaging the circuit board during installation. Trane recommends the following mounting guidelines: Mount the controller in any direction, other than with the front of the cover facing downward.

  • Page 13: Applications For Scc Mode

    The SET analog input functions as the local (hardwired) temperature setpoint input for applications utilizing a Trane zone sensor with a temperature setpoint thumbwheel. The ability to enable or disable the local setpoint input is available in the Rover service tool. A communicated setpoint...

  • Page 14: Zn: Zone Temperature

    The ZN analog input functions as the local (hardwired) zone temperature input. The controller receives the temperature as a resistance signal from a 10 kW thermistor in a standard Trane zone sensor wired to the analog input labeled ZN. A communicated zone temperature value can also be used for controllers operating on a BAS.

  • Page 15: Ao: Analog Output

    Applications for SCC Mode AO: Analog Output The analog output on the MP501 is a 0–10 Vdc output with a maximum current draw of 10 mA from the connected device. Figure 7, p. 17 shows a wiring diagram with the MP501 in this configuration. Note: The MP501 will control only one actuator.
  • Page 16 Not used Fan on/off 24 Vac Not used GND 24V OUT GND STATUS AC POWER BINARY OUTPUTS COMM5 ZONE SENSOR SERVICE COMM5 Not used LonTalk  Trane zone communication temperature sensor link Optional LonTalk connection Occupancy or generic input CNT-SVX08F-EN...
  • Page 17 GND 24V OUT GND STATUS AC POWER BINARY OUTPUTS COMM5 ZONE SENSOR SERVICE COMM5 Not used LonTalk  Trane zone communication temperature link sensor Optional LonTalk connection Occupancy or generic input Figure 7. Input/output terminal wiring for SCC applications with the MP501 controlling an analog (0–10 Vdc) actuator...
  • Page 18 Analog output (0–10 Vdc) 24 Vac Not used GND 24V OUT GND STATUS AC POWER BINARY OUTPUTS COMM5 ZONE SENSOR SERVICE COMM5 Not used LonTalk  Trane zone communication temperature link sensor Optional LonTalk connection Occupancy or generic input CNT-SVX08F-EN...

  • Page 19: Sequence Of Operations/Scc Mode

    Occupancy modes can be controlled by any of the following: • The state of the local (hardwired) occupancy binary input BI1 • A timed override request from a Trane zone sensor (refer to the section, “Timed Override Control,” p. •...

  • Page 20: Occupied Mode

    The controller is placed in occupied bypass mode if the controller is operating in the unoccupied mode and either the timed override on button on the Trane zone sensor is pressed or the controller receives a communicated occupied bypass signal from a BAS. In occupied bypass mode, the controller maintains the zone temperature based on the occupied heating or cooling setpoints.

  • Page 21: Output Types

    Sequence of Operations/SCC Mode will be placed in occupied bypass mode and remain in that mode until either the cancel button is pressed on the Trane zone sensor or the occupied bypass time expires. Output Types The MP501 can be configured to control its actuator output in any one of three modes: •...

  • Page 22: Fan Operation

    Sequence of Operations/SCC Mode Figure 8. Make-and-break limits in 2-stage mode Active Stage 2 Inactive Active Stage 1 Inactive Make Make Limit 1 Limit 2 Break Break Limit 1 Limit 2 Actuator Command (Percent) Fan Operation The fan is configurable for continuous or cycling operation for both heating and cooling mode. If configured for continuous operation, the fan runs continuously during the occupied, occupied standby, and occupied bypass modes.

  • Page 23: Applications For Generic Mode

    (for example, 4–20 mA is 0–100%) is configured with the device plug-in of a software service tool (such as the Rover service tool). Note: Trane 10 kW thermistor temperature sensors are not compatible with this input. SET: Local Setpoint This input is not used if the controller is operating in generic mode. Neither the MP501 nor a BAS system can use this input if the MP501 is configured as generic.

  • Page 24: Zn: Zone Temperature

    ZN: Zone Temperature This input is not used if the controller is operating in generic mode. Neither the MP501 nor a BAS system can use this input if the MP501 is configured as generic. Outputs for Generic Applications The MP501 includes four (4) outputs. Table 5 lists the outputs and their functions in generic mode.
  • Page 25 Applications for Generic Mode Figure 9. Input/output wiring for generic applications with the MP501 controlling a tri-state modulating actuator Tri-state modulating actuator Interlock device on/off Not used 24 Vac Not used GND 24V OUT GND STATUS AC POWER BINARY OUTPUTS COMM5 ZONE SENSOR SERVICE...
  • Page 26 Stage 1 Interlock device on/off 24 Vac Not used GND 24V OUT GND STATUS AC POWER BINARY OUTPUTS COMM5 ZONE SENSOR SERVICE COMM5 Not used LonTalk  24 Vac communication Trane CO link sensor Not used Enable/disable or generic input CNT-SVX08F-EN...
  • Page 27 Applications for Generic Mode Figure 11. Input/output wiring for generic applications with the MP501 controlling an analog (0–10 Vdc) actuator Interlock  device on/off Analog output (0–10 Vdc) 24 Vac Not used GND 24V OUT GND STATUS AC POWER BINARY OUTPUTS COMM5 ZONE SENSOR SERVICE...

  • Page 28: Sequence Of Operations For Generic Mode

    Sequence of Operations for Generic Mode Sequence of Operations for Generic Mode Configuring the MP501 in generic mode will control a variety of applications. The MP501 controls a process based on an input that is one of the following: • Temperature •...

  • Page 29: Relay Output Control

    Relay Output Control Binary output 3 (relay output) energizes whenever the PID loop is enabled (refer to the previous section, “Loop Enable/Disable,” p. 28). It is de-energized whenever the PID loop is disabled. Output Types The controller is configurable to control the other outputs in one of three ways: •...

  • Page 30: What Are Pid Loops

    PID Control • What are PID loops? • PID calculations • Throttling range and gain • Calculating gain • Sampling frequency • Calculaing sampling frequency • PID loop action • Error deadband • Other PID settings • Troubleshooting procedure • Tips for specific problems For more details about PID loops, refer to the PID Control in Tracer Multi-Purpose Controllers Applications Guide, (BAS-APG002).

  • Page 31: Pid Calculations

    PID algorithm than either the integral or derivative calculations. It determines the responsiveness (or aggressiveness) of a control system. Though some systems use only proportional control, most Trane controllers use a combination of proportional and integral control.

  • Page 32: Derivative Calculation

    4:1 for the proportional and integral gains. Therefore, the proportional gain should be four times as large as the integral gain. It may be necessary to modify...
  • Page 33 PID Control Table 7. Starting gain values for applications Throttling Proportional Integral Loop Output Range Gain Gain Inlet guide vane or variable frequency 2.0 in. wc.  Duct static pressure drive (VFD) position  40.0 (160) 10.0 (40.0) (0.5 kPa) 0–100% Electric/pneumatic ...

  • Page 34: Sampling Frequency

    PID Control Sampling Frequency The sampling frequency is the rate at which the input signal is sampled and PID calculations are performed. Using the right sampling frequency is vital to achieving a responsive and stable system. Problems can arise if the sampling frequency is too slow or too fast in comparison to time lags in the system.

  • Page 35: Calculating The Sampling Frequency

    PID Control of the situation, which can destabilize the system. The control system should always wait to process the result of a change before making another change. Figure 17 shows the process variable if sampling times are too fast, acceptable, and barely acceptable.
  • Page 36 PID Control 20. Record the measured value when it stabilizes. The temperature stabilizes at 70°F (21°C). 21. Manually control the analog output to 50% or 100%. Control the output to 100% (completely opening the heating valve). 22. Record the measured value when it stabilizes. The temperature stabilizes at 120°F (49°C) 23.

  • Page 37: Pid Loop Action

    PID Control 30. Fully open the output. 31. The stabilized temperature reads 105°F (41°C). 32. The change in temperature is 105°F - 60°F = 45°F (41 - 16 = 25°C). 33. Two-thirds of the change in measured value is 0.66 × 45°F = 30°F, so two-thirds of the total change has occurred when the temperature is 60°F + 30°F = 90°F (0.66 ×...

  • Page 38: Reverse Action

    PID Control Reverse Action A controller using reverse action decreases the output when the process variable increases. Figure 20 shows the temperature when a system is heating a space. If the error is large and the PID output is at 100%, the actuator and valve combination are fully open. If the process variable (room temperature) increases, reducing the error, the controller closes the valve to reduce heating.

  • Page 39: Error Deadband

    PID Control Example 2 A supply fan controls the static pressure in ductwork supplying variable-air-volume (VAV) boxes. The supply fan operates at its highest speed if the PID output is at 100% (when the pressure is too low). If the pressure goes above the setpoint, the supply fan should slow down to blow less air to the VAV boxes.

  • Page 40: Adjusting Error Deadband For Staged Outputs

    PID Control is 0.5°F (0.3°C). This setting ensures that the sensor reading has changed an adequate amount before the controller responds. Important: The error deadband should not be smaller than the sensor resolution or the controller will react to noise. Adjusting Error Deadband for Staged Outputs This section describes how to adjust the error deadband for staging applications.

  • Page 41: Other Pid Settings

    PID Control Other PID Settings Use the following settings to manage PID loops: • Proportional bias, which takes the place of derivative gain in proportional-only control • Minimum and maximum output, which limit the range of output of the PID algorithm •...
  • Page 42 PID Control Changing the Sampling Frequency The major cause of actuator cycling is time lags in the system. Note: If a 10% change in PID output requires two minutes to affect the process variable, it does no good to have the sampling frequency set to two seconds. The integral contribution will build up before any significant change in error can be measured.

  • Page 43: Status Indicators For Operation And Communication

    Status Indicators for Operation and Communication Status Indicators for Operation and Communication This section provides information about the operation and communication status indicators on the MP501, including: • A description of the location and function of the Test button, the Service Pin button and the light-emitting diodes (LEDs) located on the controller •...

  • Page 44: Service Pin Button

    48. Press the Test button (no more than once per second) to advance through the test sequence. Table 12 shows the resulting activities of the outputs. Table 12. Manual output test sequence Step (Number of Times Test Button Binary Binary Binary is Pressed in Sequence) Output 1...

  • Page 45: Yellow Lontalk Led

    Status Indicators for Operation and Communication Table 14. Green Status LED LED Activity Explanation LED blinks (1/4 second on, 1/4 The auto-wink option is activated, and the controller is communicating. second off for 10 seconds). Either the power is off, the controller has malfunctioned, or the Test button LED is off continuously.

  • Page 46: Diagnostics

    Status Indicators for Operation and Communication Diagnostics In response to a diagnostic, the MP501 attempts to protect the equipment it is controlling by disabling all the outputs. When the diagnostic clears, the controller resumes normal operation. Table 16 lists the diagnostics for the MP501. All diagnostics generated by the MP501 are automatic (non-latching) diagnostics.

  • Page 47: Troubleshooting

    Troubleshooting Troubleshooting This section outlines some general troubleshooting steps that should be performed if there is a problem with the operation of the equipment controlled by the MP501. If encountering operational problems with the MP501, first, perform initial troubleshooting steps described in the next section, “Initial Troubleshooting”.

  • Page 48: Binary Output 3 (Relay Output) Troubleshooting

    Binary Output 3 (Relay Output) Troubleshooting If binary output 3 (relay output) is not turning on the equipment wired to it, then follow the troubleshooting steps in Table 18. Perform the steps in the order they are listed. The troubleshooting steps assume the equipment connected to binary output 3 is off when the user believes it should be on and vice versa.
  • Page 49 Troubleshooting The analog output generates a 0–10 Vdc control signal used to control valve, damper, pump speed, fan speed, and so on. The PID loop in the MP501 calculates a value between 0 and 100%. The controller then translates that percentage into the output voltage. Table 20 lists the scaling for typical analog output applications.
  • Page 50 Troubleshooting Table 22. Analog output (0–10 Vdc) troubleshooting of configuration and operation Probable Cause of Step Number Action Problem Connect the Rover service tool to the LonTalk communication link, start the Rover service tool, and select the MP501 you are troubleshooting from the Active Group Tree. The device plug-in Step 1 for the selected MP501 will appear with the Status screen displayed in the workspace.

  • Page 51: Binary Output 1 And 2 Troubleshooting

    Troubleshooting Binary Output 1 and 2 Troubleshooting Binary outputs 1 and 2 are TRIAC outputs. They can be used as two separate outputs (staged) or can control a tri-state modulating actuator. If binary outputs 1 and 2 are always off, then begin with the troubleshooting steps in Table 23.

  • Page 52: Occupancy Arbitration (Only Scc Mode)

    Occupancy; Manual Command Some communicating devices may request occupancy based on the information communicated in the network variable known as nvoOccManCmd. Trane systems and zone sensors do not communicate this information to the controller, but the controller accepts this network variable as a communicated input nviOccManCmd.

  • Page 53: Occupancy; Schedule

    In such devices, network variable input nviOccSensor is used to communicate occupancy to the controller. Trane systems and zone sensors do not currently send this variable. The hardwired occupancy input of this controller is handled as if it is a communicated occupancy sensor input.

  • Page 54: Occupancy Binary Input

    Troubleshooting Occupancy Binary Input The binary input on the controller is used as an occupancy input if configured as SCC. For stand- alone controllers (any unit not receiving a communicated occupancy request, typically from a building automation system), the occupancy binary input determines the occupancy of the unit based on the hardwired signal.
  • Page 55 Troubleshooting Table 28. Effective occupancy output Occupancy Sensor nviOccManCmd nviOccSchedule Arbitration Result Bypass Timer nvoEffectOccup Occupied Does not matter Does not matter Does not matter Occupied Zero Unoccupied Does not matter Unoccupied Does not matter Not zero Bypass Occupied Does not matter Does not matter Occupied Zero...

  • Page 56: Index

    Index error deadband 39 Numerics integral calculation 31 2-stage Make and break limits other PID settings 41 Make and break limits (generic 2-stage mode (generic PID calculations 31 mode) 29 mode) 29 PID loop action 37 Make and break limits (SCC 2-stage mode (SCC mode) 22 mode) 22 proportional calculation 31...
  • Page 57 Index Wiring diagrams Analog (0–10 Vdc) actuator (generic mode) 27 Analog (0–10 Vdc) actuator (SCC mode) 17 Staged outputs (generic mode) 26 Staged outputs (SCC mode) 17 Tri-state modulating actuator (generic mode) 25 Tri-state modulating actuator (SCC mode) 16 Zone Temperature Control 19 Zone Temperature sensors 9 CNT-SVX08F-EN...
  • Page 60 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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