Danfoss TTS400

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®

Service Manual - Revision H



Danfoss Turbocor® Twin-Turbine

Centrifugal Series Compressors



TT Series Compressors

http://turbocor.danfoss.com |

Table of Contents

Other manuals for Danfoss TTS400

Applications And Installation Manual114 pages

Questions and Answers:

B
Benjamin WardAug 15, 2025
What to do if there is a High Discharge Temperature Fault in my Danfoss TTS400?
- S
  Sarah MathewsAug 16, 2025
  A high discharge temperature fault in the Danfoss Air Compressor often suggests insufficient charge (low gas), increased condenser temperature, a check valve that hasn't opened, or the compressor running in surge condition for too long. To address this, check the chiller gas charge, the conditions of the air/water entering the condenser, and the operational settings. Also, make sure the discharge pressure/temperature sensor is working correctly and that the check valve opens during compressor operation.
R
rjacksonAug 18, 2025
What to do if there is a Low Suction Pressure Fault in my Danfoss Air Compressor?
- J
  jennifer22Aug 19, 2025
  A Low Suction Pressure Fault in your Danfoss Air Compressor suggests there may be insufficient charge, insufficient system load, or a sudden drop in evaporator entering air/water temperature or flow. You should check the charge, system load, and entering air/water conditions to resolve this issue.
C
Christina WilsonAug 21, 2025
What to do if I see a High Inverter Temperature Fault on my Danfoss TTS400?
- H
  Heather OsborneAug 21, 2025
  A High Inverter Temperature Fault in your Danfoss Air Compressor indicates that the inverter cooling is not sufficient. Ensure that the liquid motor-cooling line has enough liquid supply and is not blocked. To prevent Inverter failure, avoid running the compressor for long periods at a pressure ratio less than 1.5. If the fault occurs three times in 30 minutes, a Lock-Out Fault will occur. In this case, allow the measured Inverter temperature to drop below the Maximum Drive Startup Temperature before attempting a restart.
K
Kevin MooreAug 25, 2025
What causes a High Discharge Pressure Fault in a Danfoss Air Compressor?
- R
  ronald58Aug 25, 2025
  A High Discharge Pressure Fault in your Danfoss Air Compressor suggests that the condenser may be faulty or there's insufficient air/water flow. You should check the condenser and air/water flow. Also review the fault log for the actual discharge pressure and other conditions recorded at the time of the fault.
M
Michael GonzalezAug 28, 2025
What causes a 3-Phase Over-Current Fault in a Danfoss Air Compressor?
- H
  Haley StephensonAug 28, 2025
  A 3-Phase Over-Current Fault in your Danfoss Air Compressor means the compressor is drawing more current than the 3-Phase Current Fault Limit. Review the fault log for the recorded 3-Phase Current level, demand, entering air/water temperature (if available), and other conditions recorded at the time of the fault. This fault can also be related to a start speed or minimum pressure ratio that is set too high at start-up, a power control integral gain that is too high, or a sudden increase in load/demand or system changes.
C
courtney14Aug 30, 2025
What causes a High Cavity Temperature Fault in my Danfoss Air Compressor?
- D
  david75Aug 30, 2025
  A High Cavity Temperature Fault in your Danfoss Air Compressor indicates that the motor cooling is insufficient. Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked. To prevent shaft demagnetization or Back EMF is low faults, avoid running the compressor for long periods at a pressure ratio less than 1.5.
C
cdavisSep 3, 2025
What causes a High Pressure Ratio Fault in my Danfoss Air Compressor?
- J
  Jamie WiseSep 3, 2025
  A High Pressure Ratio Fault in your Danfoss Air Compressor suggests the condenser pressure is high, there is not enough load on the evaporator, or there is insufficient water/air flow in either the condenser or evaporator. Check the electronic expansion valve (EXV) operation, condenser and evaporator loads, and water/air flow.
A
Andrew VasquezSep 6, 2025
What does a Low Leaving Fluid Temperature Fault mean on my Danfoss TTS400 Air Compressor?
- D
  David EdwardsSep 6, 2025
  A Low Leaving Fluid Temperature Fault in your Danfoss Air Compressor suggests there is insufficient evaporator fluid flow or insufficient system load. Check the evaporator fluid flow and system load. Also, verify the leaving fluid temperature sensor.
A
Andrew JoyceSep 8, 2025
What causes a High SCR Temperature Fault in my Danfoss TTS400?
- H
  henryethanSep 8, 2025
  A High SCR Temperature Fault in your Danfoss Air Compressor indicates that the SCR cooling is insufficient. Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
P
Peter HoSep 12, 2025
What does a Sensor Fault mean on my Danfoss TTS400 Air Compressor?
- W
  Willie MeltonSep 12, 2025
  A Sensor Fault in your Danfoss Air Compressor may be caused by values out of the specified ranges. Review the fault log for any such indications recorded at the time of the fault. Verify the questionable sensor and related connections to check for failure. Also, verify the suction pressure/temperature sensor.

Danfoss TTS400 Specifications

General

Brand	Danfoss
Model	TTS400
Category	Air Compressor
Language	English

Summary

Chapter 1.0 Introduction

1.5 Safety Summary

Alerts service personnel to safety precautions for installation, start-up, and service.

Chapter 3.0 Compressor Removal and Installation

3.1 Refrigerant Containment

Procedures for isolating and recovering refrigerant before compressor removal.

3.2 Compressor Removal

Steps for safely isolating power and disconnecting components for compressor removal.

3.3 Compressor Installation

Detailed steps for installing a new compressor, including torque specifications.

Chapter 4.0 Component Identification

4.14 Soft Start

4.21 DC Capacitor Bus Bar Assembly

4.22 Inverter

4.29 Magnetic Bearings

Chapter 5.0 Troubleshooting

5.1 Alarm and Fault Indications

Guides on gathering facts and reviewing logs for efficient troubleshooting.

5.2 Troubleshooting with the Service Monitoring Tools Software

5.3 Bearing Calibration

Provides procedures for performing and analyzing bearing calibration.

5.5 System and Compressor Level Troubleshooting

Covers troubleshooting voltage issues and identifying energy drains within components.

Appendix B Compressor Troubleshooting Flowcharts

Figure B-1 Compressor Operation Troubleshooting Flowchart (Sheet 1)

Flowchart for troubleshooting compressor operation issues.

Figure B-2 Compressor Operation Troubleshooting Flowchart (Sheet 2)

Continuation of compressor operation troubleshooting flowchart.

Figure B-3 Compressor Voltage Troubleshooting Flowchart (Sheet 1)

Flowchart for troubleshooting compressor voltage issues.

Figure B-4 Compressor Voltage Troubleshooting Flowchart (Sheet 2)

Continuation of compressor voltage troubleshooting flowchart.

Figure B-5 Compressor Voltage Troubleshooting Flowchart (Sheet 3)

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