Ingersoll-Rand CENTAC Technical Reference Manual

Name: Ingersoll-Rand CENTAC
Brand: Ingersoll-Rand
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177 pages

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CENTAC

CMC Technical Reference Manual

INGERSOLL-RAND

AIR COMPRESSORS

Default Chapter3
- Table of Contents3
What's New in this Manual11
References12
General - CMC Panel13
Control Methodology14
- Performance Control14
- Surge Control20
Oil System Control24
- Prelube Pump24
- Oil Heater24
Protection and Monitoring25
- Analog Functions25
  - Analog Inputs25
  - Analog Outputs25
- Digital Functions25
  - Digital Inputs25
  - Digital Outputs26
Compressor Operating Methodology27
- Stopped27
- Rotating27
- Compressor Operating States29
  - Ingersoll-Rand Company Date of Issue: 18-Oct29
User Interface30
- OUI (Operator User Interface)30
- General Sequence of Operation44
- Indicator, Switch and Light Layout45
CMC Tuning Procedures45
- Figure 11: Plant Air System45
- Setting Maxload46
- Setting Minload46
- Setting Minload Surge Index Increment47
- Setting Surge Sensitivity47
- Tuning Stability48
- Calibrating the Control Valves49
- Autodual Control Settings50
- Setting the Start Time52
- Setting the CT Ratio52
- Inlet Unload Position52
- Setting Set Point Ramp Rate53
  - Figure 12: Troubleshooting Tree54
- Alarm and Trip Settings53
Troubleshooting54
1000 CMC Technical Reference Manual55
- Ingersoll-Rand Company Date of Issue: 18-Oct55
- Troubleshooting Example55
- Input/Output (I/O) System56
- Control Power System (CPS)76
- Controller Problems80
Options82
- Enclosures82
- Control Electrical Package84
- Stage Data Package84
- Alarm Horn84
- Running Unloaded Shutdown Timer84
- Water Solenoid Post Run Timer84
- Panel Mounted Wye-Delta Starter84
- Contact for Remote Indication of Common Alarm and Trip84
- Power Regulating Constant Voltage Transformer84
  - Ingersoll-Rand Company Date of Issue: 18-Oct84
- Automatic Starting85
- Remote 4-20 Ma Pressure Setpoint86
- Steam and Gas Turbine Driven Compressors86
- Diesel Driven Compressors93
Communication94
- Centac Energy Master (CEM)94
- Direct CMC Communications with RS422/48594
- The CMC-MODBUS Interface95
1000 CMC Technical Reference Manual96
- MODBUS Messages96
- Function Details97
- Exception Responses115
- Maximum Query / Response Parameters117
- CMC Data118
- Scaling and Units of Measure118
- Communication Parameters118
- The CMC-DF1 Interface119
Documentation150
System Information150
- Status Codes150
- Base Control Module (BCM)153
1000 CMC Technical Reference Manual156
- Operator User Interface Module (OUI)156
- Universal Communication Module (UCM) Optional160
Technical Specification167
Glossary169
- Ingersoll-Rand Company Date of Issue: 18-Oct170
Service Tool Variable Names175

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Questions and Answers:

T
taylorbellJul 26, 2025
What to do if the Ingersoll-Rand Control Systems shows a low oil pressure trip?
- C
  Carl JonesJul 26, 2025
  If the Ingersoll-Rand Control Systems indicates a low oil pressure trip, it could be due to the oil pressure falling below the Oil Pressure Trip Value or an incorrect value read by the CMC. First, check the prelube pump and installation of a calibrated pressure sensor to verify the actual oil pressure. If the oil pressure is adequate, refer to the Pressure Monitoring System troubleshooting table, as the likely cause is a loose wire, terminal, or connector.