CP Central Controller (up to 6)

Multi-compressor plant master. Not a compressor controller — pairs with each machine's local panel. Best-fit for all-CP shops; mixed-brand plants often benefit from a vendor-neutral sequencer instead.

Manufacturer

Chicago Pneumatic

Display

5-inch color TFT touch.

Years produced

~2015 – present.

Power supply

24 VDC, 100–240 VAC input.

Ambient range

0 – 46 °C.

Protection rating

IP54 front.

Relay outputs

Per-machine run/stop dry contacts, common alarm, standby request.

Used on

Networks of CP QRS / CP screws
Mixed-brand plants using dry-contact enable

Features

Sequencing up to 6 compressors
Equal run-hours balancing
Cascade or narrow-band control
Trend & event export via USB

Interfaces

Ethernet Modbus TCP
RS-485 Modbus RTU
Digital I/O for legacy machines
USB service port

Sensor inputs

Common header pressure (4–20 mA)
Ambient temp (option)
Dewpoint from downstream dryer (Modbus)

Common fault codes

Comm Loss – Unit n Master lost Modbus / dry-contact feedback from machine n.

First checks

Check cable & termination to that unit
Verify slave node address
Cycle power to the affected unit

See trigger conditions & affected models →

Pressure Sensor Fault Header pressure sensor open / out-of-range.

First checks

Verify 24 VDC loop
Test sensor at known pressure
Check for water in the impulse line

See trigger conditions & affected models →

System Pressure Low Header pressure < low-limit for > delay time.

First checks

Verify all machines in Auto
Check for large leak or open service valve
Review event log for cascading trips

See trigger conditions & affected models →

System Pressure High Header pressure > high-limit — inlet valves stuck open?

First checks

Verify unload setpoints on each unit
Check for a compressor stuck in load

See trigger conditions & affected models →

Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.

Wiring notes

Modbus RTU to CP units carrying an ES4000 or newer controller — 120 Ω termination at each end
Legacy IR / Sullair / GD machines wire in via dry-contact enable + run-feedback pairs
Header pressure sensor MUST be at the plant discharge, not on a branch

Known issues & field notes

USB export truncates files > 32 MB — export more often on high-event sites
Firmware < 1.20 mis-reports run hours after DST changes — update recommended

Manuals & literature

Chicago Pneumatic — manuals index

Parts & Services portal

Direct PDFs

Browse all OEM manual portals →

Your manuals