VMCsi - Coolant Through Spindle (CTS)

• M48 = CTS ON
• M49 = CTS OFF

G-code only recognizes M-codes for coolant control. Tool List selections are not used in ISO programs.

In ShopMill, the control automatically follows the CTS column setting from the Tool List.

Found by going to [Diagnostics] → [Trak Diagnostics]

I32.5 — CTS Pump Overloaded

• TRUE indicates that the overload has tripped.

I34.3 — CTS Pressure Sensor

• TRUE indicates that coolant pressure has reached the set value; FALSE means pressure is low or not detected.

I37.7 — CTS Filter

• If the filter is not clogged, I37.7 stays TRUE regardless of whether CTS is on or off.

Q40.2 — CTS Pump ON

• TRUE means the control is commanding the CTS pump to run; FALSE means the pump is off.

510120 – CTS Pressure Low, Spindle at Commanded Speed

What it means: The spindle has reached the commanded speed (e.g., 4000 RPM), but CTS pressure has not reached the sensor’s set value (I34.3 = 0).

Why it triggers: The machine disables feed and read-in to prevent cutting before coolant pressure builds.

How it clears: This is an operator message. It clears automatically when I34.3 goes high (CTS pressure is established).

510222 – CTS ON, Set Pressure Not Reached

What it means: CTS was commanded on, but the pressure input (I34.3) stayed low. Spindle speed is not considered.

Why it triggers: Program execution is stopped because CTS pressure was not confirmed.

How it clears: This is also an operator message. It clears automatically once I34.3 goes high.

Simple Check:

If the motor is running and coolant is flowing → adjust the pressure sensor (I34.3).

If errors appear and no coolant is coming out → check pump power, overload (Q21 / I32.5), filter (I37.7), or coolant level.

34082 - TRANSFORMER OPTION-VMC7/10SI-208V TO 480V

Q21 overload relay is set to 7 amps for the CTS pump motor.

If the machine has the 208V→480V transformer option, a soft starter (P/N 34154) is installed for CTS.

The soft starter replaces K21 (contactor) and Q21 (overload).

Q40.2 drives the soft starter input.

The overload signal (I32.5) returns from the soft starter to the PLC.

31219 - FILTER ELEMENT-CTS-25MICRON

If you disconnect the 24 V and ground wires from the CTS clog sensor and touch them together, the 700933 – CTS Clog error should clear.

• Sensor type: Normally Closed (NC)
• Closes when: Filter is not clogged (normal condition)
• Opens when: Filter is clogged (triggers 700933 error)

1. Calibration is set at the factory; only adjust if needed.
2. Power on the mill, remove any tool, and enable CTS.
3. Locate the Calibration screw.
4. Tighten slowly (about 1/8 turn per second) while watching the pendant.
5. When a CTS fault appears, loosen the screw ¼ turn.
6. Clear the fault on the pendant.