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 whether CTS is on or off.
• Alarm 700933 is only generated when the CTS pump is running and I37.7 is FALSE.

Q40.2 - CTS Pump ON

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

Use this to confirm the CTS system is working before deeper troubleshooting.

1. Remove any tool from the spindle.
2. Open [Diagnostics] → [Trak Diagnostics].
3. Turn CTS on with M48 in MDA.
4. Verify Q40.2 = TRUE.
5. Verify the CTS pump is running and coolant exits the spindle nose.
6. Verify I32.5 = FALSE (overload not tripped).
7. Verify I34.3 = TRUE (pressure reached).
8. Verify I37.7 = TRUE (filter not clogged).
9. Verify no 510120, 510222, 700019, or 700933 alarms are active.
10. Turn CTS off with M49.

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.

700019 - Coolant Through Spindle Motor Overload

What it means: The CTS pump motor overload has tripped (I32.5 = 1).

Why it triggers: The machine goes into feed hold, NC start disable, and spindle feed hold to protect the pump motor.

How it clears: Find and remove the cause of the overload. Check that the CTS pump motor is wired for the correct rotation. Reset overload Q21 in the electrical cabinet, then press RESET. Do not raise the Q21 setting to stop a trip.

700933 - CTS Pump Clogged, Check CTS Filter

What it means: The CTS pump is running, but the filter clog sensor input (I37.7) is FALSE.

Likely causes:

• Dirty or clogged filter element (31219)
• Failed clog sensor (31567)
• Loose or damaged clog sensor wiring

How it clears: Clean or replace the filter element and verify I37.7 returns to TRUE. See the Clog Sensor section below to test the sensor.

Pump is not running (Q40.2 = TRUE, no coolant):

1. Check I32.5. If TRUE, the overload is tripped. See alarm 700019.
2. Check Q21 (or the soft starter on transformer machines).
3. Check pump power and wiring.

Pump is running but pressure alarms appear (510120 / 510222):

1. Check the CTS coolant level. Insufficient coolant can cause false CTS pressure faults.
2. Check I37.7 and the filter element. A clogged filter can starve pressure at the sensor.
3. Verify the fine filter screen is installed in the correct direction. A backwards screen has been seen on early machines.
4. Do not run washdown and CTS at the same time. Running both can drop CTS pressure.
5. If the pump is running, coolant flows freely from the spindle, and I34.3 stays FALSE, adjust the pressure sensor. See Pressure Sensor Calibration below.

Standard Machines

• Q21 overload relay is set to 7 amps for the CTS pump motor.
• K21 contactor switches the CTS pump motor.
• Q40.2 drives K21.
• I32.5 is the Q21 overload signal back to the PLC.

208V Transformer Option (VMC7/10si only)

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

• 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.

31567 - SENSOR-MAGNETIC-FILTER CLOG-CTS

31219 - FILTER ELEMENT-CTS-25MICRON

• Sensor type: Normally Closed (NC)
• Closed when: Filter is not clogged (normal condition, I37.7 = TRUE)
• Open when: Filter is clogged (I37.7 = FALSE, triggers 700933)

Sensor Test: Disconnect the 24 V and ground wires from the CTS clog sensor and touch them together. If 700933 clears, the wiring and input are good and the problem is the filter or the sensor.

31599 - SENSOR-PRESSURE-COOLANT-CTS

Insufficient coolant can cause false CTS pressure sensor faults. Check the coolant level before adjusting.

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 1/2 turn.
6. Clear the fault on the pendant.
7. Run the Quick CTS Test to confirm I34.3 = TRUE with CTS on.

• 31577 - Rotary Joint (Deublin 903-140-188), Kit 34204. Torque the 24 mm hex to 35 Nm (25.8 ft-lbs).