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Download page T28959, T28960 replacement cooling valve_2.
T28959, T28960 replacement cooling valve_2
qualification
Qualified personnel
Material
| Pos | Designation | Article | Number | |
|---|---|---|---|---|
| T28959 | T28960 | |||
| 01 | Kolben | T28524 | - | 1 |
| 02 | housing | T28847 | 1 | 1 |
| 03 | Lifting seal 4x10x4.2 (assembled) | T21756 | 1 | 1 |
| 04 | disc 12x2,5 (assembled) | T28865 | 1 | 1 |
| 05 | locking ring 13x1 (assembled) | B1255126 | 1 | 1 |
| 06 | Cylindrical pin 6x30 (assembled) | B1306553 | 1 | 1 |
| 07 | O-ring FPM 24x2 (optional) | T28658 | - | - |
Required material
- Torx screwdriver size 20
- Open end wrench, SW10
procedure
ATTENTION!
Working with the unit requires knowledge of the safety instructions and quick guide. That's why:
Read the safety instructions and quick guide carefully before starting any work. The basic requirement for safe work is compliance with all safety instructions and careful action by qualified qualified personnel to prevent accidents involving personal injury and property damage.
Cool down and empty the unit
- On the basic screen, tap the function button (
). - On the basic screen, tap the function button (
).
→ The unit cools down and evacuation the mold before switching it off.
Check pressure and switch off unit
- Select [Display] > [Actual Values] > [System Pressure].
→ The system pressure must display 0.0 (±0.1) bar. - The pressure shown by the pressure gauge must be 0.0 (+0.3) bar.
- Switch off the main switch (QS 1), pull out the mains-connector.
Remove covers
- Remove covers from the unit (→ Open unit).
Replace housing and piston
- Loosen the stepper motor screws attached to the housing.
- Turn the step motor (M 4), pull it out slightly and move it out of the coupling.
- Remove the pipeline (KV 2 ↔ cooler).
- Remove the mounting clips and remove the pipe on the side of the cooler first before it can be completely removed.
- Turn housing (1) until the bayonet lock is released. Then remove the housing with the seal including the piston rod.
Leakage due to incorrect installation!
Improper installation of the O-ring may damage it and lead to a leak. That's why:
- Make sure the O-ring is correctly installed.
- For T28959: Clean the piston and rod.
- For T28960: Use a new plunger.
- Use the piston to gently push out the mounting rod and move the piston all the way in (Fig.).
- A mounting rod is no longer required.
- Install the housing with the seal and the piston rod, by turning with a plug connection (bayonet lock).
- Check the pipe O-ring for wear and replace if necessary.
- Install the pipeline (KV 2 ↔ cooler) and secure with mounting clips.
- Drive in the step motor (M 4), turn it to the end position and secure it with the mounting screws.
Check tightness and function
- Connect the mains-connector and switch on the main switch (QS 1).
NOTE!
Set the user profile to “Maintenance” to access the parameter (Access rights).
- Select [Service] > [Parameter] > [Stepper Motors] > [Step motor 2] > [Positioning KV 2].
- Change the position and check whether the step motor (M 4) including the piston is moving or not:
- 0% = valve closed
- 100% = valve opened
-
Switch on the unit using the I/O button (
), check the tightness and function of the unit.
switch off unit and install covers
-
Switch off the unit using the I/O button ().
→ The unit switches off and, if necessary, is cooled and depressurised. - Switch off the main switch (QS 1).
- Re-attach covers from the unit (→ Open unit).