After the machine arrives, the wiring diagram and the installation drawing in the documentation supplied with it are the first two drawings that will be used. One of them decides how the electrical side is connected, the other decides where the machine stands and how the pipework runs. Whether these two are checked before the work starts decides whether the machine goes into service without delay or whether the work has to be redone.
Three things to check on the wiring diagram
The first is the supply conditions. The power supply of the ZYD-100 is three-phase 380V / 50Hz and the total power is 72 + 5 kW. Before anything is connected, confirm that the system, the rated voltage and the frequency on site match the nameplate and that the capacity has enough headroom, and that the rated current of the distribution circuit and the protective settings agree with each other. A wrong phase sequence or the wrong voltage level will trip the phase failure and phase sequence protection as soon as the supply is closed, and the site usually sees only a machine that will not start before going back to the wiring.
The second is the earthing. The earth terminal marked on the drawing has to correspond to the earthing conductor on site, and the earth line runs on its own rather than sharing a bundle with the signal lines. The earthing marks on the machine have to correspond to the numbers on the drawing, so that the acceptance check can go through them point by point.
The third is the control and protection circuits. The way the door interlock, the emergency stop circuit and the over-pressure audible and visual alarm are wired has to follow the drawing. Wiring these wrongly does not stop the machine at once; it means the protection fails to act at the moment it is needed. The way to check them is to trace every circuit against the drawing, rather than to count terminals.
Three things to check on the installation drawing
The first is the position and the dimensions. The dimensions of the ZYD-100 are 1200×1400×1800 mm and the weight is approx. 720 kg, so the load capacity and the levelness of the floor or foundation have to meet the requirement. The positions of the oil inlet and outlet connections on the drawing decide how the site pipework is connected, and where the drawing does not state a position, none should be assumed.
The second is the routing of the pipework. The suction line needs a continuous fall so that no air pocket forms, and the return line and the vacuum pipework follow the drawing. Low points need a drain point. The two-stage vacuum is connected in the order in which it is actually built: the ZYD-100 is fitted with the X-100 vacuum pump and the JRP-500 roots blower, with the roots blower in front, and this section connected the other way round will keep the vacuum level from rising.
The third is the working space and the access route. The space reserved on the drawing is not decoration; it is there for element replacement, oil draining and maintenance. If the machine is installed first and the filter housings can no longer be withdrawn or the draining port can no longer take a container, the machine has to be moved.
What else is in the handover documentation
| Document or material | Purpose | What to check in it |
|---|---|---|
| Wiring diagram and installation drawing | The basis for the site work | Supply system, earthing, position of the connections, routing of the pipework |
| Certificate of conformity and factory test records | The basis for delivery and acceptance | Model, serial number, whether the test items are complete |
| Element reference card | To identify the element specification at replacement | Coarse elements 150-250-50 and 110-250-50, secondary element 110-400-20, fine elements 110-600-5 and 150-500-5 |
| Operating and maintenance instructions | The basis for daily operation | Temperature setting, vacuum requirement, maintenance intervals |
| Wear parts list | For spare part purchases | Specification and quantities of pump oil, elements and seals |
How the check is best done
- Tick off the items on the drawing before the work starts. Doing this is much cheaper than changing the site afterwards.
- Put the earthing, the interlocks and the protection circuits on a separate check list. These are the ones that are hardest to trace when they are wrong.
- Record everything changed on site on the drawing, so that the drawing and the machine stay the same and the next shift does not have to work it out again.
- Link the equipment number to the nameplate, the drawings and the documentation, so that one missing number can be traced all the way through.
- Sign for the handover against the list item by item, and confirm missing or damaged parts on the spot rather than leaving them to the installation stage.
The documentation supplied with the machine is not an accessory that comes along with it; it is part of the machine. It only counts as delivered once it is actually being used.
An hour spent checking the drawings before the work starts is far cheaper than a day of changes on site afterwards.
