> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/eme/manual/maintenance-and-cleaning.md).
# Maintenance and cleaning
In the following sections, the maintenance is described, which is required for optimal and trouble-free operation. If you have questions about maintenance work and intervals contact the manufacturer.\
Connections for higher currents must be checked for clean contacting and mechanical strength (tensile test).
| Component | No. / System | After setup | Monthly | Yearly | To Do |
| ---------------------------------------------- | ------------ | ----------- | ------- | ---------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
| High current contacts
motorphases
| 9 | X | | X | Check proper connection of the ring-lugs. Do the ring lugs lie flat on the contact area? Are the nuts pulled tight? Do a manual tensile test on the cable. |
| High current contacts HV DC | 12 | | | X | |
| calibration | 1 set | | | According
To aggreement
Typ. 1..3 years
| EME calibration needs to be done on site with calibration kit. |
| EME internal cooling circuit | 3 | x | X | | Check water pressure at manometer (see chapter 11.1.1). ggf. nachfüllen (siehe Kapitel 11.1.2) |
#### Cooling water pressure check
#### Fill the cooling water
If the internal pressure drops below 1 bar, the internal cooling circuit must be refilled. To do so, connect a tube with ½“ fitting to the refill connection (see picture above) and fill with a water/glycol mixture with a pressure of at least 3 bar.
Optimum mixture is:
* 25% glycol
* 75% clean water
Open the valve behind the refill connection to let water/glycol mixture flow into the internal buffer. Close the valve when the manometer shows 2,5 bar. Disconnect the filling tube, and clean remnants of eventually spilled water/glycol.
|  | WARNING!
Beware of the health and environmental risk of glycol coolant mixture
- Coolant mixture may never be inhaled or swallowed or get in contact with eyes
- Avoid contact with your body or skin.
- If you were in contact with glycol, wash yourself properly.
- Coolant mixture may never get into the environment
- Make sure that spilled coolant mixture is properly wiped away and dispose the cloth appropriately.
|
| -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
### Cleaning
Switch off system bevor cleaning, service and maintenance and measures and secure against immediate restart.
Cool off system before cleaning and service.
The surface of devices can be cleaned with a damp cloth.
If water or is present in the drip pan, absorb it with a dry cloth.
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