NC4+ Blue non-contact tool setting system installation guide
4.2
Maintenance
Removing and refitting the filter elements (see figure on page 4.3)
Regularly inspect the filter elements (A). They should be replaced when dirty or wet and at least once
each year:
1. Switch off the air supply.
2. Unscrew the filter bowl by hand.
3. Remove the O-ring from the recess in the filter bowl. Discard the O-ring.
4. Unscrew and remove the filter elements from filter body.
5. Fit the replacement filters. These are shown in the dotted box (A) in the figure on page 4.3.
6. Fit a new O-ring into the recess in the filter bowl.
7. Refit the filter bowl and screw hand-tight.
8. Switch on the air supply and set the pressure as described in “Setting the NC4+ Blue system air
pressure” on page 3.9.
NOTE: Items shown within dotted box (A) are included in the air lter service kit obtainable from
Renishaw (see “Parts list” on page 6.5).
Removal and replacement of membrane dryer module
Regularly inspect the dew point indicator on the membrane dryer. The module should be replaced
according to the table below or at least once every four years.
Dew point indications
Grain colour Causes Solutions
Blue Normal operation. No action required.
Pink, white or brown Water and oil flow into
membrane dryer.
1. Check and replace filters if
necessary.
2. Check condition of inlet air
for excess oil or water.
Pink or white Input air temperature too high. Lower input temperature. Install
in-line air coolers if necessary.
Purge air exit obstructed. Check outlet of air purge port.
Green Membrane dryer near end of
useful life.
Replace membrane and dew
point checker.
Grains crushed Water flow into membrane air
dryer.
Resolve source of water ingress
and replace dew point checker.
NOTES:
Allow a minimum of 1 hour from start of air ow for the dew point indicator to turn blue.
Items shown within dotted boxes (B) and (C) are included in the membrane dryer service kit obtainable
from Renishaw (see “Parts list” on page 6.5).
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