Adjustment Of Impeller Clearance For Pumps In Dry Installation; Explosion-Proof Pumps; Motor Cable; Cable Entry - Grundfos SEN series Montage- Und Betriebsanleitung

8.2.3 Adjustment of impeller clearance for pumps in dry
installation
The impeller clearance can be adjusted while the pump is
mounted on the base stand and connected to the pipework,
see fig. 15.
Procedure:
1. Slacken all fixing screws and adjusting screws between pump
housing and motor.
2. Tap on the pump housing at several points using a rubber mal-
let to loosen the pump housing from the motor.
3. Close the impeller clearance by tightening three of the fixing
screws until the impeller touches the pump housing. Do not
use unnecessary force.
4. Measure the distance X between the shaft seal housing and
the pump housing at three points using a slide caliper, see
fig. 15.
5. Slacken the fixing screws and pull the motor 0.7 mm ±0.2 mm
out by tightening the three adjusting screws and using the dis-
tance X as reference.
6. Tighten all fixing screws and check that the distance X at the
three reference points is equal.

8.3 Explosion-proof pumps

Overhauled and repaired explosion-proof motors are marked with
a repair plate giving the following information:
• The repair symbol R.
• Name or registered trade mark of the repairing workshop.
• Workshop reference number relating to the repair.
• Date of overhaul or repair.
In the event of subsequent repairs, the existing plate should be
replaced by a new updated plate and earlier markings are
recorded.
The repairing workshop must keep records of performed over-
hauls and repairs together with records of all previous overhauls,
repairs and possible modifications. Copies of the repairing work-
shop's detailed records should be filed by the owner or operator
together with the original type certificate of the explosion-proof
motor in question.

8.3.1 Motor cable

Only cables which are approved by the manufacturer and suitable
for the cable entry as to diameter, number of leads, conductor
cross section and sheath material may be used for the motor.

8.3.2 Cable entry

Only EExd cable entry parts corresponding to the cable diameter
may be used. The corresponding cable dimension marking is
stamped on the inlet or the cable entry.
Secure the cable entry to the motor top cover by tightening the
screws evenly one by one until the cable entry is lying flat against
the top cover.

8.3.3 Spare parts

Damaged motor parts, such as top cover and cable entry, should
always be replaced by new and approved parts. Motor parts must
not be reconditioned by machining, re-tapping, welding, etc.
16

8.4 Contaminated pumps

Note: If a pump has been used for a liquid which is injurious to
health or toxic, the pump will be classified as contaminated.
If Grundfos is requested to service the pump, Grundfos must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise Grundfos can refuse to
accept the pump for service.
Possible costs of returning the pump are paid by the customer.
However, any application for service (no matter to whom it may
be made) must include details about the pumped liquid if the
pump has been used for liquids which are injurious to health or
toxic.