Grundfos SRP 70.30.814.25.Ex.5.1D.A, Инструкция по установке и эксплуатации

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15
7.7 Protection from electro-chemical corrosion
Two different metals or alloys cause electro-chemical corrosion if
they are connected by an electrolyte. This applies if more than
one pump is installed in the same tank. We recommend the
following additional protection:
• galvanic separation of the earth conductor from the neutral
conductor or
• galvanic separation of the mains supply by means of an
isolation transformer.
The earth conductor must be separated in such a way as to
ensure that no direct current can flow through it. It must still
function as a protective conductor. This can be achieved with a
limiting unit (polarization cell or anti-parallel diode) or an isolation
transformer.
Fig. 19
Protection from electro-chemical corrosion
8. Start-up
Check the oil level in the gearbox before starting up the pump.
The oil level must cover between 50 and 75 % of the gearbox.
If required, fill oil into the gearbox through the oil filling hole
(pos. 2). For oil quality and quantity, see section
9.3 Oil
.
If the pump has been in stock for a period before start-up, see
section
9.2 Service chart
.
Fig. 20
Oil check and oil filling
Checks before start-up
1. Check that the impeller is rotating in the correct direction.
See section
7.6 Direction of rotation
.
2. Make sure that the pump is completely submerged in the
liquid.
3. Make sure that there are no solid objects in the tank.
T
M
02 94
80 27
04
Pos. Designation
1 Limiting unit
2 Earth conductor
3 Isolation transformer
Warning
When using an isolation transformer, the ratio
between starting current and rated current (I
A
/I
N
)
must not be altered.
L1
L2
L3
N
PE
1
3
2
2
Warning
When slackening the oil level screw, note that
pressure may have built up in the chamber.
Do not remove the screw until the pressure has
been fully relieved.
T
M
02
9479
2704
Caution
The pump must always be submerged during
operation.
Warning
Make sure that no persons can fall into the tank.
1 3
2