Groeneveld EG1703P03, Общее руководство

Страница: 14 / 48

Principle of operation 14
Dat
e
of i
ss
u
e : J
a
nu
a
ry 2011
Automatic Greasing System Twin-3
EG1703P03
2.3.2 5/2 way valve
When the 5/2-way valve is at stationary (not switched on by the control unit, see Figure 2.6),
greasing will take place through primary grease line-A and the pressure in primary grease line-B
will decrease and the grease will be lead back to the reservoir through return line R
B
.
Figure 2.6 5/2-way valve
When the 5/2-way valve is switched on by the control unit, the grease supply channel P will be
connected to primary grease line-B and primary grease line-A will be connected to return line R
A
in
the pump. Greasing takes place through primary grease line-B, the pressure in primary grease line-
A will decrease and the grease will be lead back to the reservoir through return line R
A
.
For an extensive description of the greasing cycle and the influence of the position of the 5/2-way
valve on the greasing cycle, see paragraph 2.2.
2.3.3 Relief valve
A relief valve is mounted in the grease line between the piston-pump and the 5/2-way valve (see
Figure 2.2/14). When the grease pressure exceeds 250 bar during the pumping phase, the relief
valve will redirect the grease to the reservoir.
The maximum grease pressure will be exceeded when:
• a malfunction of the pressure switch, which is mounted in the system, occurs;
• a malfunction in the cable of the pressure switch occurs.
The pressure switch is intended to end the pumping phase, as soon as the minimum required grease
pressure is reached.
2.3.4 Test push button
The grease system can be tested by starting one or more cycles by means of the test push-button
on the pump unit (see Figure 2.2/12). This button also can be used to reset the control unit.
P
A Primary greas line A (port A)
B
Primary greas line B (port B)
P From pump
R
A
Return line A to grease reservoir
R
B
Return line B to grease reservoir