En
gl
is
h (
G
B)
14
Fig. 13
Adjusting the relay
Fig. 14
ALR-20/A relay connections
4.5.3 Overload relays
The motor must be protected against overload via a
thermal delay relay according to local regulations.
The relay must be adjusted to the rated current
stated on the nameplate.
In the case of star-delta starting, the adjustable value
is to be I
N
x 0.58.
Incorporate electro-thermal all-pole triggers in all six
mains conductors (U1, V1, W1 and U2, V2, W2).
4.6 Protection against 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
•
galvanic separation of the mains supply by
means of an isolation transformer
•
anode kit.
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. 15
Protection from electro-chemical
corrosion
TM
02
88
66
09
04
TM
0
3
2
060
3
505
Note
Do not check the leak sensor with an
ohmmeter or other measuring instruments.
The leak sensor is an electronic
component.
ALR 20/A
5
7
Netz 230V 40-60Hz P3VA
Rel. Ue 400V le 2.5A AC15
2
10
4
1
3
A1 A2
Netz
Rel.
a
b
2
10
4
1
3
A1
A2
arnold ag
Lecksonden Relais
Netz 230V 50-60Hz P3VA
II (2)G [EEx ib] IIC
nur für den Anschluss von Arnold AG
Lecksonden Typ AL05 Ex
Schaltpunkt
Storung
ALR 20/A Ex
SEV 05 ATEX 0131
1258
5
7
Sonde
Rel.
Netz
CH - 6105 Schachen
A Grundfos Company
Sensor
L
N
5 A
250 V
T
M
02
94
80
27
0
4
Pos.
Designation
1
Limiting unit
2
Earth conductor
3
Isolation transformer
Caution
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
Содержание SRG 60 Hz
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