E
nglis
h (
G
B)
14
Fig. 15
Adjusting the relay
Fig. 16
ALR 20 relay connections
7.3 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).
7.4 Starting method
Continuous operation
We recommend star-delta starting, soft starter or frequency
converter throughout the entire power range.
Intermittent operation
Start via softstarter or frequency converter is mandatory
throughout the entire power range.
7.5 Wiring diagrams
Fig. 17
Three thermal switches (PTO)
Fig. 18
Three PTC sensors
7.6 Direction of rotation
When the electrical connections have been carried out, check
that the impeller is rotating in the correct direction. When viewed
from the motor, the impeller should rotate clockwise. An arrow on
the motor housing shows the correct direction of rotation.
If the impeller rotates in the wrong direction, interchange two
phases of the mains supply (L1, L2, L3).
T
M
02 8
8
66 0
904
T
M
03
2060
3505
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
2
50 V
T
M
02 49
40 18
02
Terminals
Description
1, 2, 3, 4, 5, 6
Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
11, 12
Thermal switches (F6)
21, 22
Leak sensor in gearbox (B)
T
M
02 4
932 1
802
Terminals
Description
1, 2, 3, 4, 5, 6
Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
31, 32
PTC sensors (according to DIN 44 081)
(
ϑ
1,
ϑ
2,
ϑ
3)
21, 22
Leak sensor in gearbox (B)
B
LS
V2
U2
W2
W1
V1
U1
PE
PTO
LS
V2
U2
V1
U1
W2
W1
PTC
PE
