Overload Relays; Starting Method; Wiring Diagrams; Direction Of Rotation - Grundfos SRP Installation And Operating Instructions Manual

2 10 4
A1 A2
Netz
Netz 230V 40-60Hz P3VA
Rel. Ue 400V le 2.5A AC15
a
5 7
Fig. 15 Adjusting the relay
2 10 4 1
A1 A2
Netz
arnold ag
A Grundfos Company
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
ALR 20/A Ex
SEV 05 ATEX 0131
Sonde
5 7
Sensor
Fig. 16 ALR 20 relay connections
Do not check the leak sensor with an ohmmeter
Note
or other measuring instruments. The leak sensor
is an electronic component.

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 x 0.58.
N
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.
14
1 3
Rel.
b
ALR 20/A
3
Rel.
CH - 6105 Schachen
Storung
1258

7.5 Wiring diagrams

U1 V1 W1 W2 U2
Fig. 17 Three thermal switches (PTO)
Terminals Description
Ends of the three stator windings
1, 2, 3, 4, 5, 6
(U1, U2, V1, V2, W1, W2)
11, 12 Thermal switches (F6)
21, 22 Leak sensor in gearbox (B)
U1 V1 W1 W2 U2
Fig. 18 Three PTC sensors
Terminals Description
Ends of the three stator windings
1, 2, 3, 4, 5, 6
(U1, U2, V1, V2, W1, W2)
PTC sensors (according to DIN 44 081)
31, 32
(ϑ1, ϑ2, ϑ3)
21, 22 Leak sensor in gearbox (B)

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).
V2 PTO LS PE
B
V2 PTC LS PE