Grundfos VLSE, Installation And Operating Instructions Manual

Page: 13 / 48

13
English (US)
14. Mechanical installation
The pump must be secured to a solid foundation by means of
bolts through the holes in the flange or baseplate.
14.1 Motor cooling
To ensure sufficient cooling of motor and electronics, observe the
following requirements:
• Make sure that sufficient cooling air is available.
• Keep the temperature of the cooling air below 104 °F (40 °C).
• Keep cooling fins and fan blades clean.
14.2 Outdoor installation
When installed outdoors, the pump must be provided with a
suitable cover to avoid condensation on the electronic
components. See fig.
4 .
Fig. 4 Examples of covers
Remove the drain plug pointing downwards in order to avoid
moisture and water build-up inside the motor.
Vertically mounted pumps are IP55 after removal of the drain
plug. Horizontally mounted pumps change enclosure class to
IP54.
15. Electrical connection
For description of how to connect E-pumps electrically, see the
following pages:
15.1 Three-phase pumps, 3-10 hp , page 13
15.2 Three-phase pumps, 15-30 hp , page 15 .
15.1 Three-phase pumps, 3-10 hp
15.1.1 Preparation
Before connecting the E-pump to the power supply, take the
issues illustrated in the figure below into consideration.
Fig. 5 Power supply-connected pump with power switch,
backup fuses, additional protection and protective
grounding
15.1.2 Protection against electric shock - indirect contact
EN 50178 and BS 7671 specify the following precautions when
leakage current > 3.5 mA:
• The pump must be stationary and installed permanently.
• The pump must be permanently connected to the power
supply.
• The grounding connection must be carried out as duplicate
leads.
Protective ground leads must always have a yellow/green (PE) or
yellow/green/blue (PEN) color marking.
15.1.3 Backup fuses
For recommended fuse sizes, see section 30.1 Supply voltage on
page 41 .
15.1.4 Additional protection
If the pump is connected to an electric installation where an
ground leakage circuit breaker (ELCB) is used as additional
protection, the circuit breaker must be of a type marked with the
following symbols:
This circuit breaker is type B.
The total leakage current of all the electrical equipment in the
installation must be taken into account.
The leakage current of the motor in normal operation can be seen
in section
30.3 Leakage current on page 40 .
During start and at asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
15.1.5 Motor protection
The pump requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking (IEC 34-11, TP 211).
15.1.6 Protection against voltage transients
The pump is protected against voltage transients by built-in
varistors between the phases and between phases and ground.
1RWH
1RWH
In order to retain the UL/cUL approval, follow the
additional installation procedures on page
43 .
TM0
0
8
62
2 0
1
0
1
-
TM
0
2
85
14
03
0
4
Warning
The user or the installer is responsible for the
installation of correct grounding and protection
according to current national and local
standards. All operations must be carried out by
qualified personnel.
Warning
Never make any connections in the pump
terminal box unless all electric supply circuits
have been switched off for at least 5 minutes.
Note for instance that the signal relay may be
connected to an external supply which is still
connected when the power supply is
disconnected.
The above warning is indicated on the motor
terminal box by this yellow label:
TM0
0
9
27
0 4
6
9
6
Warning
The pump must be grounded in accordance with
national regulations.
As the leakage current of 5-10 hp (4 - 7.5 kW)
motors is > 3.5 mA, take extra precautions when
grounding these motors.
L1
L2
L3
L2
L1
L3
PE
ELCB
ELCB