Grundfos VLSE, Installation And Operating Instructions Manual

Page: 15 / 48

15
English (US)
15.1.10 Three-phase pumps, 3-10 hp
Group 3: Power supply (terminals L1, L2, L3)
Fig. 7 Connection terminals
A galvanic separation must fulfill the requirements for reinforced
insulation including creepage distances and clearances specified
in EN 60335.
15.2 Three-phase pumps, 15-30 hp
15.2.1 Preparation
Before connecting the E-pump to the power supply, take the
issues illustrated in the figure below into consideration.
Fig. 8 Power supply-connected pump with power switch,
backup fuses, additional protection and protective
grounding
15.2.2 Protection against electric shock - indirect contact
EN 61800-5-1 specifies that the pump must be stationary and
installed permanently when the leakage current is > 10 mA.
One of the following requirements must be fulfilled:
• A single protective ground lead (7 AWG minimum copper)
Fig. 9 Connection of a single protective ground lead using
one of the leads of a 4-core power cable (7 AWG
minimum)
• Two protective ground leads of the same cross-sectional area
as the power supply leads, with one lead connected to an
additional ground terminal in the terminal box.
Fig. 10 Connection of two protective ground leads using two of
the leads of a 5-core power supply cable
Protective ground leads must always have a yellow/green (PE) or
yellow/green/blue (PEN) color marking.
T
M
05
2
9
8
5
08
12
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.
Warning
The surface of the terminal box may be above
158 °F (70 °C) when the pump is operating.
6: GND (frame)
5: +10 V
4: Setpoint input
3: GND (frame)
2: Start/stop
Group
1
Group
2
Group
3
13: GND (frame)
12: Analog output
11: Digital input 4
10: Digital input 3
1: Digital input 2
9: GND (frame)
8: +24 V
7: Sensor input
B: RS-485B
Y: Screen
A: RS-485A
TM
0
0
9
270
4
696
Warning
The pump must be grounded in accordance with
national regulations.
As the leakage current of 15-30 hp motors is
> 10 mA, take extra precautions when grounding
these motors.
TM
0
4
3
021
3
508
TM0
3
8
60
6 2
0
0
7
L1
L2
L3
L2
L1
L3
PE
ELCB