24
1. Installation in the USA and Canada
Note:
Applies only to single-phase pumps and three-phase
pumps up to and including 7.5 kW.
In order to maintain the UL/cUL approval, these additional instal-
lation procedures must be followed. The UL approval is according
to UL508C.
1.1 Electrical installation
1.1.1 Conductors
Use 140/167
°
F (60/75
°
C) copper conductors only.
1.1.2 Torques
Power terminal, M4: 21 in-lb. (2.35Nm.)
Relay, M2.5: 4.4 in-lb. (0.5 Nm.)
Input control, M2: 1.8 in-lb. (0.2 Nm.)
1.1.3 Line reactors
Line reactors are normally not required for use with 3-phase
Grundfos MLE and MGE motors.
If a line reactor is required, select the reactor per the inductance
limits listed below.
- Inductance < 1.5 mH (10hp and 7.5hp)
- Inductance < 2.0 mH (5hp - 1hp)
1.1.4 Fuse size/circuit breaker
The pump is "suitable for use on a circuit capable of delivering
not
more than 5000 A RMS symmetrical amperes, 480V maximum"
• when protected by fuses rated in the table below and/or
• "when protected by a circuit breaker having less let-through
energy (i2t) and
less let-through curent (Ip) than the fuse in the table below"
USA - hp
Europa - kW
* To comply with UL approval, use fuses with UL Fuse
classification UL 248. It is recommended to use fast-acting pre-
fuses by Bussmann type NOS fuses. Ferraz-Shawmut type
OTS and Littelfuse type NLS fuses can also be used.
A UL 489 listed inverse-time circuit breaker having less let-
through energy (i2t) and less let-through curent (Ip) than the max
pre-fuses listed above can also be used.
The voltage rating of the fuse and the inverse-time circuit breaker
must be at least the same voltage rating as the drive.
1.1.5 Overload protection
Degree of overload protection provided internally by the drive, in
percent of full-load current: 102%.
1.2 Before starting the pump
• The pump must always be connected to the power supply at
least one hour prior to start.
• From then on the pump must always be connected to the
power supply.
This procedure will help to avoid condensation in the terminal
box.
Circuit breaker type
Max. pre-fuse size Inverse time
2-
p
o
le
4-
p
o
le
3
/60/
460
3
/60/
208-2
3
0
3
/60/
460
3
/60/
208-2
3
0
Fuse Models
0.33 0.33
25 A
25 A
Bussmann NOS*
0.5
0.5
25 A
25 A
Bussmann NOS*
0.75 0.75
25 A
25 A
Bussmann NOS*
1
1
25 A
25 A
Bussmann NOS*
1.5
1.5
25 A
35 A
25 A
35 A Bussmann NOS*
2
2
25 A
35 A
25 A
35 A Bussmann NOS*
3
3
25 A
35 A
25 A
35 A Bussmann NOS*
5
5
40 A
60 A
40 A
60 A Bussmann NOS*
7.5
–
40 A
60 A
40 A
60 A Bussmann NOS*
10
7.5
50 A
50 A
Bussmann NOS*
2
-pole
4
-pole
M
ax.
pre
-fus
e
si
ze
C
irc
uit bre
aker
type
Fuse Models
–
0.55
25 A
25 A / Inverse time Bussmann NOS*
0.75
0.75
25 A
25 A / Inverse time Bussmann NOS*
1.1
1.1
25 A
25 A / Inverse time Bussmann NOS*
1.5
1.5
25 A
25 A / Inverse time Bussmann NOS*
2.2
2.2
25 A
25 A / Inverse time Bussmann NOS*
3
3
25 A
25 A / Inverse time Bussmann NOS*
4
4
40 A
40 A / Inverse time Bussmann NOS*
5.5
–
40 A
40 A / Inverse time Bussmann NOS*
7.5
5.5
50 A
50 A / Inverse time Bussmann NOS*
Subject to alterations.
Grundfos.bk Page 24 Tuesday, April 17, 2007 8:54 AM
