Installation In The Usa And Canada; General Considerations; Electrical Connection - Grundfos CRE Betriebsanleitung

1. Installation in the USA and Canada

In order to maintain the UL/cUL approval, follow
these additional installation instructions.
Note
The UL approval is according to UL508C.
These additional instructions apply only to
single-phase pumps and three-phase pumps up
Note
to and including 7.5 kW.

1.1 Electrical connection

1.1.1 Conductors
Use 140/167 °F (60/75 °C) copper conductors only.
1.1.2 Torques
Power terminal, M4: 2.35 Nm.
Relay, M2.5: 0.5 Nm.
Input control, M2: 0.2 Nm.
1.1.3 Line reactors
Max line reactor size must not exceed 2 mH.
1.1.4 Fuse size/circuit breaker
If a short circuit happens the pump can be used on a mains
supply delivering not more than 5000 RMS symmetrical amperes,
480 V maximum.
Fuzes
When the pump is protected by fuses these must be rated for
480 V. Max. sizes are stated in table below.
Circuit breaker
When the pump is protected by a circuit breaker this must be
rated for a maximum voltage of 480 V. The circuit breaker must
be of the "Inverse time" type.
The interrupting rating (RMS symmetrical amperes) must not be
less than the values stated in table below.
USA - hp
2-pole 4-pole Fuse size
1 1 25 A
1.5 1.5 25 A
2 2 25 A
3 3 25 A
5 5 40 A
7.5 – 40 A
10 7.5 50 A
Europe - kW
2-pole 4-pole Fuse size
– 0.55 25 A
0.75 0.75 25 A
1.1 1.1 25 A
1.5 1.5 25 A
2.2 2.2 25 A
3 3 25 A
4 4 40 A
5.5 – 40 A
7.5 5.5 50 A
1.1.5 Overload protection
Degree of overload protection provided internally by the drive, in
percent of full-load current: 102 %.
738
Circuit breaker type/model
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
40 A / Inverse time
40 A / Inverse time
50 A / Inverse time
Circuit breaker type/model
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
40 A / Inverse time
40 A / Inverse time
50 A / Inverse time

1.2 General considerations

For installation in humid environment and fluctuating
temperatures, it is recommended to keep the pump connected to
the power supply continuously. This will prevent moisture and
condensation build-up in the terminal box.
Start and stop must be done via the start/stop digital input
(terminal 2-3).
Subject to alterations.