Electrical Connection - Grundfos MGE Serie Instrucciones De Instalación Y Funcionamiento

Electrical connection

Conductors
See section 7.2 Cable requirements, page 11.
Torques
Maximum tightening torques for the terminals can be
found in section Torques, page 65.
Line reactors
Maximum line reactor size must not exceed 1.5 mH.
Maximum line reactor size in front of the drive must
not exceed the following values:
Maximum line reactor
P2
[kW]
1450-2000 rpm
1450-2200 rpm
0.25 - 3
4
5.5
7.5
11
Exceeding these values will create resonance bet-
ween the reactor and the drive, which will reduce the
lifetime of the product.
Short circuit current
If a short circuit occurs, the pump can be used on a
mains supply delivering not more than 5000 RMS
symmetrical amperes, 600 V maximum.
Fuses
Fuses used for motor protection must be rated for
minimum 500 V.
Motors up to and including 10 hp require class K5
UL-listed fuses. Any UL-listed fuse can be used for
motors of 15 hp.
Branch circuit protection
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.
Overload protection
Degree of overload protection provided internally by
the drive, in percent of full-load current: 102 %.
[mH]
2900-4000 rpm
4000-5900 rpm
1.5 1.5
0.7 0.7
0.9 0.3
0.6 0.6
0.3 0.3
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