Overload Protection - Grundfos CRE Notice D'installation Et De Fonctionnement

A.1.4. Electrical connection
Conductors
See the sections on electrical installation and cable requirements.
Torques
See the section on torques.
Line reactors
The maximum line reactor size in front of the drive must not exceed
the following values:
Maximum line reactor size
P2
1450-2000 rpm
[kW] [HP]
1450-2200 rpm
0.25 - 3 0.5 - 3 1.5
4 5 0.7
5.5 7.5 0.9
7.5 10 0.6
11 15 0.3
Exceeding these values creates resonance between the reactor
and the drive, which reduces the life 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, the circuit breaker
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
0.7
0.3
0.6
0.3
201