Installation manual

Série 32 Mlift Vector - Prog.Vectorielle Installation manual Chapter I - page 16
USE OF DIFFERENTIAL CIRCUIT BREAKERS
WITH AUTINOR FREQUENCY DRIVES (4/4)
First of all as a reminder :
• The low voltage directive explicitly states that electrical lift installations are excluded from
its field of application and so the standards relating to electrical installations only applies
as far as the input terminals of the main lift installation switch (cf EN 81 § 13.1.1.2) ;
• Nevertheless the safety of all people must be ensured, and so to do this, we rely as
much as possible on the detail of C 15-100 taking into account the imperatives
concerning lifts.
The standard C 15-100 § 532.2.1.3 states that :
«
Les dispositifs de protection à courant différentiel-résiduel doivent être choisis et les
circuits électriques divisés de telle manière que tout courant de fuite à la terre susceptible
de circuler durant le fonctionnement normal des appareils ne puisse provoquer la coupure
intempestive du dispositif.
»
AUTINOR frequency drives have a normal current leakage when loaded around 100 mA. We
therefor recommend the Lift installation be supplied through a differential circuit breaker with a
differential current (= « sensitivity ») Iδ
n
= 300 mA.
What is more, C 15-100 states that for electrical installations cabled conform to the TT
diagrams (installations powered by the public electricity network), people should be protected
against indirect contacts by differential residual current circuit breaker which implies the
following of the relation ship which links the circuit breaker differential current Iδ
n
to the
maximum conventional voltage of the
U
L
contact and of the earthing socket resistance :
Iδ
n
* R
A
≤
U
L
(NF C 15-100 § 532.2.4.2)
If the earthing socket resistance exceeds 100 Ω, the electrician may use an S type
differential circuit breaker with a differential current of 300 mA, which will ensure protection
against indirect contact for an earthing socket resistance of up to 167 Ω. You should
nevertheless ensure that a « full load » movement does not break the circuit at the wrong
moment.