User Manual

Page 29
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
2.3.4.3 Strain relief and plug xture
ThereisastandardxturemountedtotheACinputcon-
nection block on the rear. It’s used to prevent the AC plug
from loosening and disconnecting due to vibrations or
similar.Thextureisalsousedasstrainrelief.
Using the 4x M3 acorn nuts, it’s recommend to mount the
xturetotheAClterblockeverytimetheACplughas
been plugged again.
It’s furthermore recommended to install the strain relief
by using suitable cable straps (1 or 2 pcs, not included),
asdepictedintheguretotheright.
2.3.4.4 Connection variants
In a situation when multiple units are operated in parallel and there is a three-phase supply available, it should be
used in order to distribute the phase load as equally as possible. The ideal setup would be three units or a multiple
ofthree.Anynumberofunitsonthesameconnectionpointresultsinadi󰀨erentconnectionscheme.Herearea
few example for comparison:
Single unit Two units, unbalanced phase load
PSB
2.5 kW
L1(A)
N
L2
L3
L1
(A)
L2
(B)
L3
(C)
N
PSB
2.5 kW
L2
L3
PSB
2.5 kW
L2
L3
oder
PSB
2.5 kW
L2(B )
N
L2
L3
oder
PSB
2.5 kW
L3(C )
N
L2
L3
Three units, balanced phase load
L1
(A)
L2
(B)
L3
(C)
N
PSB
2.5 kW
L2
L3
PSB
2.5 kW
L2
L3
PSB
2.5 kW
L2
L3