I/O Panels; Power Distribution - Lab.gruppen PLM Series Operation Manual

12.1 I/O Panels

System interconnection on-site is made quicker and
simpler if racks are prewired internally to connection
panels. If the panels are fitted to the front of the rack,
all audio, loudspeaker, network and power cables may
then be simply plugged in at one position without
requiring access to the rear of the rack.
Rental companies and other large system users will
most likely already have their own preferred designs
for such panels; figure 12.1 is a suggested layout
which others may find useful. This panel is used
purely for audio connections (both AES/EBU and
analog). A separate panel can be used for Ethernet
connections.

12.2 Power Distribution

For professional applications it is recommend that the
sum of the available mains power is above 3000 W
per PLM (e.g. 230 V x 16 A, 120 V x 32 A). Please see
the following examples suggesting power distribution
methods across multiple PLM devices.
6 x PLM and 230-240 V mains supply.
If the mains supply is 230 V and the system
requirement is six PLMs, then the mains capacity
would need to be able to provide 3 x 32 A. There are
two methods of achieving this:
▸ Three racks, each with two PLMs and a 32 A
single phase mains supply. The 32 A capacity is
shared between the two PLMs within the rack.
This is beneficial as the two PLMs don't have to
Figure 12.1: Example I/O Connector Panel
▸
6 x PLM and 100-120 V mains supply.
If the mains supply is 115 V and the system
requirement is 6 PLMs, then the mains capacity
would need to be able to supply two 3 x 30 A circuits.
There are two methods of achieving this:
▸
▸
APPLICATION GUIDE 12
draw the same current. The only limitation is that
in combination they don't draw over 32 A.
Three racks, each with two PLMs and a 16 A
three phase mains supply. This requires central
power distribution to be configured as two 3 x 16
A circuits from 3 x 32 A. One phase is used for
each PLM within the rack. This has the benefit
that each PLM has its own breaker, but they all
have to operate within the same limit of 16 A;
therefore, more care must be taken to ensure that
no breaker blows if different loads are used.
Two racks, each with three 230 V version PLMs
and a 30 A three phase mains supply. In the
rack the PLMs are connected between the
phases, i.e. one between phase 1 and 2, one
between phase 2 and 3 and the last between
phase 3 and 1. Each 30 A mains breaker is shared
between two PLMs and the mains current is to
some extent canceled. This has the benefit that
the three PLMs don't have to draw the same
current; one can be allowed to draw a little more
than the other two. The only limitation is that in
combination they don't draw over 30 A.
Two racks, each with three 115 V version PLMs
and a 30 A three phase mains supply. One phase
is used for each PLM within the rack. This has
the benefit that each PLM has its own breaker,
but they all have to operate within the same limit
PLM Series Operation Manual 59