PLM Series Operation Manual rev 1.1.3
12. Application Guide
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12. Application Guide
Figure 12.1: Example I/O Connector Panel for a rack with 2 four-channel PLMs
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
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between the two PLMs within the rack. This is beneficial as the two PLMs don’t have to 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
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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.
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:
