Application Guide; Rack I/O Panels; Power Distribution - Lab.gruppen PLM 20K44 Operation Manual

10. Application Guide

10. Application Guide
This chapter describes the practical application and use of PLM+ Series devices.

10.1. Rack I/O Panels

For fast and simple system connection, pre-wired racks using connection panels can be used. With an I/O
connector panel fitted to the front of the rack, all audio, loudspeaker, network and power cables can be plugged in
at one position, without requiring rear panel access.

10.2. Power Distribution

For professional applications it is recommended 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). As PLM+ devices are equipped with BEL, the current draw of the device
can be configured to perfectly match the power distribution.
Safety approved equipment is not required to have a mains breaker, as long as this does not pose any fire hazard
under fault conditions, as is the case with the PLM+. Please see the following examples suggesting power
distribution methods across multiple PLM+ devices. All of the examples given will work, although the first examples
for both 230 V and 115 V operation have a slight advantage due to their "power sharing" ability.
10.2.1. Six PLM+ Series Devices with 230-240 V Mains Supply
If the mains supply is 230 V and the system requirement is six PLM+s, then the mains capacity would need to be
able to provide 3 x 32 A. There are two methods of achieving this:
1. Three racks, each with two PLM+s and a 32 A single-phase mains supply. The 32 A capacity is shared
between the two PLM+s within the rack. This is beneficial as the two PLM+s don't have to draw the same current.
The only limitation is that in combination they don't draw over 32 A.
2. Three racks, each with two PLM+s 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. Note: The
230 V version of the PLM+ is equipped with a slow-blow 30 A ceramic breaker.
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PLM+ SERIES Operation Manual rev 1.0.0