Lab.gruppen PLM Series Operation Manual

Also see for PLM 10000Q: Supplementary guide User manual addendum Specifications Quick start Technical data

Contents

Lab.gruppen PLM Series Operation Manual Manual pdf 93 page image

Application Guide87PLM Series Operation Manual Rev 1.3.510.2.1 Six PLM Series Devices with 230-240 V Mains SupplyIf the mains supply is 230 V and the system requirement is six PLMs, then the mains capacity would needto be able to provide 3 x 32 A. There are two methods of achieving this:1. Three racks, each with two PLMs and a 32 A single-phase mains supply. The 32 A capacity is sharedbetween the two PLMs within the rack. This is beneficial as the two PLMs don’t have to draw thesame current. The only limitation is that in combination they don’t draw over 32 A.2. Three racks, each with two PLMs and a 16 A three-phase mains supply. This requires central powerdistribution to be configured as two 3 x 16 A circuits from 3 x 32 A. One phase is used for each PLMwithin the rack. This has the benefit that each PLM has its own breaker, but they all have to operatewithin the same limit of 16 A; therefore, more care must be taken to ensure that no breaker blows ifdifferent loads are used.The 230 V version of the PLM is equipped with aslow-blow 30 A ceramic breaker.10.2.2 Six PLM Series Devices with 100-120 V Mains SupplyIf the mains supply is 115 V and the system requirement is 6 PLMs, then the mains capacity would need tobe able to supply two 3 x 30 A circuits. There are two methods of achieving this:1. Two racks, each with three 230 V version PLMs and a 30 A three-phase mains supply. In the rackthe PLMs are connected between the phases, i.e. one between phase 1 and 2, one between phase2 and 3 and the last between phase 3 and 1. Each 30 A mains breaker is shared between two PLMsand the mains current is to some extent canceled. This has the benefit that the three PLMs don’thave to draw the same current; one can be allowed to draw a little more than the other two. Theonly limitation is that in combination they don’t draw over 30 A.2. Two racks, each with three 115 V version PLMs and a 30 A three-phase mains supply. One phase isused for each PLM within the rack. This has the benefit that each PLM has its own breaker, but theyall have to operate within the same limit of 30 A; therefore, more care must be taken to ensure thatno breaker blows if different loads are used.10.3 Gain StructureThe PLM Series architecture provides gain adjustments at various points in the signal path and therefore,various places for muting and level adjustment. Each mute or gain adjustment point serves a differentpurpose. The signal flow diagrams in chapter 6 provide a useful reference for the signal path. The followingsections describe the various adjustment points, all of which are available via the Lake Controller software.