Lab.gruppen PLM 20000Q - Manual (Page 13)

Installation
7
PLM Series Quick Start and Field Reference Guide Rev 1.3.5
The PLM uses primary switching, which means the mains power is rectified on the primary side of the
transformer. This makes the power supply insensitive to mains frequency variation, and it will operate
normally on line frequencies from 45 to 75 Hz.
If the mains plug (AC plug) fitted to the mains cable (AC cord) is not appropriate for your country, it can be
removed and a locally-sourced one fitted instead, observing the color coding in the table below:
powerCON Pin 230 V Version 115 V Version
L Brown Black
N Blue White
Green/Yellow Green
Table 3-1: AC Plug Configuration
If you are not 100% confident of your competence to replace the mains plug (AC plug), the task should
be carried out by qualified personnel.
Once a suitable AC power supply is connected, the device can be turned on using the front panel power
button. When the device is turned on, the power button LED changes from red (Standby) to green (Active).
In-rush current is controlled and limited during the
soft-start sequence. This enables multiple PLMs on
the same AC mains circuit to be turned on simulta-
neously.
3.5 Grounding
Analog inputs feature Iso-Float ™ ground isolation, a technology which combines the benefits of transformer-
coupled isolation with the advantages of clean, direct-coupled inputs.
The audio converters are galvanically isolated, and not connected to mains ground. High-speed transformers
and opto-isolators create a barrier between the device and the outside electrical environment.
The Iso-Float feature is activated by default, but may
be disabled via the Lake Controller software, or via
the front panel menu.
Use correctly-shielded balanced audio input connections to minimise hum and interference. Please refer to
section 7.1.5 of the PLM Series Operation Manual for further information.
NEVER disconnect the earth (ground) pin on the mains cable (AC power cord).