Cooling - Lab.gruppen PLM 20K44 Operation Manual

3. Installation

3.3. Cooling

3.3.1. Overview
direction.
space to allow air to escape. If the PLM+ is rack-mounted, never operate the unit with any front or rear rack doors
or covers in position. It is recommended to keep the ambient temperature around the PLM+ as cool as possible.
inside the PLM+.
NOTE: Fit solid blanks (not ventilation blanks) to unused rack spaces to ensure effective air circulation.
Leaving gaps in between items of equipment degrades the effectiveness of forced-air cooling.
If installing one or more PLM+ Series devices in a rack with other fan-cooled equipment, be sure that all the
3.3.2. Temperature Sensing and Protection
The PLM+ is equipped with a sophisticated temperature sensing system which protects it from any overheating
which may occur as a result of inadequate ventilation.
3.4. Operating Voltage
The label adjacent to the mains (AC) input connector indicates the AC mains voltage for which the device is wired
and approved. All PLM+ models incorporate a universal power supply operating from 65 V to 265 V, but with
UVL (Under Voltage Limiting) active below 80 V. Only connect the mains cable (AC cord) to an AC source of the
voltage shown on the label.
The PLM+ uses primary switching, which means the mains power is
transformer. This makes the power supply insensitive to mains frequency variation, and it will operate normally on
line frequencies from 45 to 75 Hz.
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PLM+ SERIES Operation Manual rev 3.0.1