Lab.gruppen PLM series Quick Start Manual

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Lab.gruppen PLM series Quick Start Manual Manual pdf 12 page image

6InstallationPLM Series Quick Start and Field R eference G uide R ev 1.3.53.3 Cooling3.3.1 OverviewThe PLM Series devices use a forced-air cooling system with airflow from front to rear, allowing highcontinuous power levels without thermal problems. Front-to-rear airflow is preferable as air at the front ofa rack is cooler than that at the rear in nearly all situations; never attempt to reverse the airflow. The opera-tion of the PLM’s cooling system is dependent on front-to-rear airflow; it will not function effectively withexternal airflow in the opposite direction.Make sure an adequate air supply is provided in front of the PLM, and that the rear of the PLM hassufficient space to allow air to escape. If the PLM is rack-mounted, never operate the unit with any front orrear rack doors or covers in position. It is recommended to keep the ambient temperature around the PLMas cool as possible. An increased temperature can have a significant negative impact on the expectedlifetime on the components inside the PLM.Fit solid blanks (not ventilation blanks) to unusedrack spaces to ensure effective air circulation.Leaving gaps in between items of equipmentdegrades 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 allthe other equipment also uses front-to-rear airflow for cooling. If this precaution is not observed, there is arisk of overheating, as units with the reverse airflow will be drawing in air which has already been heated bythe PLMs.3.3.2 Temperature Sensing and ProtectionThe PLM is equipped with a sophisticated temperature sensing system which protects it from any overheat-ing which may occur as a result of inadequate ventilation.Always ensure the dust filters behind the detach-able front panel are clean to ensure maximumpossible airflow.3.4 Operating VoltageThe label adjacent to the mains (AC) input connector indicates the AC mains voltage for which thedevice is wired and approved. The PLM 10000Q and PLM 14000 devices are available in separate 115 V and230 V versions; the PLM 20000Q is only available with a universal power supply operating from 80 to 265 V.Only connect the mains cable (AC cord) to an AC source of the voltage shown on the label.