Lab.gruppen PLM series Quick Start Manual

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

Lab.gruppen PLM series Quick Start Manual Manual pdf 11 page image

PLM Series Quick Start and Field Reference Guide rev 1.0.65. Installation115.4 CoolingThe PLM uses a forced-air cooling system with airflow from front to rear, allowing high continuous powerlevels without thermal problems. (Front-to-rear airflow is preferable as air at the front of a rack is coolerthan that at the rear in nearly all situations.) Never attempt to reverse the airflow. The operation of thePLM’s cooling system is dependent on front-to-rear airflow; it will not function effectively with airflow in theopposite direction.Make sure an adequate air supply is provided in front of the PLM, and that the rear of the PLM has sufficientspace to allow the exit air to escape. If the PLM is rack-mounted, never operate the unit with any front orrear rack doors or covers in position. Also note that any unused rack spaces should have solid blanks fitted(not ventilation blanks) to ensure efficient air circulation. Leaving gaps in between items of equipmentdegrades the effectiveness of forced-air cooling.If installing one or more PLM’s in a rack with other fan-cooled equipment, be sure that all the other unitsalso use front-to-rear airflow for cooling. If this precaution is not observed, there is a risk of overheating, asunits with the reverse airflow will be drawing in air which has already been heated by the PLMs.The PLM is equipped with a sophisticated tempera-ture sensing system which protects it from anyoverheating which may occur as a result ofinadequate ventillation. Should a power outputchannel overheat, the temperature sensing circuits will mutethat channel until the temperature reduces to a safe level. If thepower supply overheats, another sensing circuit will mute willreduce the overall output level of all channels in an effort tobring the PSU temperature down. If a problem still exists, asensing circuit will mute the power output channel that has thehighest temperature reading, thereby reducing the overalltemperature of the power supply until it reduces to a safeoperating level.Always make sure that the dust filters behind the detachable front panel are clean to ensure maximumpossible airflow.5.5 Operating VoltageThe label adjacent to the mains (AC) input connector indicates the AC mains voltage for which theamplifier is wired and approved. The amplifier is built in two versions: 115 V and 230 V. Connect themains cable (AC cord) only to an AC source of the voltage shown on the label.Any damage resulting from a PLM Series productbeing connected to an AC source of incorrectvoltage will not be covered by the warranty.