Operation Manual
3. Installation
C SERIES Operation Manual rev 3.0.0
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To calculate the maximum heat emission value when installing the ampliers in rooms with an air-conditioning
system, please refer to the Current Draw and Thermal Emissions specications provided in the Appendix
(section 6.4).
3.4. Operating Voltage
The label placed to the right of the mains cable on the rear of the amplier indicates the AC mains voltage for which
the amplier is wired and approved: 115 V or 230 V. Connect the power cable only to the AC source type referred
to on the label. The warranty will not cover damage caused by connecting to an incorrect type of AC mains.
LAB GRUPPEN switch-mode ampliers use primary switching. Because the mains power is rectied directly in
front of the transformer, the amplier is insensitive to mains frequency. It may be connected to 50 or 60 Hz sources,
and actually will operate on line frequencies from DC to 400 Hz.
If the power plug mounted at the factory is not appropriate for your country, it can be removed and the proper
connector wired in its place as follows:
BLACK or BROWN LIVE
WHITE or BLUE NEUTRAL
GREEN or GREEN/YELLOW EARTH (GROUND)
If you are not 100% condent of your competence to replace the mains plug, engage qualied personnel to do the
job.
Once a suitable AC supply is connected, the amplier can be turned on using the front-panel power switch. The
amplier then goes through a soft-start sequence as it self-checks its circuits. The fans will blow at high speed
before dropping to idle, and the “power” LED will illuminate.
Inrush power is controlled and limited during “soft start”, enabling multiple ampliers to be powered up
simultaneously.
3.5. Grounding
There is no ground lift switch or terminal on the C Series ampliers. The signal ground is always oating, via a
resistor, to chassis and therefore the grounding system is automatic.
In the interests of safety, never disconnect the earth (ground) pin on the AC power cord.
Use balanced input connections to avoid hum and interference.