BSS Audio DPR-404 Owner's Manual - Manual (Page 8)

8
5.0 Mains Power Connection
Voltage: The DPR-404 operates on either 120 or 240 volt supplies. Use the
voltage selector switch to choose the required voltage setting. (See Figure
8.1).
Frequency: Both 60Hz and 50Hz are acceptable.
Fig 5.1 Mains fuse on
rear panel.
Grounding: The DPR-404 must always be connected to a 3-wire grounded
('earthed') AC outlet. The rack framework is assumed to be connected to the
same grounding circuit. The unit must NOT be operated unless the power
cables ground ('earth') wire is properly terminated - it is important for personal
safety, as well as for proper control over the system grounding.
AC Power Fusing: The incoming mains power is fused within the DPR-404 by
the fuse holder mounted on the rear panel. If it needs to be replaced it must
be properly rated as:
20mm T160mA for 240v AC
T250mA for 120v AC
It is most important for continued safety that this specification is adhered to,
and you will have found that spare fuses of this rating are supplied together
with your unit and manual. It is very unlikely that this fuse will fail during
normal use, and must be treated with some caution as to the cause, if it
should do so. One of the most likely reasons will be following the incorrect
setting of mains voltage switch on the rear panel. Another reason can be the
inadvertent connection of line to line rather than line to neutral phase
voltages when using a three phase power connection. In either case, the
internal transient suppressors (VDRs) can become damaged. If so, they’ll
consistently blow replacement fuses. You can be assured that they have
protected your unit from damage, that the cost of replacement is small and
that the VDR’s demise has saved the much higher cost of ‘blowing up’ an
entire unit. If blown, the VDRs will need removal to allow further use of your
unit.
If you believe this has happened, please refer to section 13.1 for the removal
and replacement procedure. They should be replaced as soon as possible to
ensure continued protection.
Mains Power connection