The DC power supply can be at any voltage in the range defined in the technical
specifications (the Appendix of this guide). The supply source must comply with the safety
aspects of the relevant requirements, in accordance with the most recent version of the
standard EN60950 or equivalent Low Voltage Directive Standard, all according to the
applicable over-voltage category. If the power source to the power supply is the AC line
(through an isolated transformer), safety margins must be considered, in order to avoid
activating the under/over voltage protection due to line variations and/or voltage drop
under load.
In addition to the above, the transformer must comply with the safety aspects of the relevant
requirements in accordance with the most recent version of the standard EN60742 (Isolating
and Safety Isolating Transformers). The nominal DC bus voltage should be in the following
range:
1.2 Vdcmin < Vdc < 0.9 Vdcmax
where:
Vdcmin is the minimum DC bus
Vdcmax is the maximum DC bus
The recommended minimum power supply capacitance for a single-phase rectified DC source
connection is as follows:
Amplifier Voltage Range 60 V 100 V
Recommended capacitance ≥ 470 µF ≥470 µF
The transformer power should be calculated such that it will be able to deliver power to the
amplifier (including peak power) without significant voltage drops.
The power supply should be located as close as possible to the amplifier. The maximum
distance is 30 cm (1 foot). While driving high-inertia loads, the power supply must be
equipped with a shunt regulator; otherwise, the amplifier will be disabled whenever the
capacitors are charged above the maximum voltage, during motor break down.
Ocarina/Castanet Installation Guide Installation
MAN-OCSIG (Ver. 1.2)
3-10