Power Supply; Safety Devices; Installation - OM POWER OM2000A+ Manual

3.2.

Power Supply

Power amplifier is using one 3 KVA toroidal transformer. A soft start is provided using relays and resistors (placed
on the switch-ON board). The high voltage is made by combining 4 x 575V AC (total abt. 3200V DC) @ 1.2A. Each
has its own rectifier and filter. In the high voltage circuit, safety resistors are employed to protect the amplifier
against overload (placed on the power supply board).
The separated supply for screen grid is regulated by stabilization with MOSFET and delivers abt. 330V DC at
100mA. Control grid voltage is also stabilized (-120V DC). Change of stabilized first grid voltage is controlled by
the software (EBS for example).
Primary section of the transformer is adjustable for 220 - 240 VAC (230 – 250VAC for US). Factory setting
is 230VAC. If the AC voltage in your network is 220 or 240 Volts, you need to set the correct value before
first starting of the PA. See part 7.1. for more information. Other primary voltage is possible on request
(for example 200V 50/60 Hz for Japan).
3.3.

Safety Devices

Control and monitoring circuits ensure control and safety during malfunctions of the PA. These are placed on the
Control board, which is located on the chassis subpanel.
4.

INSTALLATION

Read this chapter carefully prior you will start installation. Before unpacking inspect shipping carton
first, if it is not damaged. Keep all of packing parts for possible future shipment. Check unpacked power
amplifier. If you find some damaging, contact your dealer immediately to keep full warranty.
During installation go step by step according to the next parts.
One of the important safety element is mechanical switch
for AC blocking at opened amplifier. Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
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