Power Supply; Safety Devices; Installation - OM POWER OM2000A+ Instruction 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 230 - 250 VAC. Factory setting is 240VAC.
If the AC voltage in your network is 230 or 250 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.
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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