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Phase/AMP Series DPA1/DCPA1
SECTION I - DESCRIPTION
1-1.
GENERAL.
1-2.
The Model DPA-1 Series PHASE/AMP is a single phase silicon controlled rectifier (SCR), power
amplifiers designed to control and regulate AC power. The DPA-1 can be set up to operate in a closed loop or
in an open loop system containing a resistive or inductive load. The output power of the DPA-1 corresponds
linearly to a command signal from an industrial process controller or other similar device. Internal feedback,
within the DPA-1, insures output Voltage regulation. An optional current feedback network provides current
limiting when desires.
1-3.
Numerous other options and accessories are available to adapt the DPA-1 to the individual
requirements of the many different power control systems in use. Most of these options and accessories can
be integrated into (bolted on) the DPA-1 if the need arises after installation. Water cooled heat sinks are
available in the DPA-1, but are physically different, and must be specified at time of order.
1-4.
DPA-1 PHASE/AMP MODELS.
1-5.
There are two basic series of DPA-1 PHASE/AMPS which can operate from either a 50 Hertz or 60
Hertz line. They are the 240 Volt AC and the 480 Volt AC series. However, each series can be rewired, by
changing taps on internal transformers, to accommodate other operating Voltages. For example, the 240 Volt
series can be rewired for 120 or 208 Volts AC. The 240 hookup will suffice for the 220 Volts AC required for
overseas operation. The 480 Volt series can be rewired for 120, 208, 240, 277 or 416 Volts AC. The 416 Volt
hookup will suffice for the 380 Volts AC required for overseas operation. A 600 Volt series is also available
and is covered by this manual.
The DCPA-1 is very similar to a DPA-1 with rectification circuitry at the output. Consequently, all circuit theory
in the manual relates to the DCPA-1 as well as to the DPA-1.
Referring to schematic 05D100260, diodes D15, D16, D17 and D18 make up the bridge rectifier of the DCPA-
1. Thyrector THY2 provides protection against transients. The full-wave rectified dc output appears across
positive terminal X1 and negative terminal X2. All components in this circuit have been selected to provide a
high degree of efficiency; the maximum average dc output from the DCPA-1 consequently approaches 90% of
the rms line Voltage. This virtually perfect rectification efficiency means that the DCPA-1 output Voltage falls
slightly below the theoretical maximum attainable in such a circuit only because the pre-rectification output
Voltage is limited by firing-circuit design restrictions to 97% of the line Voltage.
Refer to DCPA-1 outline and mounting dimension drawing 02C100259 for details on physical placement of
components.
Document 9100030
INFORMATION RELATING TO DCPA-1 MODELS ONLY
AMETEK HDR Power Systems
Description
1
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