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Installation
2-11.
RADIO FREQUENCY INTERFERENCE.
2-12.
The possibility of generating radio frequency interference (RFI) exists when the DPA-1 PHASE/AMP is
used to drive a purely resistive load. If the RFI is radiated to an objectionable degree by the power lines, the
steps listed below will substantially attenuate the RFI.
a.
The DPA-1 PHASE/AMP must be enclosed in an RFI shield enclosure.
b.
All output lines should be shielded and the shield jackets connected to the DPA-1 enclosure.
c.
RFI filters should be installed from each input line to earth ground.
d.
Additional RFI suppression is afforded by inserting a power factor correction capacitor near the DPA-1
power line input.
While the above steps are suitable for attenuation of high frequency RFI, the low frequency component that
results from excessively "slack" power lines can only be attenuated by employing a "stiff" or less inductive
power source. RFI will probably not be a problem if the load is transformer coupled. If the load is driven
directly without the intervening transformer, consider the use of zero fired equipment, Series LZF-1.
2-13.
MOUNTING
2-14.
The only physical restrictions to be considered when mounting the DPA-2 PHASE/AMPS are listed
below.
a. If the unit is convection cooled, it is preferable to mount the unit with the fins of the heat sinks vertical with
respect to the ground plane.
b. At least one inch, and preferably two inches of air space should be allowed in all directions from the heat
sinks.
2-15.
GENERAL.
2-16.
The fuses installed in the DPA-1 PHASE/AMP are selected to open with a current surge. The fuses
will NOT protect against a long term overload. If such operation is anticipated, a circuit breaker should be
installed to protect the SCR's. The output current of the DPA-1 should never exceed 125 percent of the rated
value.
2-17.
WIRING AND INITIAL START-UP.
2-18.
Prior to placing the DPA-1 PHASE/AMP on-line, perform the wiring and initial start-up procedures
outlined below.
The heat sinks are well above ground. Power should never be applied to the unit when the
possibility of touching or grounding the heat sinks exists. Hazardous Voltages are present on
the large, finned heat sinks and at most of the exposed terminals. Always remove electrical
power from the unit before installing, removing, or performing service (replacing fuses, etc.) on
the unit.
8
WARNING
AMETEK HDR Power Systems
Phase/AMP Series DPA1/DCPA1
Document 9100030
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Troubleshooting
