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Phase/AMP Series DPA1/DCPA1
SECTION V -TROUBLE SHOOTING
5-1.
APPROACH TO TROUBLE SHOOTING.
5-2.
This section is arranged in two parts.
designed to solve those problems which are most likely to occur.
Shooting," is used as a follow up procedure in the event that the trouble is not eliminated by the first part of this
section, or as an alternate procedure when trouble symptoms are other than "typical".
5-3.
TROUBLE SHOOTING TYPICAL SYMPTOMS.
5-4.
The DPA-1 is considered to be operating properly when its output Voltage can be satisfactorily varied
from 0% to 97% of the input Voltage, by a control signal. Improper operation of the unit is usually indicated by
one of the following symptoms:
a. No output. (If this symptom exists, always check the DPA-1 input line fuse, with power off, before
considering other causes. Refer to Table 5-1 for replacement fuse numbers.)
b. Full output at all times, with no change resulting from a control signal change.
c. Output controllable over partial range only – either from 0% to 50%, or from 50% to 97% (of input Voltage)
as measured with a typical VOM.
The symptoms listed may be caused by one or more of the following: an environmental problem; faulty input
power or load connections; load problems or process controller problems; and the DPA-1 unit itself. These
possible causes should be investigated in the order given, and as described in paragraphs 5-5 through 5-16.
5-5.
ENVIRONMENTAL PROBLEMS
5-6.
Check to see that none of the following environmental problems exist. If a problem does exist, steps
should be taken to correct it.
a. Inadequate cooling. There should be at least one inch of air space (in any direction) between the heat sink
and any item or structure, near the DPA-1 Convection cooled units must be oriented so that the main
structural ribs and cooling fins of the heat sinks are vertical with respect to the horizontal plane. Heat sink
fins should be free of dust or dirt for proper heat transfer, and free of obstructions which could prevent
proper air flow.
b. Contamination. The unit should be periodically cleaned of all dust and dirt. However, certain kinds of dust
or particles are particularly conductive. A small accumulation of conductive material in a short period of
time can cause component failures from arc-over or complete shorts.
c. High Ambient Temperature.
subsequent increase in ambient temperature, can result in numerous DPA-1 problems.
ambient temperature under existing conditions. If it is 122° F or 50°C or lower, ambient temperature
should not be considered as the cause of any existing problems. If above 122°F or 50°C steps must be
taken to provide more cooling, or the DPA-1 should be moved to a cooler location.
If full power output is not required, higher ambient temperature can be tolerated. For each 5%
reduction of output current (from 100% max.), the allowable ambient temperature can be
increased 1°C (from 50°C) to a maximum of 70°C.
Document 9100030
The first part , "Trouble Shooting Typical Symptoms," is
Lack of a proper ambient temperature check before installation, or a
NOTE
AMETEK HDR Power Systems
Trouble Shooting
The second part, "General Trouble-
Check the
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Table of Contents
Troubleshooting
