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Phase/AMP Series DPA1/DCPA1
a. Turn off power to DPA-1. Disconnect load and process controller at the DPA-1.
b. Connect a dummy load to the DPA-1 which will draw approximately one ampere at full output Voltage.
(Example: on a 480-Volt unit, use four 100-watt bulbs connected in series.)
c. Connect a Voltmeter (Simpson 260 or equivalent) across the output terminals.
d. Make a light pencil mark at the pointer of the BIAS/MAN knob so that it can be reset to the same position.
e. Set BIAS/MAN pointer at "0" (top center). Turn on input power to the DPA-1. The Voltmeter reading
should be zero; if not, adjust BIAS/MAN slightly CW to CCW to obtain zero meter reading.
f.
Observe the Voltmeter; slowly move the BIAS/MAN control clockwise (CW) to "MAN MAX." Confirm that
the output Voltage increases smoothly as the control is rotated, and is approximately 97% of the input Voltage
when the control is fully CW.
g. If the conditions in step e and f are met the trouble is in either the DPA-1 load or the process controller;
continue at step h. If the conditions in step e and f are not met; retain the test setup and refer to paragraph 5-
11.
h. Turn off power to the DPA-1. Retain test setup.
i.
Thoroughly check out the normal load supplied by the DPA-1. Look for intermittent or "fixed" opens or
shorts, etc., and correct any problems found. If the load appears satisfactory, proceed with step j.
j.
Reconnect the process controller input to DPA-1 terminals TB1-2 (+) and TB1-1 (-). (The dummy load
should still be connected to the DPA-1.) Check out the process controller by repeating only steps k through q
of paragraph 2-18. If the process controller does not perform satisfactorily trouble shoot as stated in
manufacturer's handbook.
k. When load or controller problems have been corrected, reconnect all equipment for normal operation.
Return BIAS/MAN pointer to mark made in step d, or repeat steps k through q of paragraph 2-18.
5-11.
CORRECTING TYPICAL DPA-1 TROUBLE SYMPTOMS.
5-12.
Perform test setup and procedure given in paragraph 5-10, steps a through f, if not already
accomplished. Repeat steps e and f as necessary to determine which, if any, of the following typical trouble
symptoms exists, and refer to appropriate paragraph for instructions.
Constant full output, no control
Output controllable from 0% to 50% only*
Output controllable from 50 to 97% only *
5-13.
No output.
a. Check fuse F1. If fuse is bad, replace fuse with type specified in Table 5-1.
b. Check for proper firing pulses to power SCR's as described in paragraphs 5-26 and 5-27. If the proper
firing pulses are not present, proceed with the general trouble shooting procedures, paragraph 5-17.
5-14.
Constant Full Output, No Control.
a. Check power SCR's Q1 and Q2 for anode to cathode short.
Document 9100030
SYMPTOM
No Output
AMETEK HDR Power Systems
INSTRUCTIONS
5-13
5-14
5-15
5-16
Trouble Shooting
33
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Table of Contents
Troubleshooting
