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Phase/AMP Series DPA1/DCPA1
h. Connect an AC Voltmeter across the load, terminals X1 and X1 on the unit. A Simpson 260 multimeter or
equivalent may be used for this purpose.
i.
Position the BIAS/MANUAL control to "0". See figure 2-1.
j.
Rotate the GAIN control fully counter clockwise to "MIN". See figure 2-1.
k. Turn on main power.
l.
Set the process controller to demand maximum power.
m. Slowly adjust the GAIN control clockwise until the AC Voltmeter (connected in step h) indicates 95 percent
of the input Voltage, across the load.
n. While observing the DC milliammeter (connected in steps e through g), reduce the set-point of the process
controller to minimum output current. For example, 4 mA from a 4 to 20 mA controller, 0 mA from a 0 to 5
mA controller, etc.
o. Slowly adjust the BIAS/MANUAL control counter clockwise until the AC Voltmeter indicates 0 (zero) Volts
across the load.
p. Repeat steps 1 through o.
q. Turn off main power.
r.
Disconnect the AC Voltmeter and the DC milliammeter from the unit.
s. Connect the negative (-) lead of the process controller to terminal 1 on terminal strip TB1.
For proper operation of the DPA-1 PHASE/AMP, proper polarity of the control signal from
the process controller must be observed.
t.
Disconnect the dummy load (connected in step c) from terminals X1 and X2 on the unit.
u. Connect the actual operating load to terminals X1 and X2 on the unit.
If the Current Transformer (option D) or the Power Feedback, Current Limit, and Current
Transformer (option Q) is being used, pass the load line to be connected to terminal X1
through the Current Transformer. See Figure 2-1.
v. If the unit does not have the Current Limit (option A), the set up is complete. Turn on main power to the
unit and set process controller to desired set-point and commence operation.
w. If the unit does have the Current Limit option, proceed as follows:
(1) Position the CURRENT LIMIT control, on the Control Limit Module, to the center line or mid
position.
(2) Turn on main power.
(3) Adjust the process controller to demand full power.
Document 9100030
NOTE
NOTE
AMETEK HDR Power Systems
Installation
11
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Troubleshooting
