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Phase/AMP Series DPA1/DCPA1
SECTION III - OPERATION
3-1.
GENERAL.
3-2.
All of the controls, indicators, and devices required to control the operation and display parameters of
the system are located on the PHASE/AMP. For purposes of discussion, the controls, indicators, and devices
are divided into two categories, standard and optional.
3-3.
STANDARD CONTROLS.
3-4.
All PHASE/AMPS have a GAIN control and a BIAS/MANUAL control. The operation of the GAIN
control is discussed in paragraph 3-5 and the operation of the BIAS/MANUAL control is discussed in
paragraph 3-9.
3-5.
GAIN CONTROL.
3-7.
The GAIN control is located on the Firing Circuit Module. The function of the control is to match the
output span of the process controller to the output power delivered to the load by the PHASE/AMP. Thus, a
controller having a span of 0 to 2 milliamperes can, by power adjustment of the GAIN control, result in 0 to 100
percent power output from the unit.
milliamperes, or any span where the upper limit does not exceed 50 milliamperes, may be matched to provide
full continuous tracking of output power from the PHASE/AMP.
3-7.
If the controller has a rated output span of 0 to 15 milliamperes, but the GAIN control is adjusted to
produce 100 percent output power at 10 milliamperes, the effective output span of the controller is 10
milliamperes. Figure 3-1 shows the relationship between the desired effective controller output span, GAIN
control setting, and power output span of the PHASE/AMP.
Figure 3-1 Relationship Between Effective Controller Output Span, GAIN Control Setting,
and PHASE/AMP Output Power Span.
3-8.
If, for example, an effective controller output span of 0 to 10 milliamperes is desired, the GAIN control
is set to produce full power output when the controller output is 10 milliamperes. If the GAIN control is set high,
the PHASE/AMP will be driven to deliver full output power to the load at some point before the controller output
is 10 milliamperes. This will result in a reduced proportional band and potentially unstable operation of the
control system. If the GAIN control is set low, full output of the PHASE/AMP will never be delivered to the
load.
Document 9100030
Similarly, controllers with spans of 0 to 5 milliamperes, 0 to 10
AMETEK HDR Power Systems
Operation
15
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