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4.5.5 Switch Feedback Control to a Second Feedback Source
The feedback source can be easily switched between two feedback sources by
writing to variable 87 (ID_EXT_FEEDBACK_SOURCE) in the ER3000. This
may be quite beneficial if trying to control at two very different pressures, e.g.
80 psi and 8000 psi. Transducer 1 could be a 10,000 psi transducer and
Transducer 2 could be a 100 psi transducer.
This feature is only available on ER3000 models that have the extra analog
inputs, as referenced in Section 3 (ER3000 Model Description).
Figure 15: Switch between two External Feedback Sources
NOTE: Wire power as shown in figures 2 & 3
4.5.6 Monitor Analog Signals
The ER3000 can monitor a number of analog signals. This is quite useful in data
acquisition systems to perform trend analysis on the system. Figure 15 shows
two transducers (e.g. with outputs P1 and P2) that can be continuously
monitored by a PC program. All of the ER3000 models can monitor two analog
signals, the analog setpoint and external feedback. Some ER3000 series models,
as referenced in Section 3 (ER3000 Model Description), can monitor two
additional analog signals; the extra input 1 and extra input 2 signals.
Monitoring Extra Input 2 does necessitate the knowledge that this input doubles
as the Profile Start/Stop input. The toggle level of Extra Input 2 should be set to
its maximum value, 4095, if you do not want the pressure profile to start running.
This is simply done by adjusting variable 86 (ID_AD_EXTRA2_TOGGLE)
described in section 9.5 (Analog Input Variables).
24 ER3000 User Manual
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