10. Troubleshooting 57
♦ If the port is in use by another application then the error
message “Unable to open COM2” will appear. That port
will have to be freed up before it can be used by the
ER3000 software.
♦ If a connection box does appear, check the LED indicators
on the ER3000
For DOS
This procedure assumes:
- The Tescom “ER3000 User Software” CD, DOS install has been installed
- The communications hardware is configured, as shown in Figure 2.
- The test above, “Power-up Test of the ER3000, using LED Indicators”,
works.
• Run ERTALK by Typing: “\tescom2\tescom 1” at a DOS prompt (i.e. C:\>).
• Type in the node address (250 if unknown).
• Select “1” to “Read ER-3000”.
• Type “44” for parameter index, any parameter works.
• If “Node x : Variable Number 44 = ...” scrolls on the screen, communication
to the ER3000 is working. Otherwise, “Error” is scrolling, LET IT
SCROLL.
If unable to resolve the problem, contact your local distributor. A list of Tescom
distributors may be found on our website, www.tescom.com, or by contacting the
factory.
10.5 Pressure Control Problems
If there is a problem with controlling the pressure:
• Check for pneumatic connections: the inlet pressure (max:120 psig)
must go into the inlet port (marked “IN” on the unit). The gauge port
must be plugged if gauge not installed.
• Check the control mode and setpoint source using the provided software.
• Check the values of the PID parameters using the provided software.
• Check the unit’s calibration: see the Calibration Section for details.
10.6 Acceptable Resistance Values
The resistance values must be measured with all external wiring disconnected,
including the power. Ensure converter screw terminals are tight.
10.6.1 ER3000 RS485 Interface
•
+RS485 to GND = 10KΩ to 50KΩ
• -RS485 to GND = 10KΩ to 50KΩ
10.6.2 Converter RS485 Interface
• +RS485 to GND = 3K to 5KΩ
• -RS485 to GND = 900Ω to 1.2KΩ
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