FloBoss 407 Instruction Manual
2-26
Rev 5/00
If the old battery was too weak to power the clock (the STATUS LED blinks when power is applied),
you need to reset the clock and reload the configuration. Refer to Section 2.5.3.
2.5.8 Calibrating the Boa rd Temperature Input
The board temperature input (diagnostic analog input E5) normally does not need to be calibrated. If
you want to calibrate it, consult the factory.
2.5.9 Testing the Built-in Analog Input Channels
Equipment Required:
Multimeter
1K ohm resistor
0-5K ohm potentiometer
Personal computer with ROCLINK software installed
If a built-in analog input does not function correctly, first determine if problem is with the field device
or the FloBoss 407 I/O circuitry.
1.
Disconnect the I/O terminal block to isolate the field device from the FloBoss 407 I/O.
2.
If the FloBoss 407 provides loop power source, measure the voltage between terminal “+T”
and “-” of the AI channel under test. The loop power should be 23 volts dc minimum with
jumper P15 in the 24V position (W1 open in older units), or near to input power voltage
with jumper P15 in the 12V position (W1 installed).
3.
Disconnect the battery terminal block. With an ohmmeter check between terminals “+T”
and “-” of the AI channel under test. If 0 ohms, the input has a shorted diode.
4.
With an ohmmeter, check between terminals “+” and “-” of the AI channel under test. If 0
ohms, the input has shorted components.
5.
Replace the termination board if the above tests indicate a fault. Refer to Section 2.5.10.
6.
Connect a lead of a 250 ohm resistor and a 5K ohm potentiometer to the “+” terminal of the
AI channel. Connect the other resistor lead to terminal “-” and the potentiometer to terminal
“+T” of the AI channel under test.
7.
Connect the FloBoss 407 to a computer running the ROCLINK configuration software.
Power up the FloBoss 407.
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