GETTING STARTED MANUAL REVISION 2.0
21
Trouble Shooting Quick Reference Sheet
(A complete trouble shooting guide is available from our web site)
PROBLEM POTENTIAL SOLUTION
A sensor input reads -99.9 This indicates an open sensor input signal or 5 VDC problem.
Check sensor wiring for missing wire or poor connection.
Check sensor for bad sensor.
If less than 5 VDC is on the sensor 5 VDC terminal block, the problem is with
probably a shorted sensor. (A poly fuse protects the board)
Remove all sensor input terminals.
Wait about 1 min. or until 5 VDC restored at sensor input.
Connect terminals 1 at time until short reappears.
A sensor input reads +999.9 This indicates a shorted sensor input signal.
Check sensor wiring for +5VDC shorted to signal etc.
Check sensor for bad sensor.
A sensor is reading less then or
greater than 3% off
This indicates the sensor needs to be calibrated. (You need to have a valid
Authorization code to change sensor offsets)
Press Service Diagnostics, press until LCD display s sensor offset option
Press enter, 1st SI# and offset appears (i.e. Suction 1 = 0.0)
Scroll using “increase (+)/decrease (-)” keys to find sensor to be calibrated
Press enter, use the “increase (+)/decrease (-)” keys to change the calibration
value. When value is correct, press enter.
LCD blank or flashing. Indicates bad connection.
Check wiring to keypad
Could indicate bad software transfer, retransmitting may be necessary.
Lost I/O Indicates communications problem.
Verify RS485 LED blinking.
Verify termination jumper only on JP4 on the MCS-Magnum and the last I/O
board.
Verify MCS-Magnum and each I/O’s address is set correctly.
Verify wiring from the MCS-Magnum to each I/O is correct.
Check fuses/120 VAC on I/O units
Invalid reading on one sensor
input.
This indicates an input problem with 1 sensor.
Verify jumper settings correct for that SI.
Invalid authorization This indicates an invalid authorization number.
Follow steps below for proper authorization
Press SERVICE DIAGNOSTICS until the auth. option appears
Press the ENTER key
From the “Display Status” press keys corresponding to your authorization #
Press ENTER
(1 pages)
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