American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 105)

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Service
Troubleshooting Hints
6.2.5 One of the Model 286 channels reads instead of
displaying the level
The display indicates that the input assigned to the
channel has not been fully calibrated. For the input assigned to the
channel, the MAX has been calibrated, but not the MIN. Check to
make sure that the intended input (A, B, C or D) is assigned to the
channel and that the intended calibration selection (1, 2, 3, or 4) is
active. If it is, then the input calibration must be completed — see
the Calibration section beginning on page 17.
6.2.6 One of the Model 286 channels reads instead of
displaying the level
The display indicates that the input assigned to the
channel has not been fully calibrated. For the input assigned to the
channel, the MIN has been calibrated, but not the MAX. Check to
make sure that the intended input (A, B, C or D) is assigned to the
channel and that the intended calibration selection (1, 2, 3, or 4) is
active. If it is, then the input calibration must be completed — see
the Calibration section beginning on page 17.
6.2.7 The Model 286 will not allow an input to be assigned to
channel 2
Channel 2 is unavailable for use in auto-changeover mode and pre-
cool mode. In these two modes, channel 1 is the primary control
channel, and channels 3 and 4 are available for use, but not
channel 2.
6.2.8 Controller output does not energize
Warning
This procedure is to be performed only when the instrument is
completely de-energized by removing the power-cord from the power
receptacle. Failure to do so could result in personnel coming in
contact with high voltages capable of producing life-threatening
electrical shock.
1. Verify continuity of controller output fuses (F2, F3, F4 and F5)
located on the instrument printed circuit board.
a. Ensure the instrument is de-energized by disconnecting the
power cord from the power source. Disconnect the power cord
from the connector located on the rear panel of the instrument.
b. Remove the instrument top cover and check the fuses F2, F3, F4
and F5 for continuity.