37
Analog Error Low
1. The load cell input is below the range of the indicator.
CORRECTIVE ACTION: Check for improper load cell wiring
and for output of 1 to 50mV.
2. Load cell or circuit failure.
CORRECTIVE ACTION: consult your
scale serviceman.
A program checksum mismatch has been detected. CORRECTIVE
ACTION: consult your scale serviceman.
An illegal write to the NOVRAM has been detected.
CORRECTIVE
ACTION: consult your scale serviceman.
Internal RAM failure.
CORRECTIVE ACTION: consult your scale
serviceman.
The RAM test has detected one or more failures in the external 748P
RAM memory.
CORRECTIVE ACTION: consult your scale
serviceman.
No battery-backed RAM. The time and date, zero dead load, DAC
output calibration, and truck file data has been lost. Operation may
proceed by pressing the CLEAR key and re-entering the lost data,
but the data will be lost when power is removed from the instrument. Consult your scale serviceman
to replace the RAM and clock battery-backed IC.
CARE AND CLEANING
1. DO NOT submerge indicator in water, pour or spray water directly on instrument.
2. DO NOT use acetone, thinner, or other volatile solvents for cleaning.
3. DO NOT expose equipment to temperature extremes.
4. DO NOT place equipment in front of heating/cooling vents.
5. DO clean the indicator with a damp, soft cloth and mild non-abrasive detergent.
6. DO remove power before cleaning with a damp cloth.
6. DO provide clean AC power and adequate protection against lightning damage.
6. DO keep the surroundings clear to provide clean and adequate air circulation.
APPENDIX A OPTION BOARD (optional)
This appendix describes the installation of the optional I/O interfaces. This option consists of both a
0 to 10 volt and 4 to 20 MA analog output, a BCD output and eight (8) programmable inputs.
ANALOG OUTPUT
The analog output is a 12-bit (4,096 states) analog representation of the displayed weight.
Connections are made via a terminal block on the back of the option board (see figure no. 9). The
maximum load resistance for the current output is 500 ohms while the minimum load resistance for
the voltage output is 2K ohms. Refer to figure no. 9 for the pin layout for the connector.
PIN NUMBER FUNCTION
1 0 - 10 VDC output
milliampere output 2 4 - 20 Ma output
3 common
figure no. 9 - option board, rear view
8539-C012-1A
9 8 7 6 5 4 3 2 1
3 2 1
COMMON
4-20mA
0-10 V
NOT USED
NOT USED
NOT USED
COMMON
NOT USED
TARE
ZERO
PRINT
GROSS
BCD OUTPUT
ErrAL
Err1
Err2
Err3
Err r
no bbr
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