Maintenance and trouble shooting
Page 12
4 Maintenance and trouble shooting
4.1 Temperature error codes (item EM)
This item contains the most recent temperature error encountered by the MPU, HPU or OPU board.
Error codes 22xx are from the MPU board, 24xx are from the HPU board and 26xx are from the OPU board.
2x00 No error, value at initialization 2x69 CRC error )
2x50 Element connected to CN2-0 detected absent
2x51 Element connected to CN2-1 detected absent
2x52 Element connected to CN2-2 detected absent
2x53 Element connected to CN2-3 detected absent
2x54 Element connected to CN3-4 detected absent
2x55 Element connected to CN3-5 detected absent
2x56 Element connected to CN3-6 detected absent
2x57 Element connected to CN3-7 detected absent
2x58 Element connected to CN4-8 detected absent
2x59 Element connected to CN4-9 detected absent
2x60 Element connected to CN4-10 detected absent
2x61 Element connected to CN4-11 detected absent
2x62 Element connected to CN5-12 detected absent
2x63 Element connected to CN5-13 detected absent
2x64 Element connected to CN5-14 detected absent
2x65 Element connected to CN5-15 detected absent
2x67 Wrong sequence number in transmitted data;
862 MIT will be reset. )
1
2x68 Overflow bit set in transmitted data. Check thermocouple
wiring connections
) Communication error with 862 MIT; check wiring and
1
grounding between 862 MIT and connected instrument
) Check on too high leak current
2
*) Refer to section 1.3 Measuring sequence
1
2x72 Item RW determined, but not copied into MW
2x73 Syntax error in item MW (compare MW with RW)
2x74 Unable to detect wiring sequence. One or more elements
were detected absent
2x75 General MIT error (R_ref and / or R_gnd failed) *)
2x76 U_
TC0
and / or U_
TC0'
failed *)
2x78 Item MR not set to any value
2x79 Calibration fail; items VR and / or VT not (correct) set
2x80 Ratio R_test / R_ref invalid (should be 0.75) *)
2x81 Ratio U_test / U_ref invalid *)
2x82 R_
TC0
>100 ohm (thermocouple 0 open loop) *)
2x83 330 ohm > R_
TC0'
> 430 ohm. Check if CN1-19 is
unconnected and if item MR has the correct value )
2
2x86 Leak current too large. Check with item VV10,00. This
should be lower than 250 nA. Check grounding of all
cabling to 862 MIT and level gauge.
2x87 R_
TCi
error. Thermo elements possibly not connected in
the right order. *)
2x88 On resistance of one of the FETs is too high. Check if
item MR has the correct value
2x89 Measured thermo voltage of an element is too high
2x90 Floating point calculation failure (on processor board)
2x92 No communication with MIT during last 10 seconds.
Check cabling between 862 MIT and connected
instrument.
If one element is detected absent it could very well mean that the thermocouple wiring to the 862 MIT is not
correct connected or the FET switch in the 862 MIT is not correct working.
4.2 Temperature status request (item MQ)
Four bytes status information (B0 B1 B2 B3) with the following meaning:
Status byte 0:
Contains the characters ‘0’ ÷ ‘F’, indicating the highest immersed spot element of the MTT. At start up: ’I‘.
Status byte 1: Status byte 2:
bit 0 : General temperature fail bit 0 : Last valid level used
1 : Fail in average product temperature 1 : Manual level used
2 : Fail in average gas temperature 2 : Level time out
3 : Level exceeds lowest spot element 3 : Device not calibrated
4 : Level exceeds highest spot element 4 : Exceeding differential temp. range
5 : Spot element fail (one or more spots defect) 5 : Out of specified temperature range
6 : 1 6 : 1
7 : 0 7 : 0
Status byte 3: For decoding of the status bytes, refer to the
bit 0 : No previous store command ASCII table in appendix A.
1÷5 : 0
6 : 1
7 : 0
To Next Page
Loading...