YOKOGAWA TB400G-A1 Series, User Manual, Page: 61 / 140

<5. FUNCTIONS>
5-2
IM 12E04A02-02E
Table 5.1 Failure Detection Function
Detected item Details
Generation
mode
Error
No.
FAIL
lamp
Detection on/
off setting
Mode FUNC-
TION
1) Turbidity
overrange
This is detected if the measurement signal from
the detector is out of the permissible range is
approx. +0.5 V to -2.45 V across S1 and AG
terminals in the converter.
MEAS. Err11
○
PRO-
GRAM 2
1.
2) Lamp
disconnection
This is detected if the lamp goes off and the
reference signal drops to approximately -0.5 V or
less.
MEAS. Err12
○
PRO-
GRAM 2
2.
3) Lamp voltage
failure
This is detected if the lamp voltage is out of the
permissible range. The permissible range is
approximately 3 V to 6 V across terminals P1 and
P2 in the converter.
MEAS. Err13
○
PRO-
GRAM 2
3.
4) AD circuit
failure
1. Detected if analog-to-digital conversion is not
completed in the predetermined time.
2. If the converted data are out of the permissible
range, this is detected if the input is swiched to
a simulated input and the converted data are
again out of range.
All modes Err14
○
PRO-
GRAM 2
4.
5) Memory
comparison
failure
Data such as setpoints are stored in two places
in the EEPROM. This is detected if the results of
regular comparisons of such data do not agree.
All modes Err15
○
PRO-
GRAM 2
5.
6) RAM failure
Detected if the result of a comparison of speci fi ed
data in writing and reading immediately after
turning on power does not agree. If detected,
subsequent operations cannot be accepted.
When
power is
turned on
Err16
○
7) EEPROM
failure
Immediately after turning on power, the data
stored in two places in the EEPROM are
compared. If they do not agree, this item
is detected if the result of the comparion of
speci fi ed data in writing and reading does not
agree. If detected, subsequent operations cannot
be accepted.
When
power is
turned on
Err17
○
8) Reference
signal voltage
failure
If the reference signal from the detector is out of
the permissible range, this item is detected. The
permissible range is approxi0.5 V to
-2.45 V across terminals S2 and AG.
MEAS. Err18
○
PRO-
GRAM 2
6.
9) Zerocalibration
range
exceeded
Detected when the input value in zero calibration
is out of the permissible range. The permissible
range is ±10 mV.
When
calibration is
carried out
Err21 ×
10) Span
calibration
range exceed
Detected if the input value in span calibration is
out of the permissible range. For span calibration
(standard solution reference), the permissible
range is 50 to 400 %.
For span calibration (sensitivity correction), the
permissible range is 0.25 to 400.
For details, see section 5.3 (*3).
When
calibration is
carried out Err22 ×
11) Zero-shift
calibration
range exceed
Detected if the zero-correction coef fi cient in
zeroshift calibration is out of the permissible
range.
The permissible range is ±9 mg/l.
When
calibration is
carried out
Err23 ×
12) Calibration
plate failure
Detected if the input value in span calibration is
out of the permissible range. The permissible
range is ±50 % of the calibration plate setpoint.
When
calibration is
carried out
Err24 ×
13) Lamp life *1
Detected of the lamp voltage reaches the upper
control limit. The upper limit is approx. 4.8 V *4
across terminals P1 and P2.
MEAS. Err25
○
PRO-
GRAM 2
7.
14) Failure in
automatic
zero
calibration *2
Detected if the zero input value in automatic zero
calibration is out of the permissible range. The
permissible range is ±10 mV.
MEAS. Err26
○
PRO-
GRAM 2
8.
15) High and low
alarm *3
Detected if the turbidity signal exceeds the upper
or lower limit setpoint. When shipped from the
factory, these are set at -10 (lower) and 2200
(upper) mg/l.
MEAS.
"MEAS."
fl ashes.
×
PRO-
GRAM 2
9.
16) CPU failure CPU failure. Normally this does not occur. All modes
Only the "FAIL" lamp is lit and no
operations are accepted.
3rd Edition : May. 31, 2010-00