2 self-diagnostics functions, Self-diagnostics functions -4 – Yokogawa ADMAG CA User Manual

Page 69

IM 1E8B0-01E

8-4

8. ACTUAL OPERATION

8.2 Self-diagnostics Functions

• The self-diagnostic function displays instrument internal errors, input/output signal

abnormalities, setting errors, and other problems.

• When an alarm occurs, an alarm number announcing that an error has occurred is

superimposed on the normal data display.

However, alarms are only displayed during normal flow rate data display mode and

when parameter numbers are changed in the setting mode. (Alarms are not displayed
when data items are being changed.)

• When the BT200 is used, alarms are displayed in the A to N60 SELF CHECK

parameter. If an error is detected and ERROR appears in the display, investigate the
nature of the error.

8.2.1 Display and Output Status during Alarm occurrence

• If an error occurs, the

panel display LED
flashes and an alarm
number is superimposed
on the normal display.
During this time the
current output is fixed to
2.4mA max., 4mA,
HOLD or 21.6mA max.,
as selected in 4-20 ALM
OUT (output current
during alarm).

• An alarm (status contact

output) is output for any
of the errors indicated in
the table at right.

Note : As selected in 4-20 ALM OUT (output current during alarm)

LED

Contact

output

Current

output

Totaliza-

tion pulse

Display

Display on BT

GOOD

ERROR

P FAULT

EEPROM FAULT

A/D(H) FAULT

A/D(L) FAULT

SIGNAL OVERFLOW

COIL OPEN

VEL. SAPN>10m/s

VEL. SPAN<0.3m/s

P.SPAN>1000p/s

P.SPAN>500m/s

P.SPAN>25p/s

P.SPAN>15p/s

P.SPAN>10p/s

P.SPAN>5p/s

P.SPAN<0.0001p/s

T.SPAN>1000p/s

T.SPAN<0.0001p/s

4-20 LMT ERROR

OFF

Normally Normally

Flash-

ing

OFF

Fixed

(See

note.)

Stops