Unipulse F377A, Руководство по эксплуатации

Страница: 86 / 152

8 SUPPLEMENTS
85
S
U
PPLEMENTS
Chapter
8
8-1.
Error Display List
When either of the following errors occur, the RUN signal of an external output is turned off.
■
e
rror or Sensor -error
This message indicates that the inputted electric signal exceeds the input voltage range of the
element (ADC) which converts the inputted electric signal to a digital value whereby the signal
cannot be converted to a correct digital value.
error and Sensor -error indicate that the inputted electric signal exceeds the input range in
the positive direction and negative direction, respectively.
This message may also be displayed when an excessive load is applied to the sensor or the input
terminals are opened due to a break in the cable.
■
+Over or -Over (Overflow error)
This message indicates that the value to be displayed except the decimal point and sign exceeds five
digits. The message and a value of as much as five digits appear alternately.
+OVER and -OVER indicate that the value to be displayed exceeds five digits in the positive
direction and negative direction, respectively.
This message is displayed in such a case wherein a load larger than expected is applied or
calibration is performed below the measuring range. Check calibration and the measuring object.
■
Overload (Overload error)
An Overload error results when the real time value (sensor input value) exceeds the alarm HI limit
or drops below the alarm LO limit.
Check the sensor for excessive load.
■
Zero error (Zero calibration error)
This message indicates that calibration cannot be performed because the inputted electric signal
exceeds the input voltage range.
Check the cables for breaks or miswiring.
■
Span error (Span calibration error)
The span calibration error occurs under the following conditions.
1) An actual load set value of zero is inputted.
2) An electric signal of -0.1~0.1V or -0.2~0.2mA with the difference
from zero calibration point is inputted.
In the case of 1), check the set value, and perform calibration again.
In the case of 2) , check that the actual load is properly applied and check the cables for
miswiring.If the load is too light, the load needs to be increased.
Although the F377A will not break down immediately even if the above messages are displayed,
error or Sensor -error indicates that an excessive voltage may be applied to the input circuit
of the F377A. It is therefore required to remove the cause immediately.
(Although the input is provided with a protection circuit, a long-time excessive voltage or an
instantaneous but extremely high voltage may break the F377A.)
■
Zero limit (Digital zero limit error)
A zero limit error results when the range of zero-point correction (deviation from the zero
calibration registered point) by digital zero or zero tracking exceeds the Digital Zero Limit set
value.
Reset the digital zero, or perform digital zero in an appropriate range.
8
SUPPLEMENTS