Azbil Micro Flow MQV0005, Руководство пользователя

Страница: 61 / 90

5-15
Chapter 5. ADVANCED OPERATION
*11. This can be set only when "11: Cumulative flow event" has been selected as event output type
in
c- 07
or
c- 08
in the function setup or when "1: Function enabled" has been selected for
the automatic valve shut-off function upon occurrence of the cumulative flow event (
c- 13
).
*12. This can be set only when "1: Function enabled" has been selected for the
c- 29
forced PV
zero function in the function setup.
*13. This can be set only if suitable limit type is selected for the
c- 35
SP limit function in the func-
tion setup.
*14. The initial value and setting range are the full scale value multiplied by the ratio in parenthe-
ses. (The setting range differs according to model number and gas type.)
Handling Precautions
•
The valve amperage changes greatly according to the differential
pressure even if the flow rate is the same. For this reason, the
valve amperage alarm function cannot be used under unstable
differential pressure conditions.
•
Even under stable differential pressure conditions, hysteresis
characteristics (electric current to the valve differs even if the
flow rate is the same) are applied to the relationship between the
valve amperage and the flow rate. So, to use the valve amperage
alarm function, first sufficiently test under operating conditions to
check the valve amperage range, and then determine the alarm
amperage setting.