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IM 1F6A0-01E
7-2
7. MAINTENANCE
7.1.5 Unit of Pulse Output (Scaling)
Pulse output are constructed by two units, that are “Scaled
pulse and Unscaled Pulse”.
(1) Scaled Pulse
Scaled pulse output can be done by flowrate units at 1 pulse.
For example, m
3
/p, l/p and so on.
(2) Unscaled Pulse
The numbers of pulses are output by using vortex number
which caused by shedder bar.
Refer to “8.2: Flow calculation”.
䊉
Pulse Rate setting
Pulse rate setting are settable by “B21:PULSE RATE”.
7.1.6 Setting the CPU Error Burnout
Change-over Switch
The Vortex flowmeter is equipped with a CPU error burnout
function used to set the output direction upon CPU error, and
a sensor burnout function that sets the direction of the output
in the event of burnout of the temperature sensor. When
factory-shipment under normal conditions, the output of both
CPU error burnout and sensor burnout are set to HIGH, but if
suffix code/C1 is specified, the CPU error burnout is set to
LOW(-2.5% below) output, and sensor burnout is set to
LOW(-2.5% below) output, respectively. The setting of the
direction of output from burnout can be changed.
To change the direction of output arising from burnout,
switch the setting pin on the CPU assembly (see Table 7.1).
To change the direction of output arising out of sensor
burnout, a dedicated hand-held terminal is required to rewrite
the parameters within the transmitter. For details, refer to the
instruction manual, “IM 1F6A0-01E”.
Table 7.1
Output Direction Setting Pins for CPU Error
Burnout
Pin
position
CPU error
burnout
direction
CPU error
burnout
output
Remark
110% or more
(21.6mA DC)
-2.5% or less
(3.6mA DC)
Set to HIGH upon
shipment from
the factory.
Set to LOW when
suffix code / C1 is
provided.
T070101.EPS
HIGH
LOW
H
L
H
L
TP2
COM
HHT
P
F070102.EPS
Pin position
7.1.7 Power Failure
When a power failure occurs, the totalized value will be
protected by EEPROM (Electrically Erasable Programmable
ROM). But during a power failure, the vortex flowmeter
stops and also the totalizing will stop.
After a power is recovered, the vortex flowmeter and the
totalizing start to work automatically.
EEPROM doesn’t need a battery for backup.