KROHNE IFC 020 Converter EN - Manual (Page 24)

Installation and operating instructions IFC 020 4/5
π
4
π
4
Q actual flowrate
Q
100%
100% flow = full scale range
Q
max
= DN 2 x v
max
/ max. full-scale range (Q
100%
)
at v
max
= 12 m/s / 40 ft/s
Q
min
= DN 2 x v
min
/ min. full-scale range (Q
100%
)
at v
min
= 0.3 m/s / 1 ft/s
S Status output
SMU Low-flow cutoff for I and P
v Flow velocity
v
max
Max. flow velocity (12 m/s / 40 ft/s) at Q
100%
v
min
Min. flow velocity (0.3 m/s / 1 ft/s) at Q
100%
F/R Forward/Reverse flow at F/R operation
π
4
4.4 Table of settable functions
Abbreviations used
C Control input (IFC 020 E only)
DN Nominal size, meter size
F
max
Highest frequency of pulse output
F
min
Lowest frequency of pulse output
F
M
Conversion factor volume for any unit,
see Fct. “FACT. VOL.”
F
T
Conversion factor time for any unit,
see Fct. 3.05 “FACT. Time”
GK Primary constant
I Current output
I
0%
Current at 0% flow
I
100%
Current at 100% flow
P Pulse output
P
max
= F
max
/ Q
100%
P
min
= F
min
/ Q
100%
π
4
Fct. Text Description and settings
1.00 OPERATION Operations menu
1.01 FULL SCALE Full-scale range for flowrate Q
100%
Select unit
• m 3 /hr • Liter/Sec • US.Gal/min
• user unit, factory set is “Liter/hr” or “US MGal/day” (see Fct. 3.05)
Press → key to transfer to number setting.
Setting ranges
The ranges are dependent on the meter size (DN) and the flow
velocity (v): Q
min
= DN 2 x v
min
Q
max
= DN 2 x v
max
Nom. dia./meter size v
min
= 0,3 m/s (1 ft/s) v
max
= 12 m/s (40 ft/s)
• DN 2.5–1000 / 1 / 10 ”–40”: 0.0053 – 0 33 900 m 3 /hr
0.0237 – 152 000 US.Gal/min
Press ↵ key to return to Fct. 1.01 FULL SCALE.
→ VALUE P Pulse value (Fct. 1.06 “VALUE P”) has been changed.
With the “old” pulse values the output frequency (F)
would have been exceeded or not reached.
P
min
= F
min
/ Q
100%
P
max
= F
max
/ Q
100%
Check new values!
1.02 TIMECONST. Time constant
Select: • ALL (applies to display and all outputs)
• ONLY I+S (only display, current and status outputs)
Press ↵ key to transfer to number setting.
Range: • 0.2 – 99.9 Sec
Press ↵ key to return to Fct. 1.02 TIMECONST.
1.03 L.F.CUTOFF Low-flow cutoff (SMU)
• OFF (fixed values: ON = 0.1% / OFF = 0.2%
at 100Hz and 1000Hz, see Fct. 106, 1% resp. 2%)
• PERCENT (variable values) ON OFF
1 – 19% 2 – 20%
Press → key to transfer to number setting.
Note: Cutoff “off” value must be greater than cutoff “on” value.
Press ↵ key to return to Fct. 1.03 L.F. CUTOFF.