1.
Before teaching in the EDIT mode, select the desired switching function
(threshold value or window comparator)
è
chapter 5.4. EDIT mode.
Threshold comparator
Window comparator
The (taught) switching point is derived from
the average value of both measurement values
SP = 1/2 (Flow 1 + Flow 2)
Special case: SP = Flow 1 = Flow 2
The taught switching window is derived from
the measurement values:
SP.Lo = Flow 1
SP.Hi = Flow 2
Fig.19
For teaching the switching variables:
2.
Generate a flow (Flow 1)
3.
First press the A button and then also the Edit button.
[Out A] and bar display flash and the measurement value is taken over as the
first Teach point or [Lock] flashes if security blocking is active.
Only with active security blocking [Lock]:
4.
Press the A/B buttons until the chosen security code is set.
5.
Press the Edit button.
[Out A] and the bar display flash and the measurement value is taken over as
the first Teach point.
6.
Generate a second flow (Flow 2)
7.
First press the A button and then also the Edit button.
The second Teach point is taken over and the switching point (SP) or
switching points (SP.Lo and SP.Hi) become valid.
The SFAB is in the RUN mode.
5.6 RECORDER mode
Fig.20
In the RECORDER mode, a manual accumulated air consumption measurement can
be performed.
1.
Press the A button and B button at the same time.
The SFAB is in the RECORDER mode.
The status of the air consumption measurement [Run] or [Stop] is displayed.
2.
If [Stop] is displayed, press the A button.
[Run] with a running light is displayed. The air consumption measurement is
started.
3.
Press the A button again.
[Stop] is displayed. The air consumption measurement is stopped.
4.
Press the A button and B button at the same time.
The SFAB is in the RUN mode.
Note
If the RECORDER mode is left during an ongoing air consumption measurement
[Run], the air consumption measurement will continue in the background.
Resetting measurement value to zero.
· Press the B button in the RECORDER mode to reset a measurement value to
zero.
6
Operation
Important:
Excessive internal heat will destroy the SFAB.
· Avoid high cycle frequencies with large pressure amplitudes. Otherwise, the
admissible limit temperatures of the used materials will be exceeded.
The air mass stream displayed by the SFAB refers to the standard conditions that
were set under Options in the special menu.
When comparing volume flows:
· Make sure that the volume flows to be compared (e.g.operating volume flow,
amount supplied by a compressor, measured values of a flow sensor from
another manufacturer) refer to the same basic conditions.
· After the power supply is switched on, the SFAB needs a warm−up time of
5 minutes until it achieves the specified accuracy.
6.1 Resetting the SFAB to the factory settings
(also if the security code cannot be found)
Note
The current settings will be lost after a reset to the factory setting. If necessary,
make a note of these settings before a reset.
To reset the SFAB to factory setting, proceed as follows:
1.
switch off the operating voltage
2.
Press all three setting elements (A button + B button + Edit button)
simultaneously and hold them down.
3.
Switch the operating voltage back on.
The SFAB is in the RUN mode.
7
Care and maintenance
· Switch off the following sources of energy before cleaning the exterior of the
device:
the operating voltage
the compressed air supply.
· If necessary, clean the exterior of the SFAB.
Permitted cleaning agents are soap suds (max. +60 °C), petroleum ether and all
non−abrasive agents.
8
Dismantling
1.
Switch off the following sources of energy before
dismantling:
operating voltage
compressed air.
2.
Disconnect the respective connections from
the SFAB.
3.
In the case of hat rail or wall fitting, remove
the SFAB as shown here.
4.
With plate fitting: Loosen the two fastening
screws.
Fig.21
9
Eliminating faults
Fault
Possible cause
Remedy
Incorrect measurement
display
SFAB operated with
non−permitted medium
Operate SFAB only with
permitted media
display
SFAB contaminated
Replace device
With flow measurement:
Measured value is
Measurement outside permitted
measuring range
Accuracy refers only to the
permitted measuring range
Measured value is
displayed flashing
Incorrect flow direction
Correct the tubing
è
chapter 4.2
With air consumption
measurement:
Measured value is
displayed flashing
Measuring range end value is
exceeded at least once. Specified
accuracy cannot therefore be
maintained.
Make sure that the measurement
range limit value is not exceeded
Outputs do not switch
according to the setting.
Short circuit/overload at relevant
output
Eliminate short circuit/overload
Settings cannot be
edited (Lock)
Access protection active
Enter the security code
O.FLO
Measurement range exceeded
(is displayed in the RUN mode)
Check operating conditions
Er1, Er2, Er3
Device defective
Replace device
Er9
Measurement range fallen below
(is displayed in the RUN mode)
Check operating conditions
Er10
Measurement range exceeded
(is displayed in the RUN mode)
Check operating conditions
Er17
Undervoltage
Maintain operating voltage
g
Check electrical wiring
Fig.22
10
Accessory
Select the appropriate accessories from our catalogue.
è
www.festo.com/catalogue/SFAB