Kracht AS 8 User manual

AS 8
Operating Instructions
Volutro nic 

PAGE 2 BAS8-02.02-GB

BAS8-02.02-GB Page 3
1. SAFETY 4
2. DESCRIPTION 5
3. CONNECTING THE AS8 6
3.1 Connecting the voltage supply 6
3.2 Connecting the volume counter 6
3.2.1 How is the flow rate measurement activated ? 8
3.2.2 How is the volume measurement activated ? 8
3.3 Connecting the relay contacts 9
3.4 Connecting the analogue outputs 10
3.5 Connecting the printer 12
3.5.1 Which data can be printed out ? 12
3.5.2 How is the data printed out ? 12
3.6 Parameterising via the serial interface 13
3.7 Error display 13
4. AS8 PROGRAMMING 14
4.1 Overview of the input values 15
4.2 What must be programmed when connecting a volume counter? 16
4.3 Which display parameters can be represented (DIP switches) ? 17
4.4 How is the display set ? 18
4.5 What must be programmed when connecting the relay outputs ? 19
4.6 What must be programmed when connecting the analogue output ? 20
5. TECHNICAL DATA 21
6. TYPE CODE 22
7. CONNECTIONS 23
8. SETTING THE SUPPLY VOLTAGE 24
9. DIMENSIONS 25
10. AS8 AS 19“ RACK UNIT 26
11. AS8 IN THE DESK-TOP HOUSING 27

PAGE 4 BAS8-02.02-GB
1. Safety
The safety notes included in these operating instructions are indicated by
this ‘attention-getter’ symbol.
If the text accompanying this symbol is not heeded, danger to personnel or
equipment may result.
)Other instructions, which are not safety warnings, but which give advice on
optimum operation, are indicated by a hand.
General safety instructions
The electronic AS8 is constructed to the latest standards in technology. The AS8
should be operated only
in technically sound condition,
as instructed,
with awareness of the safety precautions, following these operating instructions.
The AS8 must only be operated as an item of equipment installed in an internal area.
The AS8 must only be operated in the prescribed condition.
The stated limiting values (see also section on “Technical Data“) must, under no
circumstances, be exceeded.
Personnel engaged in the installation, operation and maintenance of the AS8 must
be appropriately qualified. This qualification can be obtained by appropriate training
or instruction. Such personnel must be familiar with the contents of these operating
instructions.
During all operations the relevant national regulations relating to safety
precautions in the work place and where applicable, internal regulations of
the operator must be observed, even if these are not detailed in these
operating instructions.
The AS8 must not be operated in hazardous areas, nor in areas where
medical apparatus is in use, nor in areas which are expressly named in
VDE 0411 Part 100.
If the AS8 is used for the control of machines or sequential processes
where damage to the machine or accident to operating personnel is
possible as a consequence of failure or faulty operation of the AS8, then
appropriate safety precautions must be implemented.
)
)
In the case of variations (including those relating to operating behaviour),
which prejudice safety, the AS8 must be switched off immediately.
During installation work on the AS8, the power supply must always be
disconnected. Installation work must only be carried out by appropriately
qualified personnel.

BAS8-02.02-GB Page 5
2. Description
Measuring equipment devices in the AS8 series are four segment indicator units for
flow rate and volumetric measurement.
The units are usually operated in conjunction with KRACHT volume counters.
However, other measuring systems with incremental signals can be connected.
These may, for example, be oval wheel meters or angle of rotation sensors.
The incremental input signals are filtered, converted and translated by the micro
controller into the physical quantities of flow rate and volume.
Two relays, an analogue output or an RS232 serial interface, are available for
additional external processing.
Programming and adjustment is achieved by means of three keys which are
accessible on removal of the front cover.
The integrated 24 V DC sensor supply enables direct connection to the volume
counter.
The measuring devices in the AS8 series are obtainable as built-in control panel
devices, as desk-top units, or as 19“ rack-mounted units.
The variety of characteristics and alternatives available make this compact unit
always the first choice, particularly from the viewpoint of cost saving and when there
is a special requirement to determine flow rate and volume.
Manufacturers address:
KRACHT GmbH
Gewerbestraße 20
58791 Werdohl
Tel. 02392 / 935-0
Fax 02392 / 935209

PAGE 6 BAS8-02.02-GB
3. Connecting the AS8
This section deals with the layout of the connections on the AS8. The electrical
connections are made on a screw terminal strip.
The connection layout for the desk-top unit and the 19” rack-mounted unit versions
are covered in sections 10 and 11.
3.1 Connecting the voltage supply
The AS8 is operated with an alternating voltage of 230 V / 115 V AC or direct voltage
12 / 24V DC. Please specify the kind of power supply when ordering.
The exact type can be found in chapter 6.Type code.
The connections for alternating-current voltage 120 / 230V AC :
L Terminal 1
NTerminal 2
PE Terminal 3
The connections for direct voltage 12 / 24V DC :
+ Terminal 1
GND Terminal 2
PE Terminal 3
Fire
prevention:
The unit should be protected by an external fuse on the
supply side. In accordance with VDE 0411, in the event of
failure, 8A / 150 VA must not be exceeded. The
recommended external fusing is 100 mA at a supply voltage
of 115 and 230 Volt.
3.2 Connecting the volume counter
The AS8 is preferably operated in conjunction with KRACHT volume counters.
However, other measuring systems with incremental signals can be connected.
These can be, for example, oval wheel meters or angle of rotation sensors.

BAS8-02.02-GB Page 7
Sensor supply
The sensor supply is not short circuit proof.
)The sensor supply is connected to connections 8 and 9. However, the
sensor supply must not be used for the supply of unearthed inductances or
capacitive loads.
Voltage Ripple Maximum permissible
current
Terminal 8 +24 VDC +/- 20 % load dependent 50 mA
Terminal 9 0 V
Signal inputs
Measuring systems with incremental signals provide two square wave pulses. The
square wave pulses are displaced from one another by 90°. It is therefore possible to
detect the direction. This is referred to as a two channel layout.
If a measuring system with one square wave output is available, it is referred to as a
single channel layout. In this case direction detection is not available.
)Single channel or two channel connection must be set on the AS8. The
settings required are made under menu reference „08“ at the “meter
input” position (see 4.1 overview of the input values).
Connection of the signal inputs is made on terminals 10 and 11. Connection terminal
11 is not used on the single channel layout.
Channel 1 Channel 2
Counting input Terminal 10 Terminal 11
The measurement parameters of flow rate and volume are derived from the square
wave signals.
)The terms volume measurement and flow rate measurement are often
interchanged, however, they are two completely different measurement
parameters.
)The indicator, the relay and the analogue output can be switched between
flow rate measurement and volume measurement, as desired. This is
achieved in the programming of the AS8 under the menü reference „7“. A
„0“ is set for flow rate measurement and a „1“ for volume measurement
(see 4.1 Overview of the input values).

PAGE 8 BAS8-02.02-GB
3.2.1 How is the flow rate measurement activated ?
As soon as a medium flows through the volume counter a flow rate indication
appears. No special action is required. The instantaneous flow rate is indicated, as a
rule in litres per minute.
)The AS8 must be adjusted to the actual volume counter that is connected.
The procedure is given in section 4.2 What must be programmed when
connecting a volume counter?
3.2.2 How is the volume measurement activated ?
By volumetric measurement is implied the summation of the amount of a medium
which has flowed through a volume counter. As a rule the indication is in litres.
)The summation commences when the summation enable is switched.
The enable input is connected to terminal 12.
)If there is a voltage of 24 V at the enable input, summation of the volume
commences. The measured values on the display change.
If there is a voltage of 0 V at the enable input, summation of the volume is
stopped. The measured values on the display do not change.
When the voltage at the enable input is changed from 0 V to 24 V the
summation is reset to zero. The determination of the volume starts again.
)The AS8 must be set for the particular volume counter that is connected
The procedure is given in section 4.2 What must be programmed when
connecting a volume counter?

BAS8-02.02-GB Page 9
3.3 Connecting the relay contacts
The AS8 has two relay contacts. The relays are designed as potential-free contacts.
That is to say, the user must input the potential at the base terminal.
The relays are provided with normally-open contacts. The switching
voltage is 24 V, maximum switching current is 1A. Voltages greater than
48 V must not be switched on any account.
Relay Contact ( Signal ) Common terminal (Base)
K0 Terminal 5 Terminal 7
K1 Terminal 6 Terminal 7
How do the relays operate ?
The function of the relays can be set as required, i.e. each relay can be allocated to
the flow rate or volume measurement parameters.
)The relays can be set as required to flow rate measurement or volume
measurement. Thhis is achieved in the programming of the AS8 under the
menu reference „7“ at the „Relais 1“ or „Relais 2“ position. A „0“ sets the
flow rate position, a „1“ sets the volume measurement (see 4.1 Overview
of the input values).
An on and an off switching value can be programmed for each relay. The relay
switches when the switch-on value is exceeded. When the switch-off value is
undershot, the relay drops out again. The relays can be programmed as normally-
open or normally-closed.
)The programming of the switch-on and switch-off values is given in
section 4.5 What must be programmed when connecting the relay
outputs?.

PAGE 10 BAS8-02.02-GB
3.4 Connecting the analogue outputs
The AS8 operates via an analogue output or a serial interface. The appropriate
adjustment is achieved within the device, by means of jumpers. The jumper settings
for current output and voltage output are shown in the accompanying figures.
Current output setting JP2 JP1
15
14
13
JP3 12
JP5 11
10
P3 JP4 P2 P1 9
8
7
)The strength can be set on P1 and the offset on P2.
Voltage output setting JP2 JP1
15
14
13
JP3 12
JP5 11
10
P3 JP4 P2 P1 9
8
7
)The strength can be set on P3 and the offset on P2.
In accordance with the software, the settings +/-10 Volt, 0-10 Volt and 2-10
Volt and +/-20 mA, 0-20 mA and 4-20 mA are available for signal selection.
The selection is carried out by programming the AS8 under menu
reference “8“ at the “Analogue output“ position. The functions are set
using “0“ or “1“ (see 4.1 Overview of the input values).
PLUS Minus
Analogue output Terminal 14 Terminal 15

BAS8-02.02-GB Page 11
How does the analogue output function ?
The function of the analogue output can be freely selected, i.e. it can be assigned to
the measurement parameters of flow rate or volume.
)The display, the relay and the analogue output can be switched to flow rate
measurement or volume measurement , as required. This selection takes
place when programming the AS8 under menu reference “7” at the
“analogue output” position. A “0” sets flow rate measurement and a “1”
sets volume measurement (see 4.1 Overview of the input values).
A maximum value can be programmed for the analogue output. The maximum value
corresponds to an output of 10 V and 20 mA.
)The details of programming the maximum value are given in section 4.6
What must be programmed when connecting the analogue output ?

PAGE 12 BAS8-02.02-GB
3.5 Connecting the printer
The AS8 makes use of a serial interface having an RS232 layout. The choice
between analogue output or serial interface is made by means of a jumper inside the
unit.
Setting for the serial interface JP2 JP1
15
14
13
JP3 12
JP5 11
10
P3 JP4 P2 P1 9
8
7
The RS232 has the fixed setting: 9600 baud, 8 bit, No parity, XON, XOFF.
There is no hardware handshake.
Transmit data
TXD
Receive data RXD Functional earth
GND
RS 232 Terminal 14 Terminal 15 Terminal 9
The interface can be operated as a printer interface and for “parameterising” the
AS8. There is no switch-over between the operating modes.
In the printer interface operating mode, the selected data is output as ASCII
characters via the serial interface.
The instantaneously displayed value is printed out each second, followed by a CR
LF.
Example:
Displated value Printout ASCII String
3.500 + 3.500 2 B 33 2E 35 30 30 0D 0A
3.5.1 Which data can be printed out ?
The currently displayed value is printed out.
3.5.2 How is the data printed out ?
A printout is triggered via a digital input. The values are transferred to the serial
interface in a per second sequence.
)The printer drive is switched-on on the application of a voltage of 24 V at
the enable input (terminal 13).

BAS8-02.02-GB Page 13
3.6 Parameterising via the serial interface
A PC or a PLC is connected to the AS8 via the serial interface.
The PC or PLC can change specific AS8 parameters by means of an ASCII character
string.
The unit distinguishes between the different values through an identifying letter.
No protocol is used.
The character string is received complete as an ASCII string and converted on
acceptance. ASCII strings can only be received one after the other. If a faulty string is
received, an ERROR string is sent.
Example:
Identifying letter Input value String ASCII STRING
APulse size volume counter A0.040 41 30 2E 30 34 30
BMax.value analogue output B3.500 42 33 2E 35 30 30
CDamping - digital filter C9999. 43 39 39 39 39 2E
D‘Pull-in’ value Relay 1 D0.000 44 30 2E 30 30 30
E‘Drop-out’ value Relay 1 E1.000 45 31 2E 30 30 30
F‘Pull-in’ value Relay 2 F1.500 46 31 2E 35 30 30
G‘Drop-out’ value Relay 2 G3.000 47 33 2E 30 30 30
ERROR String (Echo) ERROR0 45 62 62 5F 62 30
3.7 Error display
On two channel volume counters it is possible to monitor the correct pulse sequence
on the channels. Faulty pulses are not counted and thus do not change the volume
measurement.
If an error is established by the AS8, the character sequence “FAUL“ appears in the
display.
)The error display can also be completely isolated. This is carried out under
the menu reference “08“ at the “Error display“ position. The error display
is enabled with a “0” and blocked with a “1” (see 4.1 Overview of the
input values).

PAGE 14 BAS8-02.02-GB
4. AS8 programming
Each time the AS8 is to be operated, it is necessary to adapt the unit to the volume
counter that is connected.
Input procedure:
The input procedure is the same for all input values and is therefore described once
only.
Programming is carried out by means of three keys which are accessible on
removing the front cover. With the keyboard version /F the configuration can be
made with keys on front panel.The positions of these three keys is shown below.
DIP- Switches
F1
F2 F3
Start input operation
“F1“ is depressed for approx. four seconds to start the input operation.
The first three segments are switched dark, segments four and five display the menu
reference number ”00“. Release “F1“.
Change menu reference
By briefly pressing “F1“ the menu reference numbers “00” to “08” can be displayed
in sequence.
An input value is concealed behind each menu reference number.
To display the input value, press “F3” briefly. A four digit input value appears.
Change input value
The point marks the digit which can be changed by actuating “F3”.
The point can be moved by actuating “F2“.
After setting the numerical values the point must be placed at the correct position.
On actuating “F1”, the display reverts to the menu-reference level. The menu
reference “00” is displayed again.
Stop input value
To exit the input operation, depress “F1” again for approx. four seconds.

BAS8-02.02-GB Page 15
4.1 Overview of the input values
The values which are required to be set can be inserted in the column labelled “Input
value-User”.
Menu -
Reference
Standard
setting
Input value -
User
Function
00 0.040 Pulse volume of volume counter
01 4.000 Maximum value Analogue output
02 0001. Damping Digital filter
03 9999. “Pull-in” value Relay 1
04 9999. “Drop-out” value Relay 1
05 9999. “Pull-in” value Relay 2
06 9999. “Drop-out” value Relay 2
07 0000
Display : 0= Flow rate / 1= Volume
Analogue output: 0= Flow rate / 1 = Volume
Relay 1 : 0= Flow rate / 1= Volume
Relay 2 : 0= Flow rate / 1= Volume
08 0000
Counter input : 0= 2-channels / 1= 1 channel
Error display : 0 = Activated / 1= Blocked
Analogue output : 0= Bipolar / 1= Unipolar
Analogue output : 0= 0-20mA / 1= 4-20 mA
If the on and off values for the relays are set at 9999. , then the relays are isolated.

PAGE 16 BAS8-02.02-GB
4.2 What must be programmed when connecting a volume counter?
The AS8 Microcontroller is set-up for the connected volume counter.
This is carried out under menu reference “00 - pulse volume volume counter” and
under menu reference “08” at the position “counter input”.
The pulse volumes for KRACHT Volume counters can be obtained from the Table.
The “X” characters in the “Input value Menu reference 08“ column are of no
significance in setting the volume counter.
Designation Material Input value
Menu reference 00
Input value
Menu reference 08
VC 0,025 Sp. Gr./ Iron* 0,025 cm3XXX0 2 channels
VC 0,04 Sp. Gr./ Iron 0.040 cm3XXX0 2 channels
VC 0,2 Sp. Gr./ Iron 0.245 cm3XXX0 2 channels
VC 1 Sp. Gr./ Iron 1.036 cm3XXX0 2 channels
VC 3 Sp. Gr./ Iron 3.000 cm³ XXX0 2 channels
VC 5 Sp. Gr./ Iron 5.222 cm3XXX0 2 channels
VC 10 Sp. Gr./ Iron 10.48 cm3XXX0 2 channels
VCA0,2VCN0,2 Aluminium 0.200 cm³ XXX1 1 channel
VC 0,2 AL Aluminium 0.245 cm³ XXX0 2 channels
VCA 2 Aluminium 2.000 cm3XXX1 1 channel
VC 0,2 .JR High grd. St.* 0.200 cm³ (old) XXX0 2 channels
VC 1 .JR High grd. St. 1.000 cm3 (old) XXX0 2 channels
VC 5 .JR High grd. St. 5.000 cm3 (old) XXX0 2 channels
VCL 0,1 PA(B) High grd. St. 0.100 cm3 (old) XXX0 2 channels
* Sp. Gr. Iron = Spheroidal graphite iron * High grd. St. = High grade steel
Example:
A VC0.04 volume counter is connected. The pulse volume is 0.040 cm3. The VC 0.04
Volume counter has a 2 channel layout.
The value 0.040 is entered under menu reference “00“.
A “0” is entered under menu reference “08” at the position designated “counter
input”.

BAS8-02.02-GB Page 17
4.3 Which display parameters can be represented (DIP switches) ?
The physical parameters “l/h“, “l/m“, “l/s“ and “Usgal/h“, “Usgal/m“, “Usgal/s“ can be
set as display units. Switching between the display parameters is achieved using the
DIP switches. The DIP switches are located behind the front cover.
Setting the volume:
SW 1 Function Factory setting
OFF Indication in LITRES X
ON Indication in USGAL
Setting the time base:
SW 2 SW 3 Function Factory setting
OFF OFF Minutes X
OFF ON Minutes
ON OFF Hours
ON ON Seconds
In principle, parameters such as Millilitres, Grams, Millimeters, Meters and Kilograms
can also be displayed. These can be set via the pulse volume.
Example: Volume counter connection VC1
Unit Pulse factor
Volume counter
Conversion
factor
Density
medium
Pulse volume
Menu
reference 00
Millilitres
Grams
Kilograms
1.036 x 1000 x 1.000 = 1036
1.036 x 1000 x 1.230 = 1274
1.036 x 1 x 1.230 = 1.274
Units of length are converted in the same way.
Example: Measurement of the speed or position of a cylinder.
VC1mounted on the piston.
Piston diameter = 10 cm => A= 10 cm x 10 cm x PI/ 4 = 78.54 cm2
Factor VC 1.036 cm3
Factor for each pulse = -------------- = --------------- = 0.01319 cm = 0.1319 mm
Area A78.54 cm2 =========
Unit Factor for each
pulse
Conversion
factor
pulse volume
Menu reference 00
Millimetres
Metres
0.1319 x 1000 = 131.9
0.1319 x 1 = 0.132

PAGE 18 BAS8-02.02-GB
4.4 How is the display set ?
The display can be set for flow rate measurement or volume measurement.
Flow rate measurement
A “0” is entered at the position designated “Display” under the menu reference
“07” (see 4.1 Overview of the input values).
Filter function
The measuring principle applied to the AS8 is that of ‘period of oscillation’. When the
flow rate is subject to severe fluctuation, the digital filter provides a smoothing effect
to steady the indication.
A digital filter can be activated under the menu reference “02”..
The higher the input value the greater the filter effect.
Programmed value 0000: no filter effect
Programmed value 9999: maximum filter effect
Volume measurement
A “1” is entered at the position designated “Display”, under the menu reference
“07” (see 4.1 Overview of the input values).
The pulses of the volume counter are counted, converted using the pulse volume and
displayed.

BAS8-02.02-GB Page 19
4.5 What must be programmed when connecting the relay outputs ?
The relay function is selectable. A relay can be allocated to flow rate or volume
measurement.
Flow rate measurement
A “0” is inserted under the menu reference “07”. This takes place at the position
designated “Relay 1” or “Relay 2” (see 4.1 Overview of the input values).
Volumetric measurement
A “1” is inserted under the menu reference “07”. This takes place at the position
designated “Relay 1” or “Relay 2” (see 4.1 Overview of the input values).
Switch functions
For Relay 1, programming takes place under the menu references “03” and “04”, for
Relay 2 under the menu references “05” and “06” (see 4.1 Overview of the input
values).
The following switch functions can be obtained::
Normally-open function
On reaching the switch-on value the contact is closed.
Example: Switch-on value (pull-in): 2,500
Switch-off value (drop-out): 9999
The relay contact is switched when the switch-on value is exceeded. The switch-off
value of 9999 has the consequence, that only the switch-on value is evaluated. The
relay is not disconnected when the switch-off value is reached.
Normally-closed function
On reaching the switch-off value the contact is opened.
Example: Switch-on value: 0.000
Switch-off value: 3,000
The relay contact is switched so long as the switch-off value is not reached. The
switch-on value of 0.000 has the consequence, that only the switch-off value is
evaluated. The relay is not switched-off if the switch-on value is reached.
Window function
Example: Switch-on value: 2,500
Switch-off value: 3,000
The relay contact is switched when the switch-on value is reached. If the switch-off
value is exceeded, the relay opens again.

PAGE 20 BAS8-02.02-GB
4.6 What must be programmed when connecting the analogue output ?
The function of the analogue output is selectable. The analogue output can be
assigned to flow rate or volume measurement.
Flow rate measurement
A “0” is entered under menu reference “7”. This takes place at the position
designated “Analogue output” (see 4.1 Overview of the input values).
Volume measurement
A “1” is entered under menu reference “7”. This takes place at the position
designated “Analogue output” (see 4.1 Overview of the input values).
Signal selection
Menu reference 08 Analogue output
00XX +/- 20 mA or +/- 10 Volt
01XX 0 - 20 mA or 0 - 10 Volt
10XX +/- 20 mA or +/- 10 Volt
11XX 4 - 20 mA or 2 - 10 Volt
The digits identified with an “X” in the Menu reference “08” column are of no
significance to the setting procedure.
The maximum value is entered under the menu reference “01”, maximum analogue
output, corresponding to an output of 10 V or 20 mA.
Example:
Maximum analogue output value: 4,000 [ Litres / minute ]
The flow rate is 4,000 Litres/minute, so 10 Volt or 20 mA are output. If the flow rate is
0,000 Litres/minute, then 0 Volt or 0 mA is output.