Keller EV-94 EB Instruction manual

5/2004 Manual for connection and operation of the EV-94 EB page 1 of 28
Manual for connection and operation of
EV-94 EB
Version 2.0
KELLER AG für Druckmesstechnik St. Gallerstr. 119 CH-8404 Winterthur www.kellerdruck.com

5/2004 Manual for connection and operation of the EV-94 EB page 2 of 28
I N D E X
1. SAFETY REGULATIONS.................................................................................................................................................. 3
2. INTRODUCTION................................................................................................................................................................. 4
3. ELECTRIC CONNECTION............................................................................................................................................... 5
3.1. Terminal assignment........................................................................................................................................................ 5
3.2. Connection data ............................................................................................................................................................... 5
3.3. Connecting an input signal .............................................................................................................................................. 5
3.3.1. Connecting a Pt100 or Pt1000 RTD probe or a thermocouple probe..................................................................... 5
3.3.2. Connecting a 4-20mA transmitter in 2-wire-technology ........................................................................................ 6
3.3.3. Connecting a 0(4)-20mA transmitter in 3-wire-technology ................................................................................... 6
3.3.4. Connecting a 0-1V, 0-2V or 0-10V transmitter in 3-wire-technology................................................................... 6
3.3.5. Connecting a 0-1/2/10V or 0-50mV transmitter in 4-wire-technology.................................................................. 6
3.3.6. Connecting a frequency- or rotation-signal............................................................................................................. 7
3.3.7. Connecting a counter signal ..................................................................................................................................... 8
3.4. Connecting switching outputs ......................................................................................................................................... 9
3.4.1. Connection with configured low-side-switching output (NPN output, switching to GND) ................................. 9
3.3.2. Connection with configured high-side-switching output (PNP output, switching to +Uv) .................................. 9
3.4.3. Connection with configured push-pull-switching output...................................................................................... 10
3.5. Commen wiring of several GIA20EB........................................................................................................................... 10
4. CONFIGURATION OF THE DEVICE .......................................................................................................................... 11
4.1. Selecting an input signal type........................................................................................................................................ 11
4.2. Measuring voltage and current (0-50mV, 0-1V, 0-2V, 0-10V, 0-20mA, 4-20mA).................................................... 12
4.3. Measuring temperature (Pt100, Pt1000 RTD probes and thermocouple type J, K, N, S or T)............................................ 13
4.4. Measuring of frequency (TTL, switching-contact) ..................................................................................................... 14
4.5. Measuring of rotation speed (TTL, switching-contact) .............................................................................................. 15
4.6. Up-/Downwards counter (TTL, switching-contact).................................................................................................... 16
4.7. Interface mode ............................................................................................................................................................... 18
4.8. Selection of the output function .................................................................................................................................... 18
5. SWITCHPOINTS RESP. ALARM-BOUNDARIES ..................................................................................................... 20
5.1. 2-point-controller, 3-point-controller............................................................................................................................ 20
5.2. 2-point-controller with alarm function.......................................................................................................................... 21
5.3. Minimum/maximum-alarm (individual or common).................................................................................................. 22
6. OFFSET- AND SLOPE-ADJUSTMENT ........................................................................................................................ 23
7. MIN-/MAX-VALUE STORAGE...................................................................................................................................... 24
8. SERIAL INTERFACE....................................................................................................................................................... 24
9. ERROR CODES ................................................................................................................................................................. 24
10. SPECIFICATION............................................................................................................................................................. 26
11. SHORT FORM MANUAL………………………………………………………………………………...……….28

5/2004 Manual for connection and operation of the EV-94 EB page 3 of 28
1. Safety regulations
This device was designed and tested considering the Safety regulations for electronic measuring devices.
Faultless operation and reliability in operation of the measuring device can only be assured if the General
Safety Measures and the devices specific safety regulation mentioned in this users manual are considered.
1. Faultless operation and reliability in operation of the measuring device can only be assured if the device
is used within the climatic conditions specified in the chapter “Specifications“
2. Always disconnect the device from its supply before opening it. Take care that nobody can touch any of
the unit‘s contacts after installing the device.
3. Standard regulations for operation and safety for electrical, light and heavy current equipment have to be
observed, with particular attention paid to the national safety regulations (e.g. VDE 0100).
4. When connecting the device to other devices (e.g. the PC) the interconnection has to be designed most
thoroughly, as internal connections in third-party devices (e.g. connection of ground with protective earth)
may lead to undesired voltage potentials.
5. The device must be switched off and must be marked against using again, in case of obvious malfunc-
tions of the device which are e.g.:
-visible damage.
-no prescripted working of the device.
-storing the device under inappropriate conditions for longer time.
When not sure, the device should be sent to the manufacturer for repairing or servicing.
ATTENTION: When running electric devices, parts of them will always be electrically
live. Unless the warnings are observed serious personal injuries or damage to prop-
erty may result. Skilled personnel only should be allowed to work with this device. For
trouble-free and safe operation of the device please ensure professional transport,
storage, installation and connection as well as proper operation and maintenance.
SKILLED PERSONNEL
Are persons familiar with installation, connection, commissioning and operation of the product and have
professional qualification relating to their job.
For example:
• Training or instruction resp. qualifications to switch on or off, isolate, ground and mark electric circuits and
devices or systems.
• Training or instruction according to the state.
• First-aid training.
ATTENTION:
Do NOT use this product as safety or emergency stopping device, or in any other ap-
plication where failure of the product could result in personal injury or material dam-
age.
Failure to comply with these instructions could result in death or serious injury and
material damage.

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2. Introduction
The EV-94 EB is a microprocessor controlled displaying, monitoring and
controlling device.
The device is supporting one universal interface for the connection of:
- Standard transmitter signals (0-20mA, 4-20mA, 0-50mV, 0-1V,
0-2V and 0-10V )
- RTD (for Pt100 and Pt1000),
- Thermocouple probes (type K, J, N, T and S)
- Frequency (TTL and switching contact)
As well as rotation measuring, counting, etc. ...
The device features two switching outputs, which can be configured as
2-point-controller, 3-point-controller, 2-point-controller with min./max. alarm,
common or individual min./max. alarm.
The state of the switching outputs is displayed with two LED’s beneath the
front 4-digit LED-display.
The left LED displays the state of the 1st output, the right LED displays the state of the 2nd output.
Furthermore the device supports one EASYBUS-interface for communicating with a host computer that makes
the device to a full functions EASYBUS-module.
When leaving our factory the EV-94 EB has been subjected to various inspection tests and is completely
calibrated.
Before the EV-94 EB can be used, it has to be configured for the customer’s applica-
tion.
Hint: In order to avoid undefined input states and unwanted or wrong switching processes, we sug-
gest to connect the device’s switching outputs after You have configured the device properly.
For configuring the EV-94 EB please proceed as follows:
- Disassemble the red front plate (see sketch).
- Connect the device to its supply
(see chapter 3 ‘Electric connection‘).
- Switch on the supply voltage and wait until the device completed its
built-in segment test .
- Adjust the device to the input signal required. Follow the instructions
in chapter 4 ‘Input configuration‘
- Follow the instructions given in chapter 5 ‘Output and alarm
configuration‘ to configure the outputs of the EV-94 EB.
- Reassemble the red front plate.
- Connect the device properly (see chapter 3 'Electric connection‘)

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3. Electric connection
Wiring and commissioning of the device must be carried out by skilled personnel only.
In case of wrong wiring the EV-94 EB may be destroyed. We can not assume any warranty in case of
wrong wiring of the device.
3.1. Terminal assignment
11 EASYBUS-Interface
10 EASYBUS-Interface
9Input: 0-1V, 0-2V, mA, frequency, Pt100, Pt1000
8Input: 0-50mV, thermocouples, Pt100
7Input: GND, Pt100, Pt1000
6Input: 0-10V
5Supply voltage: GND
4Supply voltage: +Uv
3Switching output: GND
2Switching output: 2
1Switching output: 1
Hint: The contacts 3, 5 and 7 are connected internally.
3.2. Connection data
typical limitations
Between
terminals min. max. min. max. notes
Supply voltage 4 and 5 9 V 28 V 0 V 30 V
NPN 30V,
I<1A
Not short circuit pro-
tected
Switching output
1 and 2 PNP
1 and 3,
2 and 3 I<200mA Not short circuit pro-
tected
Input mA 0 mA 20 mA 0 mA 30 mA
Input 0-1(2)V, Freq., ... 9 and 7 0 V 3.3 V -1 V 30 V,
I<10mA
Input 0-50mV, TC, ... 8 and 7 0 V 3.3 V -1 V 10 V,
I<10mA
Input 0-10V 6 and 7 0 V 10 V -1 V 20 V
These limits must not be exceeded (not even for a short time) !
3.3. Connecting an input signal
Please take care not to exceed the limitations of the inputs when connecting the device as this may lead
to destruction of the device:
3.3.1. Connecting a Pt100 or Pt1000 RTD probe or a thermocouple probe
Pt1000
-
RTD probe (2
-
wire) Pt100
-
RTD probe (3
-
wire) Thermocouple probe
11 10 98765 321
4
11
10
9
8
7
6
5
4
3
2
EASYBUS
1V, mA, Freq., Pt100(0)
mV, TC, Pt100
GND, Pt100(0)
10V
GND, Supply -Uv
Supply +Uv
GND
EASYBUS
1
Output 2
Output 1
TC
4
5
7
8
-
+
+
_
Supply
9-28 VDC
Pt100
4
5
7
8
9
+
_
Supply
9-28 VDC
Pt1000
+
_
Supply
9-28 VDC
4
5
7
9

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3.3.2. Connecting a 4-20mA transmitter in 2-wire-technology
with individual transmitter supply without individual transmitter supply
3.3.3. Connecting a 0(4)-20mA transmitter in 3-wire-technology
with individual transmitter supply without individual transmitter supply
3.3.4. Connecting a 0-1V, 0-2V or 0-10V transmitter in 3-wire-technology
with individual transmitter supply without individual transmitter supply
3.3.5. Connecting a 0-1/2/10V or 0-50mV transmitter in 4-wire-technology
with individual transmitter supply without individual transmitter supply
(Note: Sig- and –Uv of the Transmitter must be the same potential)
+
_
Supply
9-28 VDC
4-20mA
Transmitter
+Uv
-Uv
+
_
Supply
for Transmitter
4
5
7
9
+
_
Supply
9-28 VDC
4-20mA
Transmitter
+Uv
-Uv
4
5
9
0(4)-20mA
Transmitter
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
+
_Supply:
for Transmitter
4
5
7
9
0(4)-20mA
Transmitter
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
4
5
9
Transmitter
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
+
_Supply
for Transmitter
4
5
6
7
9
10V
1V / 2V
+
_
Supply
9-28 VDC
4
5
6
9
10V
1V / 2V Transmitter
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
+
_
Supply
for Transmitter
4
5
6
7
8
9
10V
1V / 2V
Transmitter
+Uv
Sig-
-Uv
Sig+
50mV
Transmitter
+Uv
Sig-
-Uv
Sig+
+
_
Supply
9-28 VDC
4
5
6
7
9
10V
1V / 2V
50mV
Danger of overload when short circuiting the transmitter !

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3.3.6. Connecting a frequency- or rotation-signal
When measuring frequency or rotation three different input signals can be selected in the device’s con-
figuration.
There is the possibility of connecting an active signal (= TTL, ...), a passive sensor-signal with NPN
(= NPN-output, push-button, relay, ...) or PNP (= a PNP output switching to +Ub, high-side push-button, ...).
When configuring the device with a NPN switching output, a pull-up-resistor (~11k_ referring to +3.3V) is
connected internally. So when You use a device with NPN output You don‘t need to connect a resistor
externally.
When configuring the device with a PNP switching output, a pull-down resistor (~11k_ referring to GND)
is connected internally. So when You use a device with PNP output You don‘t need a resistor externally.
It may be that your measuring-signal source needs the connection of an external resistor e.g. the pull-up-
voltage of 3.3V is not enough for the signal source, or you want to measure in the top level frequency
range. In this case the input signal has to be treated like an active signal and you have to configure the de-
vice as „TTL“.
Hint: when connecting the device You have to take care not to exceed the limits of the input
voltage respective the input current of the frequency-input.
Connection of a transducer (with separate power supply) Connection of a transducer (without separate power supply)
with TTL or PNP output and external resistor for current limitation. with TTL or PNP output and external resistor for current limitation.
Connection of a transducer (with separate power supply) with NPN output. Connection of a transducer (without separate power supply) with NPN output.
Connection of a transducer (with separate power supply) with NPN output Connection of a transducer (without separate power supply) with NPN output
and needed external resistor and needed external resistor.
Hint: Rv = 3k_ (with power supply voltage = 12V) or 7k_ (with power supply voltage = 24V), device configuration: Sens = TTL
+
_
Supply
9-28 VDC
+
_Supply
for Transducer
4
5
7
9
Transducer
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
4
5
9
Transducer
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
4
5
7
9+
_Supply
for Transducer
Rv
Transducer
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
4
5
9
Rv
Transducer
+Uv
Sig.
-Uv
Transducer
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
+
_
Supply
for Transducer
4
5
7
9
+
_
Supply
9-28 VDC
4
5
9Transducer
+Uv
Sig.
-Uv

5/2004 Manual for connection and operation of the EV-94 EB page 8 of 28
Connecting of a transducer (with individual power supply) Connecting of a transducer (without individual power supply)
PNP output with external resistor wiring. PNP output and external resistor wiring.
Hint: Rv2 = 600_, Rv1 = 1.8k_ (with power supply voltage = 12V) or 4.2k_ (with power supply voltage = 24V), device config.: Sens = TTL
(Rv1 is a current limiting resistor and may be shorted if necessary. It should never exceed the mentioned value.)
3.3.7. Connecting a counter signal
When configuring the device you can select 3 different input signal modes similar to the connetion of
frequency- and rotation-signals. The connection of a sensor-signal for a counter-signal is the same used
for the frequency- and rotation-signal.
Please use the wiring diagram given below.
There is the possibility to reset the counter. When connecting contact 8 with GND (e.g. contact 7) the
counter will be reset. You can do this manually (e.g. with the help of a push-button) or automatically
(with one switching output of the device).
Hint: When connecting the device, take care not to exceed the limits of the input-voltage or the input-
current of the frequency input.
manually reset the device with the help of a push-button
automatically resetting with the help of output 2 and
additional resetting the device via push-button
Hint: Output 2 has to be configured as NPN output
Cascading of EV-94 EB`s
Hint for EV-94 EB:
Device 1 – Input signal like impuls-transmitter,
Output 2 configured as NPN output
Device 2 – Input-signal = switching-contact
Reset-
Button
+
_
Supply:
9-28 VDC
4
5
7
8
9Transducer
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
2
4
5
7
8
9
Device
No.1
Pulse
generator
+Uv
Sig.
-Uv
2
4
5
7
8
9
Device
No.2
Reset-
Button
+
_
Supply
9-28 VDC
2
4
5
7
8
9Transducer
+Uv
Sig.
-Uv
+
_
Supply
9-28 VDC
4
5
7
9+
_Supply
for Transducer
Transducer
+Uv
Sig.
-Uv
Rv2
Rv1
+
_
Netzteil:
9-28 VDC
4
5
7
9
Geber
+Uv
Sig.
-Uv
Rv2
Rv1

5/2004 Manual for connection and operation of the EV-94 EB page 9 of 28
3.4. Connecting switching outputs
The device features two switching outputs, with three different operating modes for each switching out-
put, which are:
Low-Side: “GND-switching“ NPN output (open-collector)
The switching output is connected to the negative rail of the supply voltage (connection 3
or 5) when active (switching output on).
High-Side: “+Ub-switching“ PNP output (open-collector)
The switching output is connected to the positive rail of the supply voltage (connection 4)
when active (switching output on).
Push-Pull: The switching output is connected to the negative rail of the supply voltage (connection 3
or 5) when inactive. When the switching output is active, it’s connected to the positive rail
of the supply voltage (connection 4).
In case of configuring one output as an alarm output, the output will be active in idle state (no alarm pre-
sent). The output transistor opens or the push-pull output changes from +Uv to –Uv when an alarm con-
dition occurred.
Hint: In order to avoid unwanted or wrong switching processes, we suggest to connect the
device’s switching outputs after you have configured the device’s switching outputs
properly.
Please take care that you must not exceed the limits of the voltage and of the maximum current
of the switching outputs (not even for a short period of time). Please take extreme care when
switching inductive loads (like coils or relays, etc.) because of their high voltage peaks, protec-
tive measures to limit these peaks have to be taken.
When switching large capacitive loads a series resistor for current limitation needed, because of
the high turn-on-current of high capacitive loads. The same applies to incandescent lamps,
whose turn-on-current is also quite high due to their low cold resistance.
3.4.1. Connection with configured low-side-switching output (NPN output, switching to GND)
Connection of consumer loads (relay and lamp) Connection of consumer loads (relay and lamp)
(without individual supply voltage) (with individual supply voltage)
3.4.2. Connection with configured high-side-switching output (PNP output, switching to +Uv)
Connection of consumer loads (relay and lamp)
+
_
Supply
9-28 VDC
+
_
Supply
for load
1
2
3
4
5
+
-
Relay
Hints:
Connections 3 and 5 are internally electrically connected.
When switching higher currents (> 50 mA) , the –Uv connec-
tion should not be attatched to the device (connection 3) but to
the –Uv connection of the external power supply unit.
When doing this, you get rid off ground displacement.
+
_
Supply
9-28 VDC
1
2
3
4
5
+
-
Relay
+
_
Supply
9-28 VDC
1
2
3
4
5
+
-
Relay
V
oltage limitation by recovery diodes (i.e. 1N4007) !
V
oltage limitation by recovery diodes (i.e. 1N4007) !
V
oltage limitation by recovery diodes (i.e. 1N4007) !

5/2004 Manual for connection and operation of the EV-94 EB page 10 of 28
3.4.3. Connection with configured push-pull-switching output
Connection of a semiconductor-relay
3.5. Common wiring of several EV-94 EB
Inputs and outputs are not electrically isolated. When interconnecting several EV-94 EB`s you have to make
sure that there is no potential displacement.
Make sure to observe the following points:
- When several EV-94 EB`s are connected to the same power supply unit it is highly recommended to isolate
the sensors, measuring transducers etc.
- When the sensors, measuring transducers etc. are electrically connected, and you can’t manage to isolate
them, you should use separate electrically isolated power supply units for each devices. Please note, that
an electric connection may also be created via the medium to be measured (e.g. pH-electrodes and con-
ductivity-electrodes in fluids).
+
-
Uin
Semicond.-
relay
+
_
Supply
9-28 VDC
1
2
3
4
5