Orbit Merret OM 502 User manual

OM 502
5 DIGIT PROGRAMMABLE INSTRUMENT
DC VOLTMETER/AMMETER
PROCESS MONITOR
INTEGRATOR
LINEARIZATOR
DISPLAYS FOR LINEAR POTENTIOMETERS
DISPLAY INSTRUMENT FOR TENSIOMETERS
DISPLAYS FOR LVDT SENSORS
USER MANUAL
148.9~C-263mm
453mV
Outstanding Measurement Value

2| INSTRUCTIONS FOR USE OM 502
TECHNICAL DATA
Measuring instruments of the OM 502 series conform to the European regulation 2014/30/EU and 2014/35/EU
The instruments are up to the following European standards
EN 61010-1 Electrical safety
EN 61326-1 Electronic measuring, control and laboratory devices
- Requirements for EMC “Industrial use”
IEC 980: 1993, Par. 6 Seismic resistance
The recorders are applicable for unlimited use in agricultural and industrial areas.
ORBIT MERRET, spol. sr.o.
Vodňanská 675/30
19800 Praha 9
Czech republic
Tel: +420 - 281040200
Fax: +420 - 281040299
[email protected]
www.orbit.merret.eu
SAFETY INSTRUCTIONS
Please read carefully the enclosed safety instructions and observe them!
Installation, all operational interventions, maintenance and service must be performed by a qualified per-
sonnel and in accordance with the attached information and safety regulations. The manufacturer is not
liable for damage caused by improper installation, configuration, maintenance, and service.
The recorder must be installed according to the respective application. Incorrect installation can cause a
malfunction, which can result in damage or accident.
The recorder uses dangerous voltages that can cause a fatal accident. Before you start solving problems
(e.g. in case of failure or disassembly), the device must be disconnected from the power supply. For safety
information the EN 61010-1 + A2 standard must be observed.
When removing or inserting a card, observe the safety instructions and follow the recommended procedure.
During any intervention the recorder must be disconnected from the power supply.
Do not attempt to repair or modify the device. A defective recorder must be sent for repair to the manufacturer.
These devices should be safeguarded by isolated or common fuses (breakers)!
The recorder is not designed for installation in potentially explosive surroundings (Ex). Use it only outside
potentially explosive surroundings

INSTRUCTIONS FOR USE OM 502 | 3
1.CONTENTS
1. CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. INSTRUMENT DESCRIPTION . . . . . . . . . . . . . . . . . . . 4
3. INSTRUMENT CONNECTION. . . . . . . . . . . . . . . . . . . . 6
Measuring ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Termination of RS 485 communication line . . . . . . . . 6
Instrument connection . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended connection of sensors. . . . . . . . . . . . 8
4. INSTRUMENT SETTING . . . . . . . . . . . . . . . . . . . . . . 10
Symbols used in the instructions . . . . . . . . . . . . . . . 12
Setting the DP and the (-) sign . . . . . . . . . . . . . . . . . 12
Control keys function . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setting/permitting items into “USER” menu . . . . . . . 13
5. SETTING “LIGHT” MENU . . . . . . . . . . . . . . . . . . . . . .14
5.0 Description “LIGHT” menu . . . . . . . . . . . . . . . . . . . 14
Setting input - Type “DC” . . . . . . . . . . . . . . . . . . . . . . 18
Setting input - Type “PM” . . . . . . . . . . . . . . . . . . . . . . 20
Setting input - Type “I”. . . . . . . . . . . . . . . . . . . . . . . . .22
Setting input - Type “LX” . . . . . . . . . . . . . . . . . . . . . . . 24
Setting input - Type “DU” . . . . . . . . . . . . . . . . . . . . . .26
Setting input - Type “T” . . . . . . . . . . . . . . . . . . . . . . . . 28
Setting input - Type “LVDT” . . . . . . . . . . . . . . . . . . . .30
Setting Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Setting analog output . . . . . . . . . . . . . . . . . . . . . . . . .34
Selection of programming menu „LIGHT“/„PROFI“ . .36
Restoration of manufacture setting . . . . . . . . . . . . .36
Automatic calibration - input range (only “DU”) . . . . 37
Selection of instrument menu language version . .38
Setting new access password . . . . . . . . . . . . . . . . .38
Instrument identification . . . . . . . . . . . . . . . . . . . . . . . 39
6. SETTING “PROFI” MENU . . . . . . . . . . . . . . . . . . . . . 40
6.0 Description of “PROFI” menu . . . . . . . . . . . . . . . . . . 40
6.1 “PROFI” menu - INPUTS
6.1.1 Resetting internal values . . . . . . . . . . . . . . . .42
6.1.2 Setting measuring type, range, mode, rate. . 43
6.1.3 Setting the Real Time . . . . . . . . . . . . . . . . . . . 45
6.1.4 External input function selection . . . . . . . . . . 48
6.1.5 Optional accessory functions of the keys . . 49
6.2 “PROFI” menu - CHANNEL
6.2.1 Setting measuring parameters
(projection, filters, decimal point, description) . . . . . 57
6.2.2 Setting mathematic functions . . . . . . . . . . . . 57
6.2.3 Setting integrator parameters . . . . . . . . . . . .60
6.2.4 Selection of evaluation of min/max. value . . 64
6.3 “PROFI” menu - OUTPUT
6.3.1 Setting data logging. . . . . . . . . . . . . . . . . . . . . 66
6.3.2 Setting Limits . . . . . . . . . . . . . . . . . . . . . . . . . .68
6.3.3 Setting data output . . . . . . . . . . . . . . . . . . . . . 71
6.3.4 Setting analog output . . . . . . . . . . . . . . . . . . . 72
6.3.5 Selection of display projection . . . . . . . . . . . . 74
6.4 “PROFI” menu - SERVICE
6.4.1 Selection of programming menu
„LIGHT“/„PROFI“ . . . . . . . . . . . . . . . . . . . . . . . . 76
6.4.2 Restoration manufacture setting . . . . . . . . . . 77
6.4.3 Automatic calibration - input range . . . . . . . . 78
6.4.4 Selection of instrument menu
language version . . . . . . . . . . . . . . . . . . . . . . . 79
6.4.5 Setting new access password . . . . . . . . . . . 79
6.4.6 Instrument identification . . . . . . . . . . . . . . . . . 79
7. SETTING ITEMS INTO “USER” MENU . . . . . . . . . . . . 80
8. DATA PROTOCOL . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
9. ERROR STATEMENTS . . . . . . . . . . . . . . . . . . . . . . . . 84
10.TABLE OF SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . 85
11. TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . 86
12. INSTRUMENT DIMENSIONS AND INSTALATION . . . . 88
13. CERTIFICATE OF GUARANTEE . . . . . . . . . . . . . . . . ..89

4| INSTRUCTIONS FOR USE OM 502
2. INSTRUMENT DESCRIPTION
2.1 DESCRIPTION
The OM 502 model series are 5 digit panel programmable instruments.
The instrument is based on 8-bit microcontroller with hight-rate 24-bit sigma-delta converter, which secures high accuracy,
stability and easy operation of the instrument.
TYPES AND RANGES
DC DC Voltmeter/Ammeter
±999,99 mV; ±999,99 mV; ±9,9999 V; ±99,999 V; ±300,00 V
±999,99 A; ±9,9999 mA; ±99,999 mA; ±999,99 mA; ±5,0000 A
PM Process monitor
0…5 mA/0…20 mA/4…20 mA/±2 V/±5 V/±10 V
I Integrator
0…5 mA/0 …20 mA/4…20 mA/±2 V/±5 V/±10 V
L Linearizator
0…5 mA/0…20 mA/4…20 mA/±2 V/±5 V/±10 V
DU Display unit for linear potentiometers
Linear potentiometer (min. 500 )
T Weighing indicator
1…4 / 2…8 / 4…16 mV/V
LVDT Display unit for LVDT sensor
1 / 3 / 5 VAC, 2,5 / 5 / 10 kHz
PROGRAMMABLE PROJECTION, FUNCTION
Measuring range: adjustable (PM, I, LX) or as per order (DC, T)
Setting: manual, optional display projection may be set for both limit values of the input signal,
e.g. input 0…20 mA> 0…8500,0
Projection: ±99999 (-99999…999999)
Integration (I): with time base 1 s, projection of integrated and current value
Weighing function (T): manual or automatic calibration, signalization of stabilized equilibrium, zero stabilization,
automatic zero monitoring, defined number of sections on the scale
Projection (T): ±99999 (Mode - Standard)
selection of size of the section - 0,001/0,002/0,005/0,01/0,02/0,05/0,1/0,2/0,5/1/2/5/
10/20/50/100 (Mode - WEIGHT)
LINEARIZATION
Linearization: by linear interpolation in 50 points (solely via OM Link)
Linearization (LX): linear interpolation in 256 points and 16 tables
DIGITAL FILTERS
Floating average: from 2…30 measurements
Exponen.average: from 2…100 measurements
Rounding: setting the projection step for display
MATHEMATIC FUCTIONS
Min/max. value: registration of min./max. value reached during measurement
Tare: designed to reset display upon non-zero input signal
Fixed tare: fixed preset tare
Peak value: the display shows only max. or min. value
Mat. operations: polynome, 1/x, logarithm, exponential, power, root, sin x

INSTRUCTIONS FOR USE OM 502 | 5
2.INSTRUMENT DESCRIPTION
EXTERNAL CONTROL
Lock: control keys blocking
Hold: display/instrument blocking
Tare: tare activation/resetting tare to zero
Resetting MM: resetting min/max value
Memory: data storage into instrument memory
2.2 OPERATION
The instrument is set and controlled by five control keys located on the front panel. All programmable settings of the instrument
are performed in three adjusting modes:
LIGHT Simple programming menu
- contains solely items necessary for instrument setting and is protected by optional number code
PROFI Complete programming menu
- contains complete instrument menu and is protected by optional number code
USER User programming menu
- may contain arbitrary items selected from the programming menu (LIGHT/PROFI), which determine
the right (see or change)
- acces without password
All programmable parameters are stored in the EEPROM memory (they hold even after the instrument is switched off).
Complete instrument operation and setting may be performed via OM Link communication interface, which is a
standard equipment of all instruments.
The operation program is freely accessible (www.orbit.merret.eu) and the only requirement is the purchase of OML cable to
connect the instrument to PC. It is manufactured in version RS 232 and USB and is compatible with all ORBIT MERRET instru-
ments. Another option for connection is with the aid of data output RS 232 or RS 485 (without the need of the OML cable).
The program OM LINK in „Basic“ version will enable you to connect one instrument with the option of visualization and archiving
in PC. The OM Link „Standard“ version has no limitation of the number of instruments connected.
2.3 OPTIONS
Excitation is suitable for supplying power to sensors and transmitters. It has a galvanic separation.
Comparators are assigned to monitor one, two, three or four limit values with relay output. The user may select limits regime:
LIMIT/DOSING/FROM-TO. The limits have adjustable hysteresis within the full range of the display as well as selectable delay
of the switch-on in the range of 0…99,9 s. Reaching the preset limits is signalled by LED and simultaneously by the switch-on
of the relevant relay.
Data outputs are for their rate and accuracy suitable for transmission of the measured data for further projection or directly into
the control systems. We offer an isolated RS232 and RS485 with the ASCII, MESSBUS, MODBUS - RTU or PROFIBUS protocol.
Analog outputs will find their place in applications where further evaluating or processing of measured data is required in
external devices. We offer universal analog output with the option of selection of the type of output - voltage/current. The value
of analog output corresponds with the displayed data and its type and range are selectable in Menu.
Measured data record is an internal time control of data collection. It is suitable where it is necessary to register measured
values. Two modes may be used. FAST is designed for fast storage (100 records/s) of all measured values up to 8 000 records.
Second mode is RTC, where data record is governed by Real Time with data storage in a selected time segment and cycle. Up to
266 000 values may be stored in the instrument memory. Data transmis sion into PC via serial interface RS232/485 and OM Link.

6| INSTRUCTIONS FOR USE OM 502
3. INSTRUMENT CONNECTION
The instrument supply leads should not be in proximity of the incoming low-potential signals.
Contactors, motors with larger input power should not be in proximity of the instrument.
The leads into the instrument input (measured quantity) should be in sufficient distance from all power leads and appliances.
Provided this cannot be secured it is necessary to use shielded leads with connection to ground (bracket E).
The instruments are tested in compliance with standards for use in industrial area, yet we recommend to abide by the above
mentioned principles.
MEASURING RANGES
TYPE INPUTS I INPUTS U
DC ±999,99 A; ±9,9999 mA; ±99,999 mA;
±999,99 mA; ±5,0000 A
±999,99 mV; ±999,99 mV; ±9,9999 V;
±99,999 V; ±300,00 V
PM 0…5/20 mA/4…20 mA ±2/±5/±10 V
I0…5/20 mA/4…20 mA ±2/±5/±10 V
LX 0…5/20 mA/4…20 mA ±2/±5/±10 V
DU Linear potentiometer (min. 500 )
T1…4 / 2…8 / 4…16 mV/V
Termination of RS 485 communication line
Full Significance Default Recomendation
1-2 connect L+ to (+) source terminalconnected
3-4 termination of line 120 Ohm disconnected connect at the end of line
5-6 connect L- to (-) source terminalconnected do not disconnect
RS 485 line should have a linear structure - wires (ideally shielded and twisted)
should lead from one device to another.
X3 - Termination of commuication line RS 485
X3
153

INSTRUCTIONS FOR USE OM 502 | 7
3.INSTRUMENT CONNECTION
-
-
-
+
+
+
+
-
54
8910
L
NPOWER SUPPLY
E
123
11 12 13
567 14 15 16 17
IV V VI
III II I
L4
L3
L2 L1
EXT. 1 EXT. 3 EXT. 2
RxD/L+
TxD/L-
GND
AO - I
AO - U
GND
ABC D E FGH
Shielding
Excitation
INPUT I
INPUT U
+
+
+
-
-GND
Shielding
DMS supply
INPUT
INPUT
DMS supply
Sense
Sense
OM 502DUOM 502T
OM 502DC, PM, I, L
X
Shielding
b
e
ABC D E FGH
+
-
-GND
E 1 C 2 E 2 C 1
Open collector
SSR
Open collector
C 3
E 4
C 4
E 3
3W 5W
ABC D E FGH
OM 502LVDT
Excitation value may be set by trimmer above
the terminal block no. 17
!
Signal „SENSE“ measures supply voltage on
tensionmeter upon 6-wire connection, for
4-wire connection join brackets B+C andF+G
directly on the instrument. Whenusing the
instrument in highly disturbing environemnt
we recommend using 4-wire connection.
!
Grounding on terminal block 3 has to be
connected at all times
!
Terminal block “Shielding” is designed for
connecting shielding of the supply lead (con-
nected only on the side of the instrument).
The “Shielding” and “GND” terminal blocks
MUST NOT be connected
!

8| INSTRUCTIONS FOR USE OM 502
3. INSTRUMENT CONNECTION
Example connection of a 2-wire sensor with current signal output powered by instrument’s excitation
Example connection of a 3-wire sensor with current signal output powered by instrument’s excitation
+
-
L
N
E
123 14 15 16 17
ABC D E FGH
+
+
-
-
(+)
(-)
INPUT - I
Excitation
Sensor (-)
Sensor (+)
+
-
L
N
E
123 14 15 16 17
ABC D E FGH
+
+
-
-
INPUT - I
Excitation
Output (+)
Supply (+)
Supply (+)
Output (+)
GND (-)
GND

INSTRUCTIONS FOR USE OM 502 | 9
INSTRUMENT CONNECTION 3.
Example connection of 3-wire sensor with voltage signal output powered by instrument’s excitation
+
-
L
N
E
123 14 15 16 17
ABC D E FGH
+
+
-
-
INPUT - U
Excitation
Output (+)
Supply (+)
Supply (+)
Output (+)
GND (-)
GND

10 | INSTRUCTIONS FOR USE OM 502
4. INSTRUMENT SETTING
SETTING
PROFI
For expert users
Complete instrument menu
Access is password protected
Possibility to arrange items of the USER MENU
Tree menu structure
SETTING
LIGHT
For trained users
Only items necessary for instrument setting
Access is password protected
Possibility to arrange items of the USER MENU
Linear menu structure
SETTING
USER
For user operation
Menu items are set by the user (Profi/Light) as per request
Access is not password protected
Optional menu structure either tree (PROFI) or linear (LIGHT)