Vega VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) Modbus and Levelma Bedienungsanleitung Seite 28
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5 Connecting to power supply and bus system
VEGAPULS 62 • Modbus and Levelmaster protocol
41362-EN-121011
5 Connecting to power supply and bus
system
5.1 Preparing the connection
Always keep in mind the following safety instructions:
•
Connect only in the complete absence of line voltage
•
If overvoltage surges are expected, overvoltage arresters should
be installed
The instrument requires an operating voltage of 8 … 30 V DC. Operat-
ing voltage and digital bus signal are carried on separate two-wire
connection cables.
The instrument is connected with standard two-wire, twisted cable
suitable for RS 485. If electromagnetic interference is expected which
is above the test values of EN 61326 for industrial areas, screened
cable should be used.
Use cable with round cross-section. A cable outer diameter of
5 … 9 mm (0.2 … 0.35 in) ensures the seal eect of the cable gland.
If you are using cable with a dierent diameter or cross-section,
exchange the seal or use a suitable cable gland.
Make sure that the entire installation is carried out according to the
Fieldbus specication. In particular, make sure that the bus is termi-
nated with suitable terminating resistors.
With plastic housing, the NPT cable gland or the Conduit steel tube
must be screwed without grease into the threaded insert.
Max. torque for all housings see chapter "Technicaldata"
With systems with potential equalisation, connect the cable screen
directly to ground potential at the power supply unit, in the connection
box and at the sensor. The screen in the sensor must be connected
directly to the internal ground terminal. The ground terminal outside
on the housing must be connected to the potential equalisation (low
impedance).
In systems without potential equalisation, connect the cable screen
directly to ground potential at the power supply unit and at the sensor.
In the connection box or T-distributor, the screen of the short stub to
the sensor must not be connected to ground potential or to another
cable screen. The cable screens to the power supply unit and to the
next distributor must be connected to each other and also connected
to ground potential via a ceramic capacitor (e.g. 1 nF, 1500 V). The
low frequency potential equalisation currents are thus suppressed,
but the protective eect against high frequency interference signals
remains.
5.2 Connecting
The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
Safety instructions
Voltage supply
Connection cable
Cable gland ½ NPT
Cable screening and
grounding
Connection technology
- Operating Instructions 1
- VEGAPULS 62 1
- Quick start 2
- Contents 4
- 1 About this document 6
- 2 For your safety 7
- 2.5 CE conformity 8
- 2.6 NAMUR recommendations 8
- 2.7 Radio license for Europe 8
- 3 Product description 10
- 3.2 Principle of operation 11
- 4 Mounting 14
- 4 Antenna 15
- > 200 mm 17
- > 10 mm 18
- (0.39") 18
- Fig. 19: Agitators 21
- (1.97") 25
- 1 Position sensor 27
- 2 Venturiume 27
- 5.1 Preparing the connection 28
- 5.2 Connecting 28
- 4...20mA 30
- 6.1 Adjustment volume 32
- 6.3 Adjustment system 33
- 6.4 Parameter adjustment 33
- 7.1 Connect the PC 47
- 8.1 Maintenance 50
- 1 Failure - red 51
- 2 Function check - orange 51
- 4 Maintenance - blue 51
- 8.4 Rectify faults 54
- 41362-EN-121011 56
- 8.6 Software update 58
- 9 Dismounting 59
- 10 Supplement 60
- 1 Reference plane 61
- 3 Antenna length 61
- 4 Useful measuring range 61
- 2 Antenna edge 62
- 10.2 Basics Modbus 66
- 10.2 Bus description 66
- 10.2 Bus architecture 66
- 10.2 Protocol description 67
- 10.3 Modbus register 68
- 10.3 Holding Register 68
- 10.3 Input register 68
- 10.4 Modbus RTU commands 70
- 10.4 FC4 Read Input Register 71
- 10.4 FC8 Diagnostics 71
- 10.4 FC17 Report Slave ID 72
- 10.5 Levelmaster commands 73
- 10.5 Report Unit Number 74
- 10.5 Assign Unit Number 74
- 10.5 Set number of Floats 75
- 10.5 Set Baud Rate 75
- 10.5 Report Number of Floats 75
- 10.5 Error codes 76
- 485 on COM1 80
- 1 Standard 82
- 10.9 Trademark 87
- Printing date: 88
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