NIVELCO NIVOSONAR SLM-308 User manual

Thank you for choosing a NIVELCO instrument.
We are sure that you will be satisfied throughout its use.
GENERAL
The NIVOSONAR SLM-308 Scanner is a panel mount equipment used in the
NIVOSONAR Two-part Ultrasonic Measurement Systems for scanning up to
8 identical S-300 SenSonar Sensors for the SMM/SMZ-300 Remote Control Unit.
TECHNICAL DATA
Type SLM-308
Sensor connection max. 8, identical S-300 SenSonar sensors
“POLLED SENSOR” output LO= 0...2 V, 1.6 mA, HI= 6...8 V, 1.6 mA
Supply voltage 24V, 110V, 230 V AC, 50…60 Hz, -10…+10%
Power consumption < 35 VA
Power supply for sensors 24 V, max. 600 mA DC
Ambient temperature 0... +50°C
Connecting cables 0.5 - 2.5 mm2shielded cable with plug-in terminal
Electrical protection Class II.
Mechanical protection Front side: IP40, Rear side: IP20
Weight 1.25 kg
USER’S MANUAL
Manufacturer:
NIVELCO Process Control Co.
H-1043 Budapest, Dugonics u. 11.
Tel.: [phone] Fax: [phone]
E-mail: [e-mail] http://www.nivelco.com
OPERATION
The NIVOSONAR SLM-308 Scanner works as a multiplexer
for the Remote Control unit.
All sensors receive the power supply and the “FIRE” signals
making them able to emit ultrasonic signals continuously.
The Remote Control Unit can process one sensor at a time,
thus only one “PRE” signal is forwarded to the controller at a
time.
The complete processing time required for a sensor is
between 5 and 12 sec, depending on the measuring
frequency.
The control unit can be programmed for manual or automatic
scanning (see later).
The scanner has a status indication LED beside each
sensors name on its front panel:
•The illuminated LED indicates the sensor to which
the display and the current output corresponds.
The display and current output corresponds to
the sensor until the LED is illuminated.
•The blinking LED indicates the sensor that is
currently under processing by the control unit.
•In automatic scanning mode, one LED is always
illuminated (outputs corresponds to this sensor),
while another is blinking (this sensor is under
processing).
Removing the front panel, the tag-number plates can be
accessed for labelling each tank.

PRE
FIRE
+24 V
GND
1
PRE
FIRE
+24 V
GND
2
PRE
FIRE
+24 V
GND
8
1
2
3
4
5
6
7
8
CONTROL
CIRCUIT
CLR
CLK
“POLLED SENSOR” DIGITAL OUTPUT
FIRE
PRE
A
NALOGUE
OUTPUT
(4-20 mA)
RS 485
INTERFACE
SenSonar
Sensors Junction box
SLM-308
Scanner
SMM/SMZ-300
Remote Control Unit
RELAY
OUTPUT
POWER SUPPLY
FOR SENSORS
Figure 1. The principle of operation
Using the RS485 interface
Data acquisition:
Measurement values of each sensor can be accessed
individually any time.
Measurement values of all the sensors connected to the SLM-
308 can be read-out in one telegram.
Remote programming:
The Remote Control Unit can be programmed remotely.
Using the single current output of the Remote Control
Unit
To utilise the single current output for the entire measuring
system, an additional hardware is needed (ex.: PLC), since
the current output will contain measurement values of all
sensors, sequentially, see figure below.
20 mA
Iout
TIME
4 mA
Sensor1Sensor2Sensor3Sensor4Sensor1Sensor2
In order to de-multiplex the current output signal, the scanner
provides an “address” signal, coded on 3 bits at the “POLLED
SENSOR” output.
The “POLLED SENSOR” always decodes the sensor for
which the current output is valid.

Polled Sensor D2 (22)D1 (21)D0 (20)
Sensor 1 0 0 0
Sensor 2 0 0 1
Sensor 3 0 1 0
Sensor 4 0 1 1
Sensor 5 1 0 0
Sensor 6 1 0 1
Sensor 7 1 1 0
Sensor 8 1 1 1
“POLLED SENSOR” output:
LO (0)= 0...2 V, 1.6 mA
HI (1)= 6...8 V, 1.6 mA
Programming
While programming the Remote Control Unit, the following
parameters should be set:
P61: - - - x Number of sensors connected to the SLM-308
Maximum 8 sensors, the factory default value of this
parameter is: 0
P62: - - - x Scanning Mode
The Scanning Mode of sensors is to be set here.
XScanning Mode
0Manual, with the [STEP] key
1Automatic
In Manual Scanning Mode only one Sensor (selected
manually by the [STEP] key of Remote Control Unit) will be
processed.
In automatic scanning mode the sensors carry out
measurements one after the other with a fixed interval.
Measurement time required for a sensor is between 5 and 12
sec, depending on the measuring frequency.
Note: Even in Automatic Scanning Mode any sensor can also
be selected manually with the [STEP] key. However after the
Remote Control Unit has processed the manually selected
sensor, it will continue the scanning automatically.
SSB-344
PLC
0/4...20mA
RS485
SLM-308 SMM-340
Monitoring the level in several identical H2SO4tanks
PLC
0/4...20mA
RS485
SMM-340
SLM-308
SID-310
Monitoring the level in several identical 40 m high grain silos
DIMENSIONS
ACCESSORIES
•User’s Manual
•1 x 2-pole mains screw terminal
•1 x 11-pole screw terminal for sensor signals
•1 x 5-pole screw terminal for the Remote Control Unit
•1 x 4-pole screw terminal for “POLLED SENSOR” output
WIRING
The use of a junction box is recommended.
Wiring between Sensors and Junction Box
•Use 4-wire shielded cables (except SID-10-H) for
extending the signal cable of the sensors.
•Connect shielding of signal cable to the “GND” wire at
the Junction Box side.
Wiring between Scanner and Junction Box
Use individually shielded cables for all “PRE” signals.
The “FIRE”, “GND” and “+Us” signals can be led in a
common, shielded wire.
The shielding of the above cables should be grounded where
the Scanner and the Remote Control Unit are grounded.
The “FIRE”, “GND” and “+Us” signals should be distributed in
the junction box to as many terminals as the number of
connected sensors.

JUNCTION BOX
SLM - 308 SCANNER
SMM/SMZ-300J
REMOTE CONTROL UNIT
+Us
PRE2
FIRE
GND
+Us
PRE1
FIRE
GND
+Us
PRE3
FIRE
GND
+Us
PRE4
FIRE
GND
+Us
PRE5
FIRE
GND
+Us
PRE6
FIRE
GND
+Us
PRE7
FIRE
GND
+Us
PRE8
FIRE
GND
SenSonar 5
SenSonar 2
SenSonar 3
SenSonar 4
SenSonar 1
SenSonar 6
SenSonar 7
SenSonar 8
GND
SYNC
CLK
CLR
GND
5
6
7
8
9
S
22
21
20
19
16
12
15
14
11
2
1
3
33
32
31
3
28
29
2
27
25
23
124
RS485
250V 5A
PRE
FIRE
GND
TRD+
TRD -
+U
COMMON
MAINS
ICos =1
MAINTENANCE AND REPAIRS
The device does not require routine maintenance. In some
instances, however, the sensor probe may need occasional
cleaning to remove surface deposits.
STORAGE CONDITIONS
Environmental temperature range: -30 to +70°C
Relative humidity:up to 98%
WARRANTY
All Nivelco products are warranted free of defects in
materials or workmanship for a period of two years from the
date of purchase. Repairs under guarantee are carried out at
the Manufacturer's premises. The Purchaser is liable for
costs of dismantling and re-installation as well as transport
costs.
Nivelco shall not be liable for misapplication, labour claims,
direct or consequential damage or expense arising from the
installation or use of equipment.
slm3081a0601h
17.05.99.