1 Preliminary note This document applies to the level control relay DL0203� This document is intended for specialists� These specialists are people who are qualified by their training and their experience to see risks and to avoid possible hazards that may be caused during operation, installation or maintenance of the device�...
2 Safety instructions 2.1 General Follow the operating instructions� Non-observance of the instructions, operation which is not in accordance with use as prescribed below, wrong installation or incorrect handling can affect the safety of operators and machinery� The installation and connection must comply with the applicable national and international standards�...
2.4 Handling Be careful when handling the unit once power is applied� This is only allowed by qualified personnel due to the protection rating IP 20� 2.5 Installation location For the correct operation the device must be mounted in a housing which can only be opened using a tool or in a locked control cabinet (both protection rating IP 54 or higher) as an enclosure in accordance with EN 61010�...
3 Functions and features The device is used to keep a medium level between 2 sensors� To do so it controls the inlet of a tank (e�g� valve or pump)� It receives signals from 2 external sensors and switches its outputs according to the adjustable input delay�...
3.1 Functionality In 1 In 2 Level control 1: Sensor 1 with normally closed output for input 1 (upper level) 2: Sensor 2 with normally open output for input 2 (lower level) 3: Tank with liquid or dry bulk material 4: Valve or pump (inlet) 5: Relay output 6: Transistor output...
3.1.1 Switching diagram Level t [s] Sensor 1 Sensor 2 Power Output = relay energised, i�e� switched (transistor output switched) 1: Level of the medium 2: Sensor 1 with normally closed output for input 1 (upper level) 3: Sensor 2 with normally open output for input 2 (lower level) 4: Power supply 5: Output Switch point sensor 1 (upper level)
4 Operating and display elements Operating and display elements 1: LEDs 2: Potentiometer 3: Panel for labelling 4.1 LEDs Colour Status Description Power Green Voltage supply OK Input 1 Yellow Input 1 signal "High" Output Green Relay energised (transistor switched) Input 2 Yellow Input 2 signal "High"...
5 Installation 5.1 Installation of the device ► Install the device on a 35 mm DIN rail� ► Leave enough space between the unit and the top and bottom of the control cabinet to enable air circulation and to avoid excessive heating� ►...
6 Electrical connection 6.1 Connection accessories The unit is supplied including connectors� You can find more information about the available accessories at: www.ifm.com → Data sheet search → Article number → Accessories 6.2 Terminal connection Power 01 02 03 04 05 06 07 08 21 22 23 24 1 2 3 4...
6.3 Voltage supply (power) ► Voltage supply see type label� ► Connect the device only to one of the possible voltage connections, i�e� either to terminals 21/22 and 23/24 (AC) or to terminals 1/2 and 3/4 (24 V DC)� ► Lay all supply and signal cables separately� Use a screened cable if required in the application�...
6.4 Inputs 6.4.1 General The assignment of the sensors to the inputs is predetermined� Input 1 = sensor 1 with normally closed output (upper level) Input 2 = sensor 2 with normally open output (lower level) The connection of mechanical switch contacts is not recommended since they tend to bounce and produce faulty pulses�...
6.5 Outputs 6.5.1 Relay output ► Connect the changeover contact depending on the used valve or pump (→ 6.6 Connection of the valve or pump)� ► To prevent excessive wear and to comply with the EMC standards, interference suppression of the contacts is required for switching inductive loads� WARNING If the device is operated on an AC supply (terminals 21/22 and 23/24) this must use the same supply cable (phase) as the voltage supply to switch an AC...
7 Settings ► Set the continuously adjustable potentiometer using a suitable screwdriver� 7.1 Input delay The input delay sets the minimum duration of the stable input signal to be evaluated� It protects against unintended switching caused by waves on a medium surface� Value 0…10 s...
8 Scale drawing 25,4 109,1 9 Technical data Level control relay DL0203 Nominal voltage AC 110����240 Nominal frequency [Hz] 50����60 Voltage tolerance -20/+10 Power consumption Alternatively Nominal voltage DC 27 (typ� 24) Voltage tolerance -20/+10 Power consumption Auxiliary energy for sensors 18.5...30 DC SELV, ≤...
Level control relay DL0203 Relay contact rating Resistive load (240 V AC or 24 V DC) Electrically isolated Reinforced insulation to EN 61010 Overvoltage category II, Degree of soiling 2 to 240 V AC nominal voltage Transistor switching voltage 10…30 DC SELV Transistor current rating [mA] ≤...
10 Troubleshooting Error Troubleshooting Sensor wire break or wrong Check sensors and their sensor type connections Short circuit at sensor supply Remove short circuit Short circuit at transistor output Remove short circuit Internal device error Contact service Legend: flashing 11 Maintenance, repair, disposal 11.1 Maintenance The unit is maintenance-free�...
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