Dinel PDU–420–W Programmable Display

programmable display unit PDU–420–W

Table of Contents

Description

Dinel PDU–420–W Programmable Display is equipped with one current input 0-20 / 4-20mA and one voltage input 0-5 / 1-5 / 0-10 / 2-10V. The current input has an additional overcurrent protection circuit, which protects the standard resistors. The selection of active input is realized by software, and selected input can be changed at any time.

Additionally, the PDU-420-W allows users to select a conversion characteristic of several kinds: linear, square, square root, user-defined (max.20 points length), and volume characteristics of a cylindrical tank in the vertical and horizontal position. The result is shown on the 4-digit LED display.

The PDU-4×0-W meter is equipped with one current input 0-20 / 4-20mA and one voltage input 0-5 / 1-5 / 0-10 / 2-10V. Current input has additionally overcurrent protection circuit, which protects standard resistor. The selection of active input is realised by software, and selected input can be changed at any time. Additionally the PDU-4×0-W allows user to select a conversion
characteristic of several kinds: linear, square, square root, user defined (max.20 points length)
and volume characteristics of a cylindrical tank in the vertical and horizontal position. Result is
showed on 4-digit LED display. Displayed values range can be selected by user, from -999 to
9999, plus decimal point.
Depending on version the device can be equipped with: two relay outputs, two OC type outputs,
one relay and one passive isolated current output or one OC type and one passive isolated current output. Device PDU-4×0-W is equipped with RS-485 / Modbus RTU communication interface
and sensor supply output. The meter can be ordered in two power supply versions.
The device has 4 buttons being used for main presets programming. To get high protection level,
the keyboard is mounted under transparent cover. To allow user to change presets without opening the cover, an IR sensor is mounted. Remote controller keyboard is equivalent to the device
keyboard (Note, that remote controller is not a part of the PDU-4×0-W set – it is an additional
equipment).

Dinel PDU–420–W Features

  • Suitable for connecting water level meters with a current or voltage output.
  • 4–digit LED display.
  • 2 relay outputs
  • Includes an auxiliary voltage power supply for current loop 4 … 20 mA.
  • Wall-mounted case (IP65).
  • Communication interface RS–485 / Modbus RTU.
  • Power supply 230 V AC or 24 V DC.

Electrical Connection

The unit is not equipped with an internal fuse or power supply circuit breaker. Because of this, an external time-delay cut-out fuse with a small nominal current value must be used (recommended bipolar, max. 2A), and a power supply circuit breaker located near the unit. In the case of using a monopolar fuse, it must be mounted on the phase cable (L).

The power supply network cable diameter must be selected in such a way that in the case of a short circuit of the cable from the side of the unit the cable shall be protected against destruction with an electrical installation fuse.

Note: In case of measurement (evaluation) of the values from the level meter located in areas with an explosion hazard, it is necessary to install an isolating repeater between the PDU display unit and the level meter.

Range of application

The unit is designed to be coupled with the level meter, which is connected via current or voltage output. The unit continually displays level in any physically units, according to selected limits, it can control switching of connected equipment (pumps, valves etc.) and it can be used as power supply for level meters too.

Mechanical mounting

The unit is not equipped with an internal fuse or power supply circuit breaker. Because of this an external time-delay cut-out fuse with a small nominal current value must be used (recommended bipolar, max. 2A) and a power supply circuitbreaker located near the unit. In the case of using a monopolar fuse it must be mounted on the phase cable (L).
The power supply network cable diameter must be selected in such a way that in the case of a short circuit of the cable from the side of the unit the cable shall be protected against destruction with an electrical installation fuse. Wiring must meet appropriate standards and local regulations and laws. In order to secure against accidental short circuit the connection cables must be terminated with appropriate insulated cable tips. Tighten the clamping screws. The recommended tightening torque is 0.5 Nm. Loose screws can cause fire or defective operation. Over tightening can lead to damaging the connections inside the units and breaking the thread. Due to possible significant interference in industrial installations appropriate measures assuring correct operation of the unit must be applied. To avoid the unit of improper indications
keep recommendations listed below.

  • Avoid running signal cables and transmission cables together with power supply cables and cables controlling inductive loads (e.g. contactors). Such cables should cross at a right angle.
  • Contactor coils and inductive loads should be equipped with interference protection systems, e.g.
    RC-type.
  • Use of screened signal cables is recommended. Signal cable screens should be connected to the
    earthing only at one of the ends of the screened cable.
  • In the case of magnetically induced interference the use of twisted pair of signal cables is recommended. Twisted pair (best if shielded) must be used with RS-485 serial transmission connections.
    • In the case of measurement or control signals are longer than 30m or go outside of the building
    then additional safety circuits are required.
    • In the case of interference from the power supply side the use of appropriate interference filters
    is recommended. Bear in mind that the connection between the filter and the unit should be as
    short as possible and the metal housing of the filter must be connected to the earth with the largest possible surface. The cables connected to the filter output must not be run with cables with
    interference (e.g. circuits controlling relays or contactors).

Dinel PDU–420–W Specification

Location panel version
Power supply voltage
version 230 V 230 V AC ± 10%
version 24 V 24 V DC ± 15%
Power consumption
version 230 V 2,6 VA
version 24 V 4,5 W
Voltage input current 0/4 … 20 mA (limited input current to 40 mA)
voltage 0/1 … 5 V; 0/2 … 10 V
Voltage input resistance < 65 Ω (current input)
> 50 kΩ (voltage input)
Display range  -999 – 9999, plus decimal point
Voltage measurement accuracy  ± 0,25 %
(± one digit over the entire measuring range)
Display 4-digit, seven-segment, LED, red
Outputs relay 2 (relay 1 A / 250 V AC)
Sensor power supply outputs
 version 230 V 24 V DC ± 3 V, max. 25 mA
version 24 V 24 V DC ± 15%, max. 100 mA
Outputs
Communication interface RS–485, 8N1 and 8N2, Modbus RTU, no galvanic separation
Baud rate  1 200 … 115 200 bit/s
Operating temperature 0 … + 50°C; (-20 … +50°C) *
Storage temperature  -10 … + 70°C; (-20 … +70°C) *
Protection IP65
Housing material ABS + fiberglass
Weight cca 340 g

Download Catalog: Programmable display unit PDU–420–W, Dinel-Level and Flow Measurement

Ref: Dinel.cz

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