Datakom DPR-145 - User Manual

DPR-145 User Manual V-3.0 (14.09.2016)
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DPR-145
TEMPERATURE
PROTECTION RELAY
▪ PT100 INPUTS: 4
▪ RELAY OUTPUTS: 4
▪ RS-485 MODBUS PORT
▪ UNIVERSAL SUPPLY
DPR-145 is a precision unit designed for the
temperature protection of dry type or resin filled
MV transformers. The unit offers a high degree of
protection against electromagnetic disturbances.
The unit has 4 temperature inputs of PT100 type.
Three of them are used for the transformer
protection. The fourth input may be used as core
temperature protection or ambient temperature
monitoring.
Alarm and trip levels of the unit are independently
adjustable for first 3 sensors and the fourth
sensor input.
Alarm levels are adjusted using the program
mode. If no operation is performed, then the unit
will exit program mode in 3 minutes.
The unit offers a cable compensation function in
order to prevent long cables from impairing the
measurement precision.
The unit has 4 dry contact relay outputs rated 6A.
FAN: provides cooler fan control
TRIP: high temperature failure relay
ALARM: pre-alarm relay
FAULT: sensor or internal failure indicator
The unit offers an automatic self test feature. The
self test consists on the verification of sensor
inputs and internal memory integrity.
The standard isolated RS-485 MODBUS RTU
communication port is not affected by ground
potential differences and allows safe transfer of
information to remote management and
automation systems.
The supply input is isolated from sensor
connections.
1 degrees C measurement precision
4 x PT100 analog inputs
Allows cable length compensation
Automatic detection of sensor failures
Automatic and manual self test
4 x relay outputs, 5A/250Vac
Fully isolated RS-485 serial port
MODBUS-RTU communication
Recording of maximum temperatures
Front panel programmable
2 alarm thresholds for channels 1-2-3
2 alarm thresholds for channel 4
Easy to read, 3 digit 14mm led display
Supply voltage range: 19-400VDC (85-305VAC)
Reduced panel depth, easy to install
Wide operating temperature range, -20 to +70°C
Sealed front panel (IP65 with gasket)
2 part connection system
DESCRIPTION
FEATURES

Summary

Product Description

Key Features

Safety Notice

Installation Guide

Front and Rear Panel Overview

Overview of the front and rear panel components and their layout.

Mechanical Installation

Details on how to physically install the unit into a panel.

Electrical Installation

Guidance on making electrical connections to the unit.

Pushbutton Functions

Displays and Modes

Operating Modes

Explanation of the different operating modes (SCAN, AUTO, MAN, MAX) and their functions.

Alarms and Notifications

Alarm Menu Navigation

How to access and navigate the alarm menu to view fault, trip, and alarm messages.

Programming and Configuration

Entering Program Mode

Steps to access the programming mode for parameter adjustment.

Lamp Test Procedure

Procedure for performing a lamp test to verify LED functionality.

Relay Test Procedure

How to test the functionality of the unit's relays.

Modifying Program Parameters

Guide on how to change parameter values using the control buttons.

Program Parameter List

A list of all programmable parameters with their descriptions and ranges.

Modbus Communication

Modbus Description

Overview of the unit's serial communication capabilities via RS-485 MODBUS RTU.

Modbus Program Parameters

Detailed list of Modbus registers for programming parameters.

Modbus Commands

Specific Modbus commands for controlling the unit's functions.

Modbus Alarm Bits

Modbus registers representing the status of various alarm conditions.

Technical Specifications

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features
5. Safety Notice

The DPR-145 is a precision temperature protection relay designed for dry-type or resin-filled MV transformers, offering robust protection against electromagnetic disturbances.

Function Description:

The unit features four PT100 temperature inputs. Three inputs are dedicated to transformer protection, while the fourth can be used for core temperature protection or ambient temperature monitoring. It provides independently adjustable alarm and trip levels for all four sensor inputs. The device continuously monitors for abnormal conditions and programmable alarm limits are provided for every measured value. If a fault occurs, the corresponding alarm LED (TRIP, FAULT, or ALARM) illuminates, an alarm code is displayed, and the alarm relay operates. Even after an alarm clears, the LED remains on, though the relay output deactivates. Pressing the MODE button clears the alarm display and resumes normal operation. The unit also includes a FAN output for cooler fan control, a TRIP relay for high temperature failures, an ALARM relay for pre-alarms, and a FAULT indicator for sensor or internal failures. A cable compensation function prevents long cables from impairing measurement precision.

Important Technical Specifications:

• Supply Input: 19-400VDC (85-305VAC)
• Measuring Inputs: 4 x PT100 (3 terminals)
• Accuracy: 1% + 1 digit
• Measurement Range: -40 to +250°C
• Power Consumption: < 4 VA
• Relay Outputs: 4 dry contact relays, rated 5A @ 250V AC
• Serial Port: RS-485, Modbus RTU protocol
• Data Rate: 2400-115200 baud, adjustable
• Isolation: 1000V AC, 1 minute
• Operating Temperature Range: -20°C to +70°C (-4°F to 158°F)
• Max Relative Humidity: 95% non-condensing
• Protection: IP65 (front panel with gasket), IP30 (back panel)
• Enclosure: Flame retardant, RoHS compliant, high temperature ABS/PC (UL94-V0)
• Dimensions: 102x102x53mm (WxHxD)
• Panel Cut-out: 92x92mm
• Weight: 200 gr (approx)
• EU Directives: 2014/35/EC (LVD), 2014/30/EC (EMC)
• Reference Standards: EN 61010 (safety), EN 61326 (EMC)

Usage Features:

The DPR-145 offers a range of user-friendly features:

• Measurement Precision: 1 degree C accuracy.
• Cable Length Compensation: Allows for accurate readings even with long sensor cables.
• Sensor Failure Detection: Automatic detection of sensor failures.
• Self-Test: Automatic and manual self-test functions verify sensor inputs and internal memory integrity.
• Relay Outputs: Four relay outputs (5A/250Vac) for various control functions.
• Isolated Serial Port: Fully isolated RS-485 serial port with MODBUS-RTU communication for reliable data transfer to remote management and automation systems, unaffected by ground potential differences.
• Maximum Temperature Recording: Records maximum temperatures for each channel.
• Front Panel Programmability: All parameters are programmable directly from the front panel.
• Display: Easy-to-read 3-digit, 14mm LED display.
• Supply Voltage Range: Wide operating supply voltage range (19-400VDC, 85-305VAC).
• Installation: Reduced panel depth for easy installation.
• Operating Modes: Four operating modes: SCAN (displays channel temperatures, switches every 5 seconds), AUTO (displays the highest channel temperature), MAN (displays selected channel temperature, scrollable), and MAX (displays maximum recorded temperature for selected channel, scrollable).
• Alarm Menu: Accessible by holding the MODE button for 5 seconds, allowing users to view different alarm types (fault, trip, alarm) and scroll through alarms on different channels.
• Programming Mode: Allows modification of various parameters such as cable section, cable length, alarm limits, trip limits, fan channel selection, fan ON/OFF temperatures, alarm enable parameters, RS-485 data rate, and Modbus node address.
• Relay Test: Enables testing of TRIP, FAULT, ALARM, and FAN relays.

Maintenance Features:

• Lamp Test: Performed automatically for 5 seconds when exiting PROGRAM mode, illuminating all LEDs to verify functionality.
• Non-Volatile Memory: Parameters are stored in non-volatile memory, ensuring they are retained even after power failures.
• Error Codes: Provides specific error codes (illegal function code, illegal address, write protection) for troubleshooting Modbus communication issues.

Safety Notice:

• Installation should only be performed by qualified specialists.
• The unit must be checked for cracks or damage from transportation before installation.
• Do not open the unit; there are no serviceable parts inside, and opening voids the warranty.
• A fast-type fuse with a maximum rating of 6A must be connected to the power supply input, in close proximity to the unit.
• All power must be disconnected before working on the equipment.
• Do not touch terminals when the unit is connected to the network.
• All electrical parameters applied to the device must be within the specified range in the user manual.
• Clean the device only with a dry cloth; do not use solvents.
• Verify correct terminal connections before applying power.
• The unit is designed for front panel mounting only.
• Avoid installing the unit near high electromagnetic noise-emitting devices (contactors, high current busbars, switchmode power supplies) to prevent operational issues, measurement inaccuracies, and data communication quality degradation.
• Always remove plug connectors when inserting wires with a screwdriver.
• Use cables of appropriate temperature range and adequate section (at least 0.75mm² / AWG18).
• For RS-485 connections, use appropriate shielded twisted wire cable for optimal communication quality.
• The difference between Alarm and Trip temperatures for any channel cannot be less than 5°C, and Trip temperature must always be higher than Alarm temperature.
• Similarly, the difference between Fan Turn ON and Turn OFF parameters cannot be less than 5°C, and Fan Turn ON must always be higher than Fan Turn OFF.

Datakom DPR-145 Specifications