DPR-145 User Manual V-3.0
(14.09.2016)
-1-
DPR-145
TEMPERATURE
PROTECTION RELAY
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PT100 INPUTS: 4
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RELAY OUTPUTS: 4
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RS-485 MODBUS PORT
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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
