Overview
Dual Source Energy Measurements
Rish EM 3490 DS features two energy integrator Utility & Generator. In normal operation meter accumulates energy counts in utility register & when utility shutdowns and control input signal of (10 to 60V DC/ 20 to 300V AC) is present on generator sensor energy starts accumulating in Generator register.
On site programmable PT/CT ratios
It is possible to program primary of external potential Transformer (PT), primary of external Current Transformer (CT) on site locally via front panel keys by entering into Programming mode or remotely via MODBUS (RS485)
User selectable PT Secondary
The secondary of external potential Transformer (PT) can be programmed on locally via front panel keys by entering into Programming mode or remotely via MODBUS (Rs485)
User selectable 3 phase 3W or 4W
User can program on site the network connection as either 3 Phase 3 Wire or 4 Wire locally via front panel keys by entering into Programming mode or remotely via MODBUS (RS485). For single phase applications, single phase version is available.
Low back depth
The instrument has very low back depth (behind the panel) of less than 80 mm in spite of optional features like pulse output Onsite
Selection of Auto scroll / Fixed Screen
User can set the display in auto scrolling mode or fixed screen mode locally via front panel keys by entering into Programming mode or remotely via MODBUS (RS485).
True RMS measurement
The instrument measures distorted waveform up to 15th Harmonic.
High brightness 2 line 7 digits LED display
Simultaneous displays Utility and Generator parameters.
Parameter Screen recall
In case of power failure, the instrument memorizes the last displayed screen. The displayed screen will get memorized only if user keeps this screen for minimum 40 sec duration before power failure for fixed screen mode.
User Assignable Registers for MODBUS
Customer can assign MODBUS register address as per his need for faster response time.
Energy Count storage
In case of power failure, the instrument memorizes the last energy count. Every 40 sec, the instrument updates the energy counter in the non-volatile memory.
Hour Run, ON Hour, Number of Interruptions
Hour run records the number of hours load is connected. ON Hour is the period for which the auxiliary supply is ON. Number of Interruptions indicates the number of times the Auxiliary Supply was interrupted. All these parameters are displayed in both utility & generator mode.
Old Register
This register holds the value before the last reset. The old value will be available when scrolled through screen.
Optional MODBUS (RS485) Output
The optional ModBus output enables the instrument to transmit all the measured parameters over standard MODBUS (RS485).
Optional Pulse Output
The instrument has optional pulse output one for Utility and another for Generator. The optional pulse output is a potential free, very fast acting relay contact which can be used to drive an external mechanical counter for energy measurement.
Configuration of the Instrument via MODBUS
The instrument settings can be configured locally via front panel keys by entering into Programming mode or remotely via MODBUS (RS485).
Note: The MODBUS communication parameters can only be set locally via front panel keys in the Programming mode.
Enclosure Protection for dust and water
Conforms to IP 54 (front face) as per IEC60529
Compliance to International Safety standards
Compliance to International Safety standard IEC 61010-1- 2001
EMC Compatibility
Compliance to International standard IEC 61326.
