M-4272

M-4272 Digital Motor Bus Transfer System

For Low Voltage (LV) and Medium Voltage (MV) Switchgear Applications.

  • Provides Automatic and Manual transfers of motor bus systems in power plants and industrial processing plants to ensure process continuity
  • Automatically selects Fast, In-Phase, Residual Voltage, and Fixed Time motor bus transfers, based on varying system conditions
  • Applicable for one way and bi-directional Manual and Automatic transfers
  • Can be expanded to accommodate multiple breaker configurations
  • Multiple setpoint profiles for various application requirements
  • Integrated control, supervisory functions, sequence of events, and oscillograph recording in one device
  • Extensive commissioning tools, including ringdown analysis
  • Optional M-3919A Graphic Display Unit (GDU) and Touch Screen Human Machine Interface (HMI) for communicating with one or two M-4272 units
  • Optional M-5072 Retrofit Kit for M-4272 Replacement of M-0272/M-0236B Analog Transfer Logic Controller

Standard Features

Automatic Transfer: The digital Motor Bus Transfer System (MBTS) provides the following Automatic Transfer logic and features:

  • Transfer initiated by protective relay external to the MBTS
  • Automatic Transfer after a loss of the motor bus supply voltage based on the programmable undervoltage element. This provides a selectable backup feature if a manual or protective relay transfer is not initiated.
  • Fast Transfer with adjustable phase angle limit
  • In-Phase Transfer at the first phase coincidence if Fast Transfer is not possible
  • Residual Voltage Transfer at an adjustable low residual voltage limit if Fast Transfer and In-Phase Transfer are not possible
  • Fixed Time Transfer after an adjustable time delay
  • Programmable Load Shedding with no time delay for Fast Transfer
  • Programmable load shedding prior to initiating In-Phase Transfer, Residual Voltage Transfer, and Fixed Time Transfer
  • Adjustable setpoints for delta voltage limit and delta frequency limit
  • Verify the new source (the source to which the bus is being transferred) is healthy and within acceptable upper and lower voltage limits

Manual Transfer: When a Manual Transfer is initiated the digital MBTS provides the following:

  • Sync check functions with adjustable parameters
  • Hot Parallel Transfer if enabled (makebefore-break)
  • Fast Transfer, In-Phase Transfer, and Residual Voltage Transfer (if the Hot Parallel Transfer is disabled)
  • Programmable Load Shedding with no time delay for Fast Transfer
  • Programmable load shedding prior to initiating In-phase Transfer and Residual Voltage Transfer
  • Verify the new source (the source to which the bus is being transferred) is healthy and within acceptable upper and lower voltage limits

Circuit Breaker Control: The digital Motor Bus Transfer System includes the following Circuit Breaker Control features:

  • Control of two circuit breakers with two individual programmable breaker closing times
  • Three-breaker configuration can be provided by two M-4272 devices
  • Breaker status supervision
  • Breaker failure monitoring
  • Four trip and close circuit monitoring inputs

Additional Standard Features

  • Sequential or Simultaneous Transfer Mode
  • Bus Phase Undervoltage (27B)
  • Frequency (81) and Rate of Change of Frequency (81R) for load shedding
  • Instantaneous Phase Overload Detection Source 1 and 2 (50S1) (50S2)
  • Breaker Failure (50BF), Source 1 and Source 2
  • Bus VT Fuse-Loss Detection (60FL)
  • Auto Trip
  • Auto Close
  • Four dry output contacts (two trip and two close) for Source 1 and Source 2, one lockout/blocking output contact, and 11 programmable output contacts (10 Form ‘a’ and one Form ‘c’)
  • Six Breaker Status inputs (a, b, and service position) for the Source 1 and Source 2 breakers, twelve programmable digital inputs
  • All functions can be enabled or disabled
  • Remote/Local control selection
  • Device ON/OFF Control Selection
  • M-3931 Human-Machine Interface (HMI) Module
  • M-3972 Status Module
  • IRIG-B time synchronization
  • Oscillographic recording
  • Two RS-232 ports (front and rear) and one RS-485 port (rear)
  • S-4200 ISScom Communications and Oscillographic Analysis Software (firmware versions V.02.01.07 or later)

Optional Features

  • RJ45 Ethernet Port Utilizing MODBUS over TCP/IP Protocol or IEC 61850 Protocol
  • 5 A or 1 A models available
  • 60 Hz or 50 Hz models available
  • M-3919A Graphic Display Unit/Human Machine Interface
  • Available in vertical panel mount
  • M-5072 Retrofit Kit for M-4272 Replacement of M-0272/M-0236B Analog Transfer Logic Controller

 

Specification
Specification (Spanish)
Specification (French)

(Firmware V02.01.07 and Later)
Instruction Book
Instruction Book (Spanish)

(Firmware V02.00.XX and Earlier)
Instruction Book 

Protocols

Firmware V02.01.07 or newer
S-4200 ISSCom® Communications Software

Firmware between V01.01.00 and V02.00.10
M-3872 ISSCom® Communications Software

M-0423 10′ RS-232 Serial Null-Modem Cable

M-0433 10′ USB to Serial Adapter with RS 232 Serial Null-Modem Cable (DB9 to DB9)

M-3908 Universal Contact Input Adapter

M-3919A Graphic Display Unit/ Human Machine Interface

M-3933 10′ RS 232 Serial Modem Cable (straight through DB9 to DB25)

M-5072 Retrofit Kit for the Direct Replacement of the Analog M-0272 & M-0236B MBT System