KONGSBERG MRU-E-JB1 Host machine

KONGSBERG  MRU-E-JB1  Host machine

MRU product line continuation

End-of-life for older MRU

models

The blue Motion Reference Unit (MRU) models, serial numbers 19000 and

below, are now all obsolete and replaced by the following 5th generation

MRU models:

• MRU 5v

• MRU Hv

• MRU 3v (replacing MRU Z)

• MRU 2v

• MRUDv

• MRU E

As published in the End-of-life note of October 2012. support for these

older versions will be limited after November 2023.

As we have past this date, we kindly ask you to consider upgrading the

affected MRU version, as repair and recalibration of these units will now

be limited.

Junction Box

JB3 Junction Box

5th generation MRU and mounting bracket

The now discontinued 4th generation MRU was supplied

with the JB1 Junction Box. The new 5th generation MRU is

supplied with the JB3 Junction Box.

A new 5th generation MRU can be connected directly

to the older JB1. hence replacing the JB1 is not

needed. However, be aware that the COM2 and analog

outputs will not be available with the JB1. In addition,

configuration of the 5th generation MRU must be

done through the service kit (MRU-T-Configkit-V).

Brackets

The new 5th generation MRU is compatible with all

exisiting MRU mounting brackets from the 4th generation

MRUs.

Subsea bottles

The 5th generation MRU is physically shorter than the 4th

generation MRU. This means that you will not be able to

fit a new MRU into an old subsea bottle, hence these will

also have to be replaced.

Cables

Both generations of MRUs have the same physical

connector, hence cables do not directly need to be

replaced. Note: As functionality/interface has changed

between the two generations, please ensure that

connections are referred to the 5th generation MRU.

Note:

• Analog signals are not available directly from the 5th

generation MRU.

• Old subsea cables (MRU-E-CS4) are not compatible

with the new 5th generation MRU when Ethernet

communication is used.

Interfaces

Many output variable names have changed - please

consult the Installation Manual for the 5th generation

MRUs

Connector x

Input serial lines (AUX1. AUX2) (COM3. COM4) x

Cables for serial comm x

MRU Junction Box

MRU-E-JB1 x (serial comm.

only)

MRU-E-JB1P x (serial comm.

only)

MRU-E-JB2 x (serial comm.

only)

MRU-M-JB3 x

MRU Cables

MRU-E-CS1 (3. 5. 10. 15. 20. 30 m) x (serial comm.

only)

MRU-E-CS5 x

MRU-E-CS8 (3. 10. 30 m) x

MRU-E-CS10 (6. 10 m) x

MRU-E-DP1 (MRU D only) x (serial comm.

only)

MRU-E-DP2 (MRU D only) x

MRU-E-HYD (10. 20 m) x

MRU mounting brackets

MRU-M-MB1 x

MRU-M-MB3 x

MRU-M-MB4 x

MRU-M-MB5 x

MRU-M-MB6 x

MRU cables subsea

MRU-E-CS4 x

MRU-E-CS7 (15. 30. 45 m) x

MRU-E-CS9 (15. 30. 45 m) x

MRU subsea bottles

MRU-M-SB5 x

MRU-M-SB6 x

MRU-M-SB7 x

MRU-M-SB9 x

MRU-M-SB10 x

MRU-M-SB11 x

MRU-M-SB12 x

MRU-M-SB14 x

MRU-M-EX1

Signals available from MRU 4th gen. 5th gen. Not changed

/both

Ethernet x

RS-232 x

RS-422 (only via JB1) x

MRC (WinMRC and DOSMRC), serial line x

MRC+, Ethernet x

PFreeHeave x

Analog channels x (only via JB3)

Internal time delays over MRU generations

Sensor interface delay (ta

) 5 ms 2.5 ms

Main processing time (tb

) 2.5 ms <1 ms

Digital line request response time (polled out) (tc

) 10 ms ± 10 ms 2.5 ms ± 2.5 ms

Output data preparation (td

) 0.8 + n • 0.2 ms 0 ms

Digital line request response time (polled output) (te

) 2.5 ms ± 2.5 ms 0 ms

Transmission delay on serial line (tf

) (n + l) •

40000/b ms

Polling message transmission delay (tg

) 50000/b ms

Time delay by cyclic digital output at MRU connector

(4 variables) (t = ta

+ tb

+ td

)

9.1 ms <3.5 ms

Group delay on angular rate (variable 1. 2 and 3) 25 ms 30 m