BRUEL & KJAER 2976 Instruction Manual Download Page 25 | Manualshive

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Summary of Contents for 2976

Page 1: ...struction Manual 033 0654 to comply with existing equipment There are no changes which affect the use of the instrument Dept 3 October 1984 n s Q 1 11n Q 1p Q r a u11 9 n Ch 1 Input Q Measure Ch 2 Inp...

Page 2: ......

Page 3: ...photoelectric probe supplied provides a phase angle reference A liquid crystal display reads out the mea sured phase with a resolution of 1 Change over switches are provided for se lection of each of...

Page 4: ......

Page 5: ...PHASE INDICATOR TYPE 2976 October 1984...

Page 6: ...ENTS 7 7 7 8 9 Vibration Meter 9 Tunable Filter 10 Accelerometers PREPARATION FOR BALANCING Connection of Instruments Vibration Analyzer Tachometer Probe 10 10 10 11 12 Use of the Set Filter Facility...

Page 7: ...trast mark on the rotor It is pow ered from the 2976 through its con necting cable If a magnetic probe is required this can be obtained separ ately Full details of both the MM 0012 and the MM 0002 Mag...

Page 8: ...socket accept ing plug JP 0035 Specifications 2976 Set Filter signal 0 222 V Pk Pk square w13ve at rotation frequency fundamental component 0 1 V RMS approx output impedance 1 kO Measure signal Same a...

Page 9: ...nd accelerometer cables such as AO 0038 and AO 0122 for connection of two vibration transducers Connects to the change ov er contacts of the CHANNEL SELECTOR Two way paddle switch for selecting CH 1 I...

Page 10: ...R INPUT When the filter centre frequency is equal to the frequency of the TA CHO INPUT signal this will result in a PHASE indication of 180 and the indication on the vibration meter will be maximum Me...

Page 11: ...current 36 mA at be tween 7 and 20 V DC Standard BNC socket accepting plug JP 0035 for feeding in the signal whose phase angle is to be indicated on the PHASE display Is nor mally connected to the AC...

Page 12: ...nel about half a turn anticlockwise and sliding the bottom panel off towards the rear When replacing the bottom panel turn the thumbscrew fully anticlockwise and check that the panel is locked in posi...

Page 13: ...ith the battery in place tighten the screw and connect the two battery leads to their respective battery terminals 5 Secure the printed circuit panel back in place with its two screws replace the side...

Page 14: ...batteries very slightly but not by more than 10 To gain access to the fuse installed in the Phase Indicator section take off either side panel as for installing a battery step 1 above The fuse is a s...

Page 15: ...ining EXTERNAL POWER SUPPLY socket to EXT POWER on the 1621 using the short 7 pin DIN cable AQ 0042 supplied 10 Connect TO PREAMPLIFIER INPUT on the 2976 to INPUT on the rear panel of the 2511 using a...

Page 16: ...ing the choice of Accelerometer is not critical since the rotor can be bal anced with uncalibrated transducers of different sensitivities This may be acceptable in cases where the only requirement is...

Page 17: ...0133 TO EXT Fl LTER FILTER INPUT INPUT AO 0133 FROM AC OUTPUT RECORDER OUTPUT FILTERED set to AC AO 0133 TO EXT Fl LTER FILTER OUTPUT OUTPUT 810005 1 Table 3 1 Interconnection details for setting up a...

Page 18: ...a band right round the rotor circumference in the plane where the mark is to be using matt black paint Place a 10 mm 0 4 in square piece of clean reflective adhesive tape with sharp clean cut edges ac...

Page 19: ...of Photoelectric Tachometer Probe MM0012 Fig 3 7 Example of a typical mounting arrangement for Photoelec tric Tachometer Probe MM 0012 Fig 3 8 Use of a magnetic dial gauge stand for mounting Photoelec...

Page 20: ...il it does light and try to set the knob approximately in the centre of the range where correct triggering is obtained Set SET FILTEA MEASURE on the 2976 to Set Filter On the 1621 set the controls as...

Page 21: ...speeds between 120 and 180 r min On the 1621 the rotation frequency in r min can be read off the inner scale of the FRE QUENCY TUNING knob which must be multiplied by the range multiplier shown under...

Page 22: ...Mass M MR in g which is given by the following expression M MR Specific Unbalance required in g mm kg x Rotor mass in kg Correction radius in mm 5 A suitable mass for making trial corrections is five...

Page 23: ...ct up the instruments section 3 3 1 2 Mount the Accelerometers and set up the Vibration Analyzer section 3 3 2 3 Set up the Tachometer Probe section 3 3 3 4 Select suitable values of mass for making t...

Page 24: ...edure using the same trial corrections Section 3 6 discusses difficulties which may prevent satisfactory balance from being achieved I 60 C I 40 Posit ive Direction I angles of I I 200 rotation I 0 tr...

Page 25: ...uction ratio achieved is poor and the speed has drifted in the course of the measurements the measurements should be repeated with the machine run long enough beforehand for its speed to stabilize Alt...

Page 26: ...nearity may result in influence coefficients which change with the amount of correction made This manifests itself as an unacceptable unbalance reduction ratio Correction dependent influence coefficie...

Page 27: ...ich impairs its correct function all power should be disconnected to prevent the risk of further damage For repair consult the se parate Service Instruction Manuals provided or contact your local B K...

Page 28: ...9 A211 10 L21 in correction I I plane 1 I I Trial mass 2 5 A121 6 L12 11 A 22 I 12 L22 in correction I plane 2 I I I I Trial mass 1 Trial mass 2 113 I I 14 I Correction plane 1 Correction plane 2 I I...

Page 29: ......

Page 30: ...2976 Bri iel Kjmr DK 2850 NJERUM DENMARK Telephone 45 2 800500 Telex 37316 bruka dk Printed in Denmark by Nrerum Offset English DK BE 0654 12...

Page 31: ......

Page 32: ...2976 Briiel Kjcer DK 2850 N tERUM DENMARK Telephone 45 2 800500 Telex 37316 bruka dk Printed in Denmark by Nrerum Offset English DK BE 0654 12...

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