Connection Of Mains Supply; Potential Equalization Conductor; Selection Of Display Symbols For "Filter Ready - BRUEL & KJAER 4914 Instruction Manual

Rhino-larynx stroboscope

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3.1.3. Connection of Mains Supply

Before connecting a mains supply, the following mains voltage setting and fuse checks

should be carried out to ensure safe operation of the instrument.

Mains Voltage Setting

The Type 4914 may be powered from 100, 115, 127, 200, 220 or 240 V

10% (50 to

60 Hz) single phase AC mains lines. To select the correct mains voltage setting, use a

small coin or wide-blade screwdriver to turn the MAINS VOLTAGE Selector on the rear

panel until the appropriate voltage setting on the Selector lines up with the black arrow

printed on the panel.

Fuse Rating

The two mains fuses are contained in Fuse Holders immediately above the MAINS

VOLT AGE Selector on the rear panel and may be released using a screwdriver to turn

the centre of the Holder. For operation from 100 to 127 V supplies the two fuses should

be 2,5 A slow blow (B & K No. VF 0060), whilst for 200 to 240 V supplies they should be

two 1,25 A slow blow (B & K No. VF 0027). Make sure that only fuses of the required

rated current and of the specified type are used for replacement. The use of mended

fuses or the short circuiting of the fuse holder is prohibited.

Supply Connections

Once the mains voltage setting and fuses have been checked, the mains supply may be

connected to the mains input of the Type 4914 using the supplied Power Cable AN 0020.

3.1.4. Potential Equalization Conductor

The Equipotential Screw should be connected to a mains equipotential bonding conduc-

tor when this is required by hospital rules etc. The Connector is identified by a symbol

as shown in Fig. 3.2.

831950

Fig.

3.2.

The symbol for the Equi-

potential Screw on the

rear of the Type 4914

Any potential equalization conductor connected to the Equipotential Screw should be

identified throughout its length by green and yellow coloured insulation.

3.1.5. Selection of display symbols for "FILTER READY"

It is possible to choose different displays to indicate that the Filter is ready. When the

instrument is delivered it is set so that the display shown in Fig. 3.3. indicates that the

Filter is ready. The alternative displays are shown in Figs. 3.4. and 3.5., and instructions

for changing these displays can be found in the Service Manual.

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