System Interconnection; Fan Motor Fuses - BRUEL & KJAER System V Instruction Manual

381 mm (15 ini
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15 mm (0.59 ini
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Fig . 2 . 4 . Base p/ate dim ensions for 4801 T
2.2.1. System Interconnection
The Type 4801 Exciter Body is supplied with two captive cables . One of these is a five ­
core cable , which carries three-phase mains power to the Exciter Body . It includes a neu ­
tral and an earth . The other is the safety trigger cable . When the 4801 is used with a
suitable B & K amplifier such as Types 2707 or 2708, this cable is used to initiate shut­
down in the event of overheating of the field coil , loss of a supply phase or blowing of
one of the fuses on the safety circuit board . Shutdown includes removal of both the exci ­
tation and the three-phase supply from the Exciter .
For connection of these cables to a B & K Amplifier Type 2707 or 2708 , refer to the in­
struction manuals for these instruments .
If the 4801 is to be connected to an older am­
plifier Type 2707 , having si ngle-phase power requirements, consult your B & K represen ­
tative . Remember to reduce CURRENT LIMIT to alevei appropriate to the head in use,
especially with the more powerfu l Amplifier Type 2708 .
For maximum operating safety the green / yellow conductor in the power cable must be
connected to a suitable earth, such as the protective earth contact of a ma ins socket out­
let . The use of extension cables without protective conductor sha.1I be avoided.
Connection of th e Exciter Head to the power amplifier is made via drive cable AQ 0026 ,
which has a 3-pin connector at each end . Either end may be connected to the Exciter
Head .
2.2.2 . Fan Motor Fuses
The three fan -motor fuses are situated on the safety circuit board. To gain access to
them remove th e base cover of the Exciter , which is held in place by four screws. See
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