Page 9
Electrical
Check insulation resistance and if less than 1 megohm DO NOT USE, consult a qualified electrician. Perform
a continuity resistance check between the external earth point and end covers, terminal box lid and nameplate,
if the resistance is more than 1.0 ohms between the earth point and any of the aforementioned items, DO NOT
USE, consult a qualified electrician. Note: this continuity check should be performed after each removal and
re-fitting of the end cover and terminal box lid.
A flexible cable and suitable cable gland must be used to connect between the vibrator and supply junction
box.
The cable gland shall comply with EN60079-0 and have an IP rating equal to or better than IP66 (see table on
pages 4 & 5 for cable entry thread sizes). The supply must be suitably fuse protected. 4 core cable to be
used with flexible conductors type; 24/0.20 (BLz 03); 50/0.25 (BLz 05 – BLz 40); 56/0.30 (BLz 45 – BLz 50);
80/0.40 (BLz 60/61 – BLz 75-80): BLz 24 to BLz 80 are fitted with thermistors as standard and require a 2
core cable with flexible conductors type 30/0.25. The external earth cable must have a cross sectional area of
at least 4mm²
Flexible conductors must be terminated with insulated crimp on ring terminals, or ring terminals fitted with
insulating sleeves for L1, L2, L3 and earth. Plain soldered ends for thermistor connections T1 and T2.
If thermistors are not required leave the blanking plug in the cable entry hole.
BLz Vibrators are suitable for a 3 phase 50Hz or 3 phase 60Hz electrical supply. BLz vibrators are
rated for continuous duty. The insulation class of the winding will be either ‘F’ or ‘H’ as indicated on
the nameplate. Starting can be direct on line via inverter or soft start. Each vibrator MUST BE
INDIVIDUALLY PROTECTED against overload. Each overload should be of the delayed magnetic-circuit
breaker type to prevent tripping during the high starting current requirement of vibrator starting. The overload
size should be selected based on the full load current and starting current values listed on pages 11 & 12.
NOTE When operating vibrators at speeds above pole speed the out of balance force MUST be reduced or
DAMAGE WILL OCCUR; see Page 30 for correct percentage reduction.
VOLTAGE RANGE
The voltage range data on pages 11 & 12 (230-690v 50Hz and 230-575v 60Hz) is served by four distinct
windings* thus:
380 - 415v 50 Hz, 460 - 480v 60Hz
* Except BLz40 8 Pole which uses group 43 windings for 460-480v 60Hz.
The winding group number and Hertz appears in the vibrator designation and on the nameplate Thus a BL25-
14/4 400v 50Hz machine will be designated BL25-14/4/01/50.
It is essential that the correct Winding (group) is used with the specified electrical supply. Non-
compliance with the above instructions will result in electrical failure.
Terminal post nuts should be tightened to the values given in the table below.
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