SANDVIK Tunneling Miner
MT520 /
PLC
Page 25 of 31
Technical description-MT520-PLC specification .220.Rev 1
Electric supply for MT520 (information only):
The Sandvik Tunneling Roadheader MT520 needs to be electrically connected to a transformer via a
trailing cable. The maximum permissible length and the minimum cross section of the trailing cable
depend on the specific conditions on the jobsite.
In order to reduce the starting current of the hydraulic pump motor, an optional soft-start mechanism
(tyristor ) can be provided (see option “Soft-Start”).
Standard parameters for trailing cable in length and cross section refer to table below.
In case of les then 30°C ambient temperature a minimum cross section of 120 mm² of the trailing cable is
recommended.
In case of more than 30°C ambient temperature a trailing cable with a minimum cross section of 150 mm²
is recommended.
Installed power on the machine
Hydraulic motor
1x 150kW
Cutter motors
1x 315kW
with star delta start
Conveyor motors
2x 36 kW
Fan drive, water pump
3x 4kW
Option
Filling pump
1x 0,75kW
Average load
570 kVA
Frequent peak load
885 kVA
Sporadic peak load
~
1200 kVA
Recommended features for transformer & gate end box
Electrical features:
Nominal power:
1000kVA
Frequency:
50Hz
Nominal Input voltage:
11kV or 6.6kV depending on mine
Nominal output voltage:
1,0kV; ta/-5% & +/-10%
Impedance:
appr. 4%
Safety features:
Output circuit breaker
Overload and short circuit protection
Earth fault monitoring and earth fault lock out
Local on /off button
Emergency stop
Ground wire monitoring
2
nd
similar output (spare)
