3.4.2.2 Connecting the Main Power Cable
Connect the main power supply cable to the AC1, AC2 and AC3 terminals of the main power
connector. Connect the Protective Earth wire to the nearest PE terminal on the terminal block.
Notes for connecting the AC power cable:
For best noise immunity, a shielded (not twisted) cable is recommended (not
mandatory) for the AC power supply cable. A 4-wire shielded cable should be used.
The gauge is determined by the actual current consumption of the motor.
Connect the four wires to the AC power leads of the source.
For safety requirements, the fourth wire must be used for the protective earth
connection (connected to the PE terminal).
AC3
AC1
TUB00020B
Tuba
Figure 3-9: Main Power Supply Connection Diagram
3.4.2.3 Connecting the DC Link Cable
Each Tuba contains a shunt. Its purpose is to "absorb" regenerated energy created by the
motor during braking and convert that energy into heat. If the energy regenerated by the
motor exceeds the capacity of the shunt, the drive is switched off and an over-voltage error
message is sent.
To prevent this from happening, the capacity of the shunt system can be extended by
connecting the shunts of several Tubas in parallel. When two or more Tubas are connected, by
DC Link cables, the regenerated energy is distributed equally among the drives. This spreads
the energy spikes over several shunts and enables the specific Tuba to continue normal
operation.
Figure 3-10: The Tuba's External DC Link Option
(Note: Tuba 1 and 2 must have an identical voltage rating.)
Tuba Installation Guide Installation
MAN-TUBIG (Ver. 1.3)
3-12