Description
52 Product Specification IRB 6600 M2000
1.9.3 Power Unit
The standard Power unit for SpotPack contains the electric components and circuits
needed for spot welding. The power unit cabinet is designed to be placed on top of the
robot control cabinet, see picture below, and secured with four attachment plates. The
power unit should be seen as a main part of the complete SpotPack (type S and HS) and
normally not handled as a separate unit.
The electrical circuits of the power unit consist of weld power circuit and control
circuits to control the welding.
Weld power circuit
The welding power for the welding gun is fed through a circuit breaker and welding
thyristor (for AC welding) or inverter (for MFDC welding) and further out to the weld-
ing power cable. The welding power cable is connected directly to the thyristor/
inverter.
Control Circuits
Power 240 V AC and 24 V DC for the control circuits is fed from the robot cabinet.
Also the safety circuits in the robot cabinet is used to interlock the welding timer.
A welding timer (Bosch), integrated with the air cooled thyristor or inverter, controls
the welding current. The welding timer includes control program which gives
possibility to program different weld sequence. The programming is normally done on
a PC that is connected directly to the welding timer. The interface between the robot
system and the welding timer is handled via a digital signal interface. Example of
signals are weld start, weld ready, weld program choice and error.
Also cross connections, of interface signals and interlocking between the robot system
(I/O-boards), the water and air unit, signals to DressPack and pedestal / stationary gun
(type HS), are done within the power unit.
For further information see Installation and Maintenance manual and separate manuals
for the Bosch equipment.
Programming device for the welding timer is not included.
Option 2087 Power unit, AC welding type S
The basic power unit for type S is equipped for a robot handled AC Spotwelding gun
and with the following components:
- Cable gland for incoming power (X100)
- Circuit Breaker type ABB SACE, T1 160 A
- Welding Timer and Thyristor type Bosch PST 6100.100L 76kVA
- Fuse terminal for 24 V distribution
- Connector to Water and air unit, Modular Harting. (XS103)
- Cable gland for outgoing power (X101). (For power cable see option 2095/
2096)
For further information see Installation and Maintenance manual, circuit diagrams and
separate manuals for the Bosch equipment.
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