Bosch L 309 Series, Technical Information

Safety instructions

Type L 309

Power Supply Module

I−7

1070 078 131-104 (00.05) GB

Operation of the power supply modules

CAUTION!

- Danger of injury and of damage to property when operating the units outside a

switch cabinet!
The units are designed to be installed in housings or switch cabinets and may
only be operated in such housings or cabinets with the door closed!

- Danger of injury and of damage to property through missing or false interpreta-

tion of fault messages!
Therefore, closing of the temperature contact connected to X1 (thermostatic
switch) of the modules must inhibit the connected timer! For interpreting the
fault messages also note the information contained in the ”Fault messages”
Section.

- Danger of bruises through electrode movement!

All users, line designers, welding machine manufacturers and welding gun pro-
ducers are obliged to connect the output signal of the Bosch weld timer which
initiates the electrode movement so that the applicable safety regulations are
complied with.
The risk of bruises can be considerably reduced by means of, 
e.g.,

‘

two-handed start

‘

guard rails

‘

light barriers etc.

NOTE

- Damage to property through insufficient cooling of the modules!

The power supply modules must not be operated unless the cooling water cir-
cuit is active!

- Damage to property through excessive welding current!

The maximum admissible welding current depends on the thyristors of the
power supply modules and must not be exceeded.
Therefore, the thyristor load must be verified in each individual case by the user.
For more information, please refer to the ”Dimensioning instructions” Section.
No liability is accepted in the event of non-compliance.

Retrofits and modifications by the user

The power supply units have been designed and manufactured by us as safe units.

WARNING!

Modifications may have negative effects on the safety of the unit! 
The possible consequences include death, severe or light injury (personal injury),
damage to property and environmental hazards. 
Therefore, please contact us prior to modifications. This is the only way to deter-
mine whether modified parts are suitable for use with our product.

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