Operation Of The Thyristor Power Units - Bosch PST 6000 Series Technical Information

Safety instructions
1-13
1.9

Operation of the thyristor power units

DANGER
Danger of personal injury and damage to property if devices are op-
erated before they have been properly installed!
The devices are designed to be installed in housings or switchgear
cabinets and must not be operated unless properly installed and
switchgear cabinet doors are closed!
DANGER
Danger of personal injury and damage to property through missing
or false interpretation of fault messages!
Therefore, closing of the temperature contact (thermostatic switch,
break contact) must inhibit the connected timer!
As regards fault analysis, see also the section on "Malfunction".
DANGER
Danger of bruises through electrode movement!
All users, line designers, welding machine manufacturers and weld-
ing gun producers 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.
CAUTION
Damage to property through insufficient cooling of the modules!
Ensure that the modules are properly cooled during operation. Con-
densation on water-carrying components must be prevented. In the
case of air-cooled thyristor power units, the temperature inside the
mounting station must remain in the specified range. In the case of
water-cooled thyristor power units, the maximum permitted cooling-
water temperature must not be exceeded.
CAUTION
Damage to property through excessive welding current!
The maximum welding current depends on the thyristor unit and the
welding transformer in use. It must not be exceeded.
Therefore, the user must check the load in each case. See also the
section on "Load diagrams".
Any and all warranty excluded in case of non-compliance.
1070 080 058-101 (2001.04) GB