Mich. Admin. Code R. 408.11282 - Nonportable spot and seam welding machines
Rule 1282.
(1)
An external weld initiating control circuit for a nonportable spot or seam
welding machine shall operate at not more than 120 volts for stationary
equipment and not more than 36 volts for portable equipment.
(2) Stored energy or capacitor discharge type
of resistance welding equipment and control panels involving more than 500
volts (550 rms volts) shall be insulated and completely enclosed. Doors of this
equipment and control panels shall be interlocked in a manner to interrupt the
power and short circuit all capacitors when the door is opened. In addition to
the mechanical interlock, a manually operated switch or equivalent device shall
be installed to insure absolute discharge of the capacitors.
(3) The door and access panel of the
resistance welding machine and its control panel accessible at production floor
levels shall be kept locked or interlocked to prevent entry by unauthorized
employees to energized portions of the equipment. A door or access panel shall
be considered locked if a key or wrench is required to open it.
(4) Where an operator's fingers are inserted
between the electrodes during operation of a press welding machine, a device or
guard, such as but not limited to an electric eye, 2-hand control, barriers or
pull backs shall be provided and used.
(5) One or more safety emergency stop devices
shall be provided on all multispot welding machines with a minimum of 1 stop
device at each operator position.
(6) A large welding press shall be equipped
with one or more safety pins, latches, or blocks capable of sustaining the full
static load. The blocks, pins, and latches shall be electrically interlocked
with the power source so that when the blocks are removed from their storage
area on the machine and inserted under the ram or platen, the machine becomes
inoperative.
(7) The welding
transformer secondary shall be grounded by one of the following:
(a) Permanently grounding 1 side of the
welding secondary circuit.
(b)
Connecting a grounding reactor across the secondary winding with a reactor tap
to ground.
(c) As an alternate, on
nonportable machines, arranging for an isolation contactor to open 1 side of
the line, while the welding or electronic contactor shall open the other
side.
Notes
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