The electrical system has prewired safety
switches on certain covers and guards to pre-
vent the machine from operating when these
covers or guards are removed.
WARNING: Before operating the ma-
chine, a qualified trained person should
check the safety switches by the following
procedure. Be careful to avoid contact with
cutting parts and sharp edges exposed
during these tests!
AMPLIFIER
The amplifier, viewed through the starter en-
closure window, indicates the condition of the
safety switch circuits (see Figure 18, page 23).
When the green “relay condition” LEDs are il-
luminated, all circuits are closed and machine
is ready for operation.
When one or both of the red “relay condition”
LEDs are illuminated, one of the safety switch-
es is creating an open circuit. The illuminated
red “switch output” LEDs will indicate the prob-
lem source.
When the red “attention” LED is flashing and
all sensors and actuators are within specified
sensing distance, the power to the machine
must be turned off and then on again to reset
the amplifier. If the amplifier will not reset, call a
qualified electrician to locate and repair the
fault (see “Amplifier”, page 59).
SAFETY SWITCH TEST
WARNING: There is a problem in the
safety switch circuit if the LEDs are not lit
as indicated or if, having removed a cover
or guard equipped with switch, the ma-
chine can be started. DO NOT operate the
machine in this condition! Call a qualified
electrician to locate and repair the fault im-
mediately. See “Inspection”, page 58.
1. With all covers and guards in place, turn
the power disconnect switch to “I” (ON).
Only the green “relay condition” LEDs on
the amplifier should be lit. Turn power dis-
connect switch to “O” (OFF).
2. Remove or open one cover or guard
equipped with switch. Turn power discon-
nect switch to “I” (ON). Only the red “relay
condition” LEDs and the red “switch output”
LEDs corresponding to the switch on the
removed or open cover should be lit on the
amplifier. If LEDs are lit correctly, push the
“I” (START) button. The safety switch circuit
has been interrupted and machine should
NOT start. If the machine does start, that
safety circuit has failed. Push the “O”
(STOP) button, then disconnect and lock
out power source. Call a qualified electri-
cian to locate and repair the fault immedi-
ately.
3. Turn the power disconnect switch to
“O” (OFF) and replace or close the cover
or guard.
4. Individually remove or open each addi-
tional cover or guard equipped with
switch and repeat steps 2 and 3. Make
sure all covers and guards are securely in
place after all switches have been tested.
OPERATION
Safety Switches
22
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