AMPLIFIER
The amplifier, viewed through the starter
enclosure window, is an electronic device
that processes the sensor signal (Figure
10). Based on the sensor signal, the
amplifier will either allow or not allow the
machine to start. The amplifier’s LEDs
help identify possible problems with the
safety switches.
Function of the amplifier’s LEDs is as
follows: when the green “relay condition”
LEDs are illuminated, the guards and
covers equipped with switches are in
place and properly aligned. When one or
both of the red “relay condition” LEDs are
illuminated, a safety switch circuit is open.
When the red “switch output” LEDs are
illuminated, they indicate which correspon-
ding safety switch is open.
When the red “attention” LED is flash-
ing, the amplifier has gone into a reset
condition. With all sensors and actuators
properly aligned, 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 42).
13
SAFETY
Safety Switch System
3
1
2
4
Figure 10 — Amplifier. (1) Green “Relay Condition”
LEDs, (2) Red “Relay Condition” LEDs, (3) Red
“Attention” LED, (4) Red “Switch Output” LEDs
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