INSPECTION
w
WARNING:
In the event of an electri-
cal problem, only a qualified electrician
should inspect or repair the fault. Always
disconnect and lock out power source be-
fore beginning electrical inspection or re-
pair.
Amplifier: the amplifier and the switches
incorporate self-diagnostic features to help
identify the source of problems. The LEDs on
the amplifier (Figure 5) will indicate the status
of the system:
w
WARNING:
The amplifier must be
properly wired to function correctly. Con-
sult the manufacturer’s literature for com-
plete wiring instructions.
Both green “relay condition” LEDs are
illuminated: all circuits are closed and
machine is ready for operation.
Red “relay condition” LEDs and any of
the red “switch output” LEDs are illuminat-
ed: the circuit for the sensor assigned to that
location is open. If the sensor and actuator are
aligned and within specified sensing distance,
the sensor or resistor has failed and must be
replaced.
Both red “relay condition” LEDs are illu-
minated and the red “attention” LED is
flashing: the amplifier has detected a fault.
Inspect the condition and placement of sensor
leads and resistors. Terminals should be tight
and free from corrosion. With sensors and
actuators aligned and within specified sensing
distance, reset the system by turning the
power disconnect switch to “O”(OFF) and then
turning the power disconnect back to “I” (ON).
If all items are in good condition and red
“attention” LED is still flashing, the amplifier
has failed and must be replaced.
w
WARNING:
Always perform the pre-
start safety switch test before operating the
machine. See “Safety Switches”, page A2.
NOTE:
An exchange program is available
should the amplifier need replacement; con-
tact Urschel Laboratories for complete infor-
mation.
MAINTENANCE
Electrical Assembly
A4
1
7
2
3
5
6
8
4
Figure 5 — Amplifier. (1) Fuses, (2) Relays, (3) Sensor
Leads, (4) Resistors, (5) Green “Relay Condition” LEDs,
(6) Red “Relay Condition” LEDs, (7) Red “Attention”
LED, (8) Red “Switch Output” LEDs.
To Next Page
Loading...
