(“Electrical Assembly”, con’t. from page 41)
Amplifier: The amplifier and safety
switches incorporate self-diagnostic features
to help identify the source of problems. The
LEDs on the amplifier (Figure 25) will indi-
cate the status of the system:
WARNING: The amplifier must be
properly wired to function correctly. If
an amplifier or sensor is replaced,
consult the manufacturer’s literature
for complete wiring instructions.
Both green “relay condition” LEDs
are illuminated: all circuits are closed
and machine is ready for operation.
No LEDs are illuminated: verify power
to terminals L1 and L2. If there is power
and the LEDs are not illuminated, turn the
power disconnect/lockout switch to “O”
(OFF) and lock out power source.
Remove fuses (see Figure 25) and check
with ohmmeter. Replace faulty fuse. If
problem persists, contact Urschel
Laboratories.
Red “relay condition” LEDs and any of
the red “switch output” LEDs are illu-
minated: the circuit for the sensor or
resistor assigned to that location is open.
If red “switch output” LEDs which corre-
spond to a sensor are illuminated, discon-
nect and lock out the power source, and
perform the safety switch inspection.
(See “Safety switches”, page 41). If red
“switch output” LEDs which correspond to
a resistor are illuminated, disconnect and
lock out the power source, verify the
resistance value of the resistor and check
the connection for tightness (5 inch pounds
or 0.56 newton-meters). Turn power dis-
connect/lockout switch to “I” (ON). If LEDs
remain lit, contact Urschel Laboratories.
MAINTENANCE
Electrical Assembly
42
2
7
5
6
1
3
8
Figure 25 — 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
4
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