Both red “relay condition” LEDs are
illuminated and the red “attention”
LED is flashing: the amplifier has
detected a fault. To reset the system,
turn the power disconnect/lockout switch
to “O” (OFF) and lock out power source.
Perform safety switch inspection (see
“Safety switches”, page 41). Turn power
disconnect/lockout switch to “I” (ON). If
problem persists, contact Urschel
Laboratories.
WARNING: A qualified trained
person must always perform the safety
switch system test before operating the
machine. See “Safety Switch System
Test”, page 14.
NOTE: An exchange program is avail-
able should the amplifier need replacement;
contact Urschel Laboratories for complete
information.
Resistors and sensor leads: Check
dielectric grease coating on resistors, sensor
leads and terminal strip. Dielectric grease
provides a moisture barrier to reduce the
potential for premature amplifier failure. If
resistors, sensor leads and terminal strip
need to be greased, use only dielectric tune-
up grease. Generously fill each hole on
bottom of lower terminal strip and each screw
terminal hole for the sensor leads, and coat
each resistor with the grease. Use a small
brush to smooth out grease and ensure
grease completely covers terminal strip area
(Figure 26).
MAINTENANCE
Electrical Assembly
43
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