PVA PVA2000 - Page 49

Operation and Maintenance Manual Rev M(ii) 4/03
- 39 -
Operation Other Symptoms Possible Cause Corrective Action
Blown fuse.
• Check FU-1 which is
located inside the electrical
enclosure. Replace if
necessary.
Homing the axes.
The end effector
moves past the
home sensor and
hits the hard stop.
Home sensor is out of
position or too far away
from the homing tab.
• Depress the EMERGENCY
STOP push button. Move
the axis by hand until the
homing tab moves into the
home sensor. The sensor
should be on. Loosen the
lock nut on the sensor and
readjust to .020” gap.
Sensor cable is loose or not
connected.
• Check the cable
connections. Correct any
loose connections.
Homing the axes.
The Z axis does not
move.
End effector can be
moved freely when
the power is on.
The EMERGENCY STOP
push button is depressed.
• Release the EMERGENCY
STOP push button.
SSR-1 is not ON
when the Z axis
drive is enabled.
The Z axis brake is not
disengaging when the drive
is enabled.
• Check the SSR-1 wiring. It
should be on when the Z
axis drive is enabled.
SSR-1 is ON when
the Z axis drive is
enabled.
The fuse for SSR-1 is blown
or SSR-1 is damaged.
• Check the fuse using an
OHM meter. Replace
component if necessary.
Axis does not move. Encoder works
according to the
Encoder Feedback
Test on page 46.
The axis speed or
acceleration has been set to
zero.
• Set the speed and
acceleration to a positive,
non-zero value using the SP
and AC commands.
Axis drive light is
RED.
Axis drive is not enabled.
• Enable the drive using the
SH command.
The axis cables are loose or
not connected.
• Check the cable
connections. Correct any
loose connections.
The EMERGENCY STOP
push button is depressed.
• Release the EMERGENCY
STOP push button.
Hall effect sensors are not
correctly connected.
• Check the cable connections
for the axis. Correct any
loose connections.
• Check the hall effect sensor
phasing using the electrical
drawings.
The axis amplifier is bad.
• Replace the amplifier.