Troubleshooting
7-5
Maintenance and
Troubleshooting
Troubleshooting
Many problems can be easily determined and solved. Before attempting any service
inside the motor enclosure of the machine, check the other possible solutions.
Hoist Motor
Refer to Figure 7-2 for an illustration of the Hoist Hub and Pinch Roller Assembly.
Problem:
Hoist motor will not go up or down:
Possible Solutions:
• Check motor fuse on motor control console. Replace with 6 1/4 AMP slo-blow, if
necessary.
• Check that the pendent AUTO/MAN switch setting is set to manual (MAN). If the
system is in the automatic (AUTO) mode, the hoist will not operate. To move the
crosshead up or down, the switch must be set to manual (MAN).
• Check that the pendent PNEU/GRAV switch setting is set to gravity mode (GRAV).
If the crosshead is in the top position and the pendent is set to the pneumatic mode,
the crosshead cannot be lowered. To lower the crosshead, the switch must be set to
the gravity mode.
• Check door interlock switches, pendent cable, air connections and air supply. The
hoist motor will only run if the yellow pendent light is on and pressurized air is
connected to the system.
• If motor clicks but will not run, disconnect the power and remove the back panel of
motor enclosure. Check the mechanical relay mounted in the socket to the left of the
hoist motor. This should be tightly secured and not burned.
Problem:
Latch stops part way to the top, or will not travel smoothly:
Possible Solutions:
• Check the height scale switch. Remove switch or run in manual mode.
• Check the crosshead and latch assemblies for binding. Perform a velocity check as
described in the section called Installing the Crosshead Weights in Chapter 3 under
the heading, "Assembly Check-out." Check the latch assembly binding by pulling
the hoist cable at the rear of the machine and raising the latch. The latch should
move freely. If latch or crosshead are binding, contact Instron Dynatup.
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