Fault-Finding; What Is To Be Done If - Stahl SH 3 Operating And Maintenance Instructions Manual

7 Fault-finding

7.1 What is to be done if?

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7.1.1 Wire rope hoist does not start, motor hums
• Not all power phases are present.
1. Check fuses,
2. Check supply cable,
3. Check control pendant and switchgear.
7.1.2 Wire rope hoist does not start after a long stoppage, or starts with difficulty,
motor hums
• Hoist brake is stuck.
1. Remove fan cover
2. Dismantle brake
7.1.3 Loud clicking when switching on
• Measure air gap, see page 34.
• Replace brake disc if necessary, see page 34.
7.1.4 Braking path too long
• Brake displacement too long.
• Brake lining worn.
• Replace brake disc, see page 34, "Hoist motor brake",
7.1.5 Bottom hook block and rope rotate
• Rope is twisted.
• Untwist rope, see page 50, "Replacing rope".
7.1.6 Cross travel not possible
• Hoist is in highest hook position, cross travel is disconnected.
• Lower bottom hook block until up motion is possible again
7.1.7 Lowering not possible
• Hoist is in bottom hook position
• Operational or emergency hoist limit switch is faulty
• Check hoist limit switch
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