Kiwicrane Electric hoist contactor daily check points
January 11, 2018
1 electric hoist contactor magnet contact area should be greater than 75%, the contactor can not skew the magnet can not be blocked, and the magnet surface to be kept clean. At the same time to ensure short-circuit ring intact, no fierce noise.
2. No leakage coil, fixed firmly, the heating temperature should be below 75 ℃.
3. Arc shield intact, not card contacts, arc suppression coil is not short-circuit.
4 contacts on the drip hole copper hole flat, contact polished, mechanical strength is not enough or super-stroke reaches the required value, the replacement of new contacts.
Contact contactor contact width should be greater than 3/4.
6. lifting electric hoist contactor contact pressure calculation method:
Contact final pressure Fz = 22.0.5 · LE / 100 (Le: rated current)
Contact initial pressure of Fe = 0.5Fz
7. The contact should be sufficient open distance and overtravel.
8. A contact at the same time contact that is not more than about 0.5mm deviation.
9. Interlocking contact over travel is 2-4mm, the pressure is 1.3-2.5N.
10. Requirements lifting hoist contactor light and flexible movement, bearing lubrication often need to be lubricated.
11. Positive and negative contactor mechanical interlock should be adjusted properly, when a contactor contact will contact, the contact of the other contactor is not closed, the gap of not less than 3 mm.
12. Keep each thread is not loose, tight screws, the insulation to keep clean.
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