What problems can insufficient coil voltage cause?
What will be an ideal response?
Insufficient coil voltage can produce as much if not more damage than excessive voltage. If the coil voltage is too low, the coil will have less current flow, causing the magnetic circuit to be weaker than normal. The armature may pick up, but not completely seal against the stationary pole pieces. This can cause an air gap between the pole pieces, preventing the coil current from dropping to its sealed value. This causes excessive coil current, overheating, and coil burnout. A weak magnetic circuit can cause the movable contacts to touch the stationary contacts and provide a connection, but not have the necessary force to permit the contact springs to provide proper contact pressure. This can cause arcing and possible welding of the contacts. Without proper contact pressure, high currents will produce excessive heat and greatly shorten the life of the contacts.
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