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Hi,I have a 4 wire AC powered treadmill motor and when i press start, the motor runs for 1-2seconds and then stop, after fully stoped in static position it can run again for 1-2sec... where can be the problem? In the motor? 4wire - 2blue , 1black and 1red. 2 blue wire are for AC power supply 220V . For what are black and red? Is PWM wait information from them?Please help me!Thank you?