Motor drive apparatus having function for determining abnormality of main power supply voltage
First Claim
1. A motor drive apparatus in which a main power supply used for motor drive is supplied via a magnetic contactor, the motor drive apparatus comprising:
- a monitoring unit electrically connected to no more than a single power supply,the single power supply consisting of a single three-phase AC power supply,the monitoring unit comprising three leads, each lead being coupled to a corresponding phase of the three-phase AC power supply on the AC power supply input side, each of the three leads being configured to measure the phase voltage of a corresponding phase of the three-phase AC power supply such that every phase of the three-phase AC power supply is monitored by the monitoring unit at the three-phase AC power supply of the magnetic contactor in a state in which contacts of the magnetic contactor are opened;
a determination unit in electrical communication with the monitoring unit, the determination unit determining whether the main power supply voltage monitored by the monitoring unit is normal; and
a magnetic contactor control unit in electrical communication with the determination unit and the contacts of the magnetic contactor, the magnetic contactor control unit outputting a command that controls opening and closing of the contacts of the magnetic contactor based on whether the main power supply voltage is abnormal as determined by the determination unit, wherein when it is determined by the determination unit that the main power supply voltage is abnormal, the magnetic contactor control unit maintains an output of an open command that controls such that the contacts of the magnetic contactor are opened.
1 Assignment
0 Petitions
Accused Products
Abstract
A motor drive apparatus in which a main power supply used for motor drive is supplied via a magnetic contactor includes: a monitoring unit that monitors a main power supply voltage at an AC power supply input side of the magnetic contactor in a state in which contacts of the magnetic contactor are opened; a determination unit that determines whether the main power supply voltage monitored by the monitoring unit is normal; and a magnetic contactor control unit that outputs a command that controls opening and closing of contacts of the magnetic contactor, wherein when it is determined by the determination unit that the main power supply voltage is abnormal, the magnetic contactor control unit maintains an output of an open command such that the contacts of the magnetic contactor are opened.
36 Citations
5 Claims
-
1. A motor drive apparatus in which a main power supply used for motor drive is supplied via a magnetic contactor, the motor drive apparatus comprising:
-
a monitoring unit electrically connected to no more than a single power supply, the single power supply consisting of a single three-phase AC power supply, the monitoring unit comprising three leads, each lead being coupled to a corresponding phase of the three-phase AC power supply on the AC power supply input side, each of the three leads being configured to measure the phase voltage of a corresponding phase of the three-phase AC power supply such that every phase of the three-phase AC power supply is monitored by the monitoring unit at the three-phase AC power supply of the magnetic contactor in a state in which contacts of the magnetic contactor are opened; a determination unit in electrical communication with the monitoring unit, the determination unit determining whether the main power supply voltage monitored by the monitoring unit is normal; and a magnetic contactor control unit in electrical communication with the determination unit and the contacts of the magnetic contactor, the magnetic contactor control unit outputting a command that controls opening and closing of the contacts of the magnetic contactor based on whether the main power supply voltage is abnormal as determined by the determination unit, wherein when it is determined by the determination unit that the main power supply voltage is abnormal, the magnetic contactor control unit maintains an output of an open command that controls such that the contacts of the magnetic contactor are opened. - View Dependent Claims (2, 3, 4, 5)
-
Specification