Patent ID: 7123018
Filing Date: 2006-10-17
Classification: G05B,H01H

Abstract:
1. A switch status determination device comprising: a voltage application means that periodically applies a direct current voltage between contacts contacts of a manual switch of a device; a determination means that determines a status of the manual switch; and a voltage adjusting means for adjusting the levels of the direct current voltage applied between the contacts, wherein the voltage application means produces at least high and low levels of the direct current voltage for applying between the contacts, the determination means determines the status of the manual switch by detecting whether a current flows between the contacts when the direct current voltage is applied and the determined status is used for control of the device having the manual switch, the control is performed by a control device, wherein; the voltage adjusting means adjusts the direct current voltage between a low non-zero level and a high non-zero level when the control device is in a non-operational state, and the voltage adjusting means controls the direct current voltage at the high non-zero level when the control device is in an operational state.