YRC ser
ies
2-20
2
3.2.4 Overview of circuit operation
This section describes an overview of the circuit operation for each safety circuit configuration example shown in the
previous sections.
1.
During AUTO mode
The main power is supplied only when the enable switch is disabled, the controller is in a normal state (MPRDY is ON) with no
internal alarms occurring, and also all the following conditions are met:
Conditions
• Maintenance mode switch is in AUTO (M1: open, M2: closed)
• Door switch's NC contact is closed.
• External emergency stop button's NC contact is closed.
• PB emergency stop button's NC contact is closed.
CAUTION
Connect the PB terminator or PB to the PB connector on the controller front panel. If the PB connector on the controller front panel is
open, an emergency stop occurs.
2.
During maintenance
The main power is supplied only when the door switch is disabled, the controller is in a normal state (MPRDY is ON) with no
internal alarms occurring, and also all the following conditions are met:
Conditions
• Maintenance mode switch is in SERVICE (M1: closed, M2: open)
• External emergency stop button's NC contact is closed.
• PB emergency stop button's NC contact is closed.
• PB enable switch's NO contact is closed.
CAUTION
Always disconnect the PB terminator from the PB connector on the controller front panel and connect the PB to the PB connector.
