Rc420 Rev - Epson RC420 Manual

CPU Irregularity Detection
Irregularity in the motor controlling CPU is monitored by a watch-dog timer. Also, the
system CPU and the motor controlling CPU inside the Controller are designed to
constantly check each other for any discrepancies. If a discrepancy is detected, the
dynamic brake circuit is activated.
Memory Check-sum Error Detection
The dynamic brake circuit is activated when a memory check-sum error is detected.
Overheat Detection at the Motor Driver Module
The dynamic brake circuit is activated when the temperature of the power device inside
the Motor Driver module is above the nominal limit.
Over-Voltage Detection
The dynamic brake circuit is activated when the voltage of the Controller is above the
normal limit. (When a regeneration module is mounted.)

RC420 Rev.9

Setup & Operation 1. Safety
9