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1.Introduction
This is the supplementary of the instruction manual “EDC Driver Unit System (Document
Number: C20158).” This supplement describes the Megatorque Motor System composed of the
EDC Driver Unit and the PN series Megatorque Motor. Please refer to the above mentioned
instruction manual (Document No.C20158) for items not described in this document.
1.1. Precautions for Use
！Warning
：
Be sure not to activate the dynamic brake in the following conditions.
Otherwise the dynamic brake circuit may break and the Motor will
enter in a “free run” state, leading to possible injuries.
◊ Do not activate the dynamic brake in normal operations. Stop the Motor by a control
command, not by the dynamic brake. The dynamic brake is an auxiliary function to
stop the Motor immediately in an emergency. In the middle of operation, an alarm, a
warning or the “Emergency stop” input activates the dynamic brake.
• Warnings that initiate “Servo-off” state are “A3” (Software thermal), “C0”
(Position command/Feedback error), “C5” (Field bass error), “F5” (Program
error), and “F8” (Automatic tuning error).
◊ The load inertia to a Motor must be 70 times or less than the Motor inertia (100 times
for the PS1, PS3 and PN2 type Motors). In case of an indexing operation, a position
command shall be 360 degrees or less, while the maximum speed for continual rotation
must be 0.5 sec-1 or less.
(However, there may be a possibility to exceed the above limits in some cases. Please
consult NSK when you require a close investigation on the limits.)
◊ For the PN4180 Motor, be sure to stop the Motor for 20 minutes or longer when you
stop it by the dynamic brake.
！Caution: When the Motor is continually accelerating a high inertial load with high
acceleration, the system constantly outputs a high torque exceeding
the rated torque, and thus likely to activate the warning “A3” (Software
thermal). In such a case take a remedy to decrease the load inertia or
to lower the speed.
