
Descri
tion
Design.
Date Ed
1
2005.7.15
SHEET
DRAW. No.
CUST.
TITLE
Taka
ama
Newly designed
Notice of the Update of Digital Servo
Software for Series 30i/31i /32i
90D0
10 & 90E0/10
B-65270EN/05-002
FANUC LTD
5
16
01
Detection of an Overheat Alarm by Servo Software when Linear Motor and
Synchronous Built-in Servo Motor are used.
(1) Overview
When a linear motor and a synchronous built-in servo motor are used, the
motor overheat signal cannot be posted to the CNC via a detector. Therefore,
to detect a motor overheat, alarm processing for the thermostat signal had to
be performed by a PMC ladder. (For details, refer to Section 2.5,
"THERMOSTAT CONNECTION", in Part III, "HANDLING, DESIGN, AND
ASSEMBLY", in "FANUC LINEAR MOTOR Lis series DESCRIPTIONS
(B-65382EN).)
This function uses servo software to monitor the thermostat signal applied to
DI and issues a servo alarm (motor overheat) when an overheat occurs. Use of
this function eliminates the need to perform alarm processing by using the
PMC ladder.
In addition, when an overheat alarm is issued, quick stop processing (quick
stop function with velocity command 0) can be used. (For details, see FANUC
AC SERVO MOTOR α
i/ βi series PARAMETER MANUAL (B65270EN/05)
Subsection 4.11.5, "Quick Stop Function at OVL (Motor Overheat) and OVC
(Over Current) Alarm".)
Conventional overheat processing
Linear
motor
PMC
controller
CNC
controller
CNC
ladder program created by
the machine tool builder
detects an alarm and transfers
it to the CNC.
Thermo-
stat
The CNC performs
emergency stop processing.
Servo
controller
Emergency
stop
Overheat processing when this function is used
Linear
motor
CNC
Thermo-
stat
The thermostat
status is posted to
the servo CPU and
is detected as a
servo alarm.
Servo
controller
Thermostat
status
larm
PMC
controller
CNC
controller