Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 660)

Section 13A
Connecting 8520 Digital Drive Systems
13A-26
Table 13A.P lists the general motor specifications that apply to all of the
previously listed 8500 digital servo motors.
Table 13A.P
8500 Digital Servo Motor General Specifications
Item Specification
Ambient Temperature 0 ° C to +40 ° C
Ambient Humidity 20-80% (No Dew Condensation)
Brake Voltage 90V dc
Brake Holding Torque A Series - 90 Kg - cm 16.2 watts
B Series - 360 Kg - cm 31 watts
Drive Method Direct Drive
Enclosure Totally-enclosed, Self-Cooled
(Equivalent to IP-55 Rating)
Excitation Method Permanent Ferrite Magnet
Isolation Voltage 1500 V ac, 1 min.
Insulation Resistance 500 V dc, 10M Ohms or more
Mounting Flange Mounted
Oil Seal Nitril Rubber 1
Thermostat N.C. - Opens at 155 ° C ± 5 ° C
- Closes at 110 ° C ± 20 ° C
1 Oil sealed motors should be operated under the following conditions:
· Optimum oil level should be below the oil seal lip
· Oil should be splashed to oil seal
All 8500 digital servo motors listed are equipped with thermal overload
switches. These are normally closed switches that open when the motor
temperature exceeds a safe limit.
The system installer has two choices for implementing these safety
switches. They can be wired directly into the E-STOP string, or they can
cause an input to PAL through an I/O device.
Wiring these switches directly into the E-STOP string provides an
immediate and very reliable response to over-temperature conditions. The
disadvantage in doing this is that the drives will be shut down no matter
where the machine is in an operation and cannot be restarted until the
over-temperature condition is resolved.
If the over-temperature switches are wired as inputs to PAL, the PAL
program can be written to handle the situation in a controlled manner. PAL
can be programmed to allow the completion of an operation, or to move
the axes to a safe position before shutting down the machine.