3-2 Servomotor Specifications
3-2-3 Encoder Specifications
Temperature Characteristics of the Servomotor and Mechanical
System
•
SMARTSTEP Junior Servomotors use rare earth magnets (neodymium-iron
magnets). The temperature coefficient for these magnets is approximately –0.13%/°C.
As the temperature drops, the Servomotor's maximum momentary torque increases,
and as the temperature rises, the Servomotor's maximum momentary torque
decreases. The maximum momentary torque is about 4% higher at –10°C compared to
the normal temperature of 20°C. Conversely, the maximum momentary torque
decreases about 8% when the Servomotor warms up to 80°C from the normal
temperature of 20°C.
•
Generally, when the temperature drops in a mechanical system, the friction
torque and the load torque increase. For that reason, overloading may occur at low
temperatures. In particular, in systems that use a Decelerator, the load torque at low
temperatures may be nearly twice the load torque at normal temperatures. Check with
a current monitor to see whether there is overloading at low temperatures. Also check
operation at high temperatures to see whether there is abnormal Servomotor
overheating or alarms.
•
An increase in load friction torque visibly increases load inertia. Therefore, even
if the Servo Driver parameters are properly adjusted at a normal temperature, the
Servomotor may not operate optimally at low temperatures. Check operation at low
temperatures to see whether operation is optimal in those conditions, too.
3-2-3 Encoder
Specifications
Item
Specification
Encoder method
Optical encoder (incremental encoder)
Number of output pulses
Phase A, B: 256 waves/revolution
Phase Z: 1 pulse/revolution
Power supply voltage
5 VDC ±5%
Power supply current
70 mA max.
Output signals
+A, –A, +B, –B, Z, U, V, and W
+A, –A, +B, and –B
Sine wave voltage output
Output interface
Z, U, V, and W
Transistor output
3-16
Summary of Contents for SMARTSTEP Junior R7D-ZP
Page 3: ...2 ...
Page 18: ...Section 1 Configuration Features and System ...
Page 25: ...1 5 Applicable Standards 1 5 2 UL and cUL Standards 1 8 ...
Page 26: ...Section 2 Dimensions Standard Models and ...
Page 36: ...Section 3 Specifications ...
Page 62: ...Section 4 System Design ...
Page 86: ...Section 5 Operation ...
Page 96: ...Section 6 Troubleshooting ...
Page 109: ...6 5 Periodic Maintenance 6 5 3 Replacing the Cooling Fan 6 14 ...
Page 110: ...Appendix ...
