Omron OMNUC FND Series User Manual page 244

Specifications
Generally, in a mechanical system, when the temperature drops the friction torque increases and the
load torque becomes larger. For that reason, overloading may occur at low temperatures. In particu-
lar, in systems which use deceleration devices, the load torque at low temperatures may be nearly
twice the load torque at normal temperatures. Check with a current monitor to see whether overload-
ing is occurring at low temperatures, and how much the load torque is. Likewise, check to see wheth-
er there abnormal Servomotor overheating or alarms are occurring at high temperatures.
An increase in load friction torque visibly increases load inertia. Therefore, even if the Position Driver
parameters are adjusted at a normal temperature, there may not be optimal operation at low temper-
atures. Check to see whether there is optimal operation at low temperatures too.
j Incremental Encoder Specifications
Item
Encoder method
Number of output pulses
Power supply voltage
Power supply current
Pulse duty characteristics
Phase characteristics
Phase relationship
Maximum rotation speed
Maximum response frequency
Output signals
Output interface
Serial communications data
Serial communications method
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Optical incremental encoder
A, B phase: 2,048 pulses/revolution, Z phase: 1 pulse/revolution
5 VDC 5%
DC, 350 mA (for load resistance of 220 Ω)
50% 10%
90 43.2
For rotation in the CW direction, A phase is advanced by 90 compared
to B phase.
4,500 r/min
153.6 kHz
+A, –A, +B, –B, +S, –S
Conforming to EIA RS-422A.
Output based on AM26LS31CN or equivalent.
Z phase, poll sensor, U, V, W phase
Combination communications method based on A, B, and S phases.
Standards
Chapter 5
5-21