6. Power-saving Function
Fieldbus Communication
179
RCP6
6.2.1 Process When Feature is Active
1) The same process as the existing complete stop feature will be performed until the current
flow volume reaches the current limit value at the positioning stop (parameter).
2) The condition will be retained until the target position deviation becomes zero after finishing
the stopping current flow.
3) Current flow volume will be controlled following the fact of target position deviation.
• Current reduced gradually by certain amount when no target position deviation
• Current increased gradually by certain amount when there is target position deviation
There are some restrictions as follows to the current flow control.
• When current flow transition of reduction to increasing process is held for more than certain
times, only the increasing process will be held.
• The minimum current volume should be defined for every actuator, and the current flow volume
will be reduced to a certain amount when there is no position deviation.
• The maximum current volume should be the current limit value at positioning stop (parameter),
and the current flow volume will be increased to a certain amount.
6.2.2 Caution
(1) Deference in Target Position Deviation due to Encoder Resolution
for Actuator with Lead Length 24 [mm/rev]
1) When the encoder resolution is 800 [pulse/rev], the current flow volume will be decreased
until the target position deviation of 24 / 800 = 0.0300 [mm] occurs.
2) When the encoder resolution is 8192 [pulse/rev], the current flow volume will be increased
until the target position deviation of 24 / 8192 = 0.029… [mm] occurs.
(2) Caution in High-Resolution Encoder
In an actuator equipped with the high-resolution encoder, if the positioning complete status
continues for a long while, the current flow volume rises to the current limit value at
positioning stop (parameter) at last even if this feature is activated. Therefore, note that
power consumption cannot be saved in such a situation.
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