3.8 Special Wiring
159
9)
Absolute Encoder Home Position Error Detection
Cn-02 Bit 1
Absolute Encoder Home
Position Error Detection
Factory
Setting: 0
For Speed/Torque Control
and Position Control
This memory switch is used to specify whether to use
home position error detection
(alarm A.80) when an absolute encoder is used.
Setting Meaning
0 Detects a home position error.
1 Does not detect a home position error.
Normally, set this memory switch to “0.”
This memory switch has no significance when an incremental encoder is used.
3.8.6 Extending an Encoder Cable
1) Both incremental and absolute encoders have a standard encoder cable (maximum 20
meters (65.6 ft.)). If a longer cable is required, prepare an extension cable as described
below. The maximum allowable cable length is 50 meters (164 ft.).
a) 3-meter (19.8 ft.) Cable with Connectors:
•
For incremental encoder: DP9320082-1
•
For absolute encoder: DP9320084-1
TERMS
Home position error detection
This function detects an encoder count error resulting from noise. It checks the number of
pulses per motor revolution, and outputs a home position error alarm if that number is incor-
rect.
If the absolute encoder detects an error, it inverts phase C and notifies the Servopack of the
error. In this case, this “home position error detection” function also works.
3
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