Clarify the zero-point reference and proximity-sensor logic for forward and reverse rotation of rotary tables. This document prevents confusion during service and function testing.
2. Applicable Models
유형
Controller
Representative Models
Rotation Method
에이
IMC400
VHA, VHL
Servo Rotation
B
IMC700 / IMC710
VHG5
Servo Rotation
3. Zero-Point Reference
Model
Zero-Point Position
Controller Logic Reference
VHA / VHL (IMC400)
Reverse-rotation completion position
Set ZRO (0°) at reverse-rotation completion
VHG5 (IMC700/710)
Forward-rotation completion position
Set ZRO (0°) at forward-rotation completion
4. Proximity Sensor Logic
Item
VHA/VHL (IMC400)
VHG5 (IMC700/710)
Remarks
Forward rotation complete sensor
Signal ON (1) = complete
Signal OFF (0) = complete
Logic inverted
Reverse rotation complete sensor
Signal ON (1) = complete
Signal OFF (0) = complete
Logic inverted
During rotation (intermediate)
Both sensors = OFF
Both sensors = ON
Signal inversion
Reference direction
Reverse-rotation completion
Forward-rotation completion
Controller difference
5. Checklist for Functional Test
Inspection Item
VHA/VHL (IMC400)
VHG5 (IMC700/710)
Evaluation Criteria
Forward/Reverse operation
Normal rotation in both directions
Same
Verify signal at completion
Proximity sensor operation
Sensor ON at completion
Sensor ON during rotation
Check sensor status
Zero-point confirmation
Reverse-rotation completion position
Forward-rotation completion position
Display = 0°
Position restore after restart
Normal
Normal
Zero maintained after power re-apply
6. Service Notes
Model Identification
IMC400 and IMC700/710 use different rotation logic. Confirm controller version first.
Sensor Reuse Caution
For logic-inverted models (VHG5), set sensor ON/OFF input as reversed.
Software Parameter
Do not change the Zero reference within the standard control logic.
If Zero Mismatch Occurs During Test
Check sensor input (IO monitor) → rotation direction → controller version in order.
7. Summary
VHA/VHL (IMC400): Zero = Reverse-rotation complete, Sensor = Completion state
VHG5 (IMC700/710): Zero = Forward-rotation complete, Sensor = During rotation → Because the logic is inverted, confirm the model-specific reference before all function tests and service operations.
