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The mechanical action indicator of the Omron MY4N-GS-R miniature power relay is one of the core practical designs of this model, with three main functions as follows:
- Judge Contact Status Without Power Supply
The mechanical action indicator is a physical component linked to the relay contacts, which will switch positions synchronously with the closing/opening of the contacts. During power-off maintenance and circuit debugging of equipment, there is no need to connect the control power supply. By visually observing the position of the indicator, you can quickly determine whether the relay contacts are in the Normally Open (NU) or Normally Closed (NC) state, greatly improving maintenance efficiency.
- Quickly Locate Fault Points
During troubleshooting of the control system, the fault type can be judged by comparing the status of the mechanical indicator with the status of the LED indicator light:
If the LED light is on (the coil is energized) but the mechanical indicator does not act → it is highly probable that the relay coil is energized but the contacts are stuck or the mechanical structure is faulty.
If the LED light is off but the mechanical indicator acts abnormally → the contacts may be stuck by external force, or there may be a mis-trigger caused by a short circuit in the circuit.
- Simplify the Inspection Process of Multi-relay Parallel Control
In scenarios where multiple MY4N-GS-Rs work in parallel in an industrial control cabinet, inspectors do not need to measure the coil voltage or contact on-off status one by one. By scanning the positions of the mechanical indicators, they can quickly confirm the working status of each relay, reducing the maintenance cost of batch equipment.
Omron MY4N-GS-R Mechanical Indicator and LED Indicator Light Status Comparison Table
This table is used to quickly judge the working status and fault type of the relay. Printre ei, the LED of the AC coil is orange, and the LED of the DC coil is green.
| Coil Type | LED Indicator Light Status | Mechanical Indicator Status | Corresponding Working Condition | Fault Troubleshooting Direction |
| AC/DC | On (corresponding color) | Actuated (deflected synchronously with contact closure) | Normal operation | The coil is energized, and the contacts have completed closing and switching |
| AC/DC | Off | Reset (initial position) | Normal power-off | The coil is not energized, and the contacts remain in the initial state |
| AC/DC | On | Reset (no action) | Mechanical fault | 1. Contact jamming, mechanical structure damage |
| 2. Insufficient magnetic force when the coil is energized (low voltage) | ||||
| AC/DC | Off | Actuated (deflected state) | Mechanical jamming/mis-trigger | 1. The indicator or contacts are stuck by external force |
| 2. The contacts are not reset before the equipment is powered off | ||||
| 3. Instantaneous short circuit in the coil circuit causes mis-closure | ||||
| AC/DC | Flashing | Alternating between actuation and reset | Unstable coil voltage | 1. Excessive voltage fluctuation of the control power supply |
| 2. Loose coil wiring and poor contact | ||||
| AC/DC | On | Actuated, but the load does not work | Contact fault | 1. Poor contact caused by contact ablation and oxidation |
| 2. Wrong wiring or open circuit in the load circuit |
