Emergency Shutdown (EMO)
- Updated2024-10-21
- 5 minute(s) read
When a test system encounters a serious issue or an emergency is taking place in the facility, operators need the ability to quickly and cleanly power off the test system. EMO mechanisms are included on the RMX-10101/10102 to simplify connectivity and inhibit power switching.
- Pressing the EMO button
- The safety shutoff thermostats detecting an unsafe air exit temperature
- The EMO Measure connector triggers because its signal is driven from high to low
Emergency Shutdown (EMO) Button
You can power down the system by pressing the EMO button and triggering an EMO event. To release the EMO button once it has been pressed, rotate it clockwise. The EMO button will pop outwards once released.
Temperature Controller
The temperature controller will shut off the rack if the internal temperature is greater than or equal to 85°C.
EMO Measure Connector
The RMX-10101/10102 RCU has an EMO Measure connector, which can trigger an EMO event based on the value of the signal passed to the connector.
- Pin 1
- Pin 2
Pin | Signal |
---|---|
1 | 12 V or 24 V |
2 | Ground |
You must pass either a 12 V or 24 V signal to pin 1 to use the EMO Measure functionality. EMO Measure is an active low signal, so driving the signal from high to low triggers an EMO event.
Specification | Description |
---|---|
Mating connector | Molex Micro-Fit 3.0 Receptacle, Molex PN 436450200 |
Wire size | 18 AWG |
Third-Party EMO Connector
The RMX-10101/10102 has a third-party EMO connector that you can use to transfer EMO signals from your rack to third-party devices.
Pin | Signal | Description |
---|---|---|
1 | User EMO +24 V | Accepts a +24 V signal from the EMO circuitry of the third-party equipment connected to the rack. |
2 | System EMO Return | Reads the +24 V signal from pin 4 after it travels through the third-party equipment EMO circuitry. |
3 | User EMO Return | Returns the third-party equipment +24 V EMO signal after it travels through the rack internal EMO circuitry. |
4 | System EMO +24 V | Sends a +24 V signal to the third-party equipment. This signal returns to pin 2. |
5 | No connection | No connection |
Cascading EMO Shutdowns to Multiple Racks
RMX-10101/10102 racks can cascade EMO signals from one rack to other racks connected together in a chain to shut down multiple racks at the same time with one EMO signal.
- Loop back any connector not used in the signal chain.
- Only connect RMX-10101/10102 racks
to the Rack In and Rack Out connectors of other RMX-10101/10102 racks. Connect third-party equipment that
needs to receive the EMO signal to the Third-Party EMO connector.Note Use an EMO Remote cable (PN 769642-01) to connect RMX-10101/10102 racks using the Rack In and Rack Out connectors.
- Only one third party device can be connected to the EMO cascade chain, and must be connected to the Third-Party EMO connector of the final RMX-10101/10102 rack in the chain.
- If you need to cascade an EMO signal to three or more racks, the RCUs in those
racks must be Revision B or newer.Note You can check the revision of the RCU installed in a RMX-10101/10102 rack by accessing the rack system storage MicroSD card using FTP.
Contact NI for support if you have special EMO cascade configuration needs for your system.
Powered Components during an EMO Event
The PEP AUX C13 outlets, RCU AC/DC power outlet, and main Ethernet switch remain powered on during an EMO event.
Related Information
- Power States
The RMX-10101/10102 has multiple states of operation which affect the behavior of the system.
- Powering On After an Emergency Shutdown (EMO) Event