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.

Operators may use the EMO to reset a system in an error state, prevent damage to a DUT, or even prevent harm to themselves. The following events trigger an EMO event:
  • 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
EMO immediately cuts AC power from the PEP to the PEP C19 power outlets and the fan outlets.
Figure 1. EMO Architecture

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.

Figure 1. EMO Measure Connector Location
Figure 39. EMO Measure Connector Pinout
  1. Pin 1
  2. Pin 2
Table 63. EMO Measure Connector Pins
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.

To use EMO Measure, the mfgconfig.json file ITA node must be populated with exactly one element which specifies EMOMeasureEnabled as true. This function is not enabled by default.
Note Contact NI to get support modifying mfgconfig.json.
Table 41. EMO Measure Mating Connector Specifications
SpecificationDescription
Mating connectorMolex Micro-Fit 3.0 Receptacle, Molex PN 436450200
Wire size18 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.

Figure 1. Third-Party EMO Connector Location
Figure 1. Third-Party EMO Connector Pinout
Table 42. Third-Party EMO Connector Pins
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.

Figure 1. EMO Cascade Connection Example
Adhere to the following conditions to successfully chain multiple racks together to facilitate cascading EMO signals:
  • 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.

Note PEP AUX C13 outlets are not powered on during an overtemperature thermal fault.
PEP AUX C13 outlets are limited to outputting 250 W of power across all outlets.
Figure 1. RMX-10140-16S2 Single-Phase PEP Powered Components in EMO


Figure 1. RMX-10140-24S2 Single-Phase PEP Powered Components in EMO


Figure 1. 3-Phase PEP Powered Components in EMO