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EV.5.7 Voltage Indicator
Each Accumulator Container must have a prominent indicator when High Voltage T.9.1.1 is present at the vehicle side of the AIRs
EV.5.7.1 The Voltage Indicator must always function, including when the Accumulator Container is disconnected or removed
Rules Reference - T.9.1.1
Rules Reference - T.9.1.1
T.9.1.1 High Voltage – HV
Any voltage more than 60 V DC or 25 V AC RMS
The Accumulator Container, while having High Voltage (HV), must have an indicator which functions regardless of whether the container is connected, disconnected, or removed from the vehicle. High Voltage, as stated in T.9.1.1 is defined as DC voltage greater than 60V, or AC voltage greater than 25VRMS.
EV.5.7.2 The voltage being present at the connectors must directly control the Voltage Indicator using hard wired electronics with no software control.
The present voltage at the connectors, meaning poles of the Accumulator, should be directly controlling the Voltage Indicator without any kind of software or component interference. The Voltage Indicator should be completely representative of the state of the Accumulator Container's voltage potential. Additionally, these connections must be made using hard wired electronics, which are designed to be connected to a device using physical wires or cables, as opposed to wireless or plug-and-play connections. These kinds of connections are less susceptible to the effects of electromagnetic interference (EMI) and vibration. Our configuration is shown to the right.
Photo - Hard Wired Electronics
Photo - Hard Wired Electronics
EV.5.7.3 The control signal which closes the AIRs must not control the Voltage Indicator
The control signal used to close the AIR's is enabled when High Voltage (HV) is ready to exit the Precharge Circuit. You would think this means that if you were to power this light with the same signal used to close the AIR's, then that would be an equivalent indicator of High Voltage presence. This, however, is not the case. For the sake of redundancy and a physical confirmation that there is truly High Voltage in the system, this indicator must be controlled in a different way. Ultimately, you actually have to measure the voltage, and you can't just say that because the AIR's are closed, high voltage is automatically present outside of the Accumulator.
EV.5.7.4 The Voltage Indicator must:
a. Be located where it is clearly visible when connecting/disconnecting the Accumulator Tractive System connections
b. Be labeled “High Voltage Present”
Photo - Voltage Indicator
Photo - Voltage Indicator
These rules place an emphasis on accessibility across teams, in that they require conformance to guidelines that make it easier to identify critical safety components across different cars. The Voltage Indicator, as stated in EV.5.7.4.a, must be immediately and easily visible to anyone who is going through the process of handling the High-Voltage connections. According to EV.5.7.4.b, this indicator should be labeled "High Voltage Present" so that any untrained eye is able to conclude whether or not the Container is energized.
Our High Voltage Indicator is shown to the left, the small green LED.
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