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student_documentation:relay [2021/02/11 17:48] – external edit 127.0.0.1student_documentation:relay [2024/07/03 02:22] (current) – Beni Ammann
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 ====== Relay ====== ====== Relay ======
  
-{{:student_documentation:shutdownrelay.jpg?nolink|}}+{{:student_documentation:open_bb_with_relais.png?800|}}
  
-The relay contacts (SPDT) are intended to be used to shut the engine off. Connect these contacts to your motor controller or ignition controller. Directly switching the ignition coil primary winding is not permitted because it generates strong EMI emissions which may lead to On-Board Computer malfunction. <del> Installing the normally closed (NC) relay contacts of the relay in series with the primary of the ignition coil will achieve the desired results. As an option, the NC relay contact could be wired in series with the fuel injector to achieve the same results.+The relay contacts (SPDT) are intended to be used to disable the vehicle propulsion system when activitated. 
 +  
 +Connect these contacts to your motor controller or engine controller.  
 +You can use ether one of the relais.
  
-For Diesel engines, installing the NC relay contacts in series with a fuel shutoff solenoid or in series with the fuel injector will kill the engine when the relay is activated.</del>+Directly switching the ignition coil primary winding is not permitted because it generates strong EMI emissions which may lead to On-Board Computer malfunction. Wiring your relay in series with the E-Stop is not permitted as well.  
 + 
 +There are several options for connecting the shutdown relay. Teams should choose ONLY one option to implement. Other methods will be accepted as long as the drive system is disabled when the relay is activated 
 + 
 +Before the event, teams should identify and test with a switch the circuit that will be wired through the shutdown relay. 
 + 
 +The maxumum current flowing through the Relais must not exceede 2 Ampere
  
-Before the event, teams should identify the circuit that will be wired through the shutdown relay. 
  
 ===== ICE ===== ===== ICE =====
  
-  * The shutdown relay must turn off the engine when the relay is activated. +The shutdown relay must kill the engine when the relay is activated.
-  * Connections can made be from N to NC (Normally Closed, will open when relay is activated) or from N to NO (Normally Open, will close when relay is activated) depending on system configuration +
-  * Maximum current = 10 amps+
  
  
 +Connections can made be from N to NC (Normally Closed, will open when relay is activated) or from N to NO (Normally Open, will close when relay is activated) depending on system configuration
  
-IT IS REQUIRED TO CONNECT THE SHUTDOWN RELAY DIRECTLY TO THE ECU, RATHER THAN TO THE IGNITION COIL DUE TO EMI PROBLEMS+ 
 +**Maximum current = 2 amps** \\ 
 +**Maximum voltage = 24 volt** \\ 
 + 
 + 
 + 
 +  * Option 1 – directly enables engine ECU (NC) 
 +  
 +  * Option 2 – directly disables engine ECU (NO)  
 + 
 +  * Option 3 – Connected in series (NC contacts) with deadman switch if electronic 
 + 
 +Examples for ICE 
 +{{ :student_documentation:Shutdown_Relay_ICE.JPG?nolink&400 |}} 
 + 
 +THE SHUTDOWN RELAY MUST NOT BE CONNECTED TO THE IGNITION COIL. 
  
  
 ===== BE & H2 ===== ===== BE & H2 =====
  
-The shutdown relay must disable vehihle propulsion when the relay is activated.+The shutdown relay must disable vehicle propulsion when the relay is activated. 
 + 
 Connections can be made from N to NC (Normally Closed, will open when relay is activated) or from N to NO (Normally Open, will close when relay is activated) depending on system configuration. Connections can be made from N to NC (Normally Closed, will open when relay is activated) or from N to NO (Normally Open, will close when relay is activated) depending on system configuration.
-Maximum relay current = 10 amps. 
-  * Option 1 disables throttle input when activated 
-  * Option 2 disables motor control when activated 
-  * Option 3 grounds motor controller when activated 
-Other methods will be accepted as long as the drive system is disabled when the relay is activated 
  
-Shutdown Relay Connection Examples 
  
-{{ :student_documentation:be_shutdownrelay.jpg?nolink&400 |}}+**Maximum current = 2 amps** \\ 
 +**Maximum voltage = 24 volt** \\ 
 + 
 +  * Option 1 - disables motor control when activated 
 +    * NC contacts on motor controller on/off 
 +  * Option 2 - grounds motor controller when activated 
 +    * NO contacts for motor controllers with this feature 
 +  * Option 3 - disables throttle/speed input when activated 
 +    * NC contacts to remove motor controller throttle input.  
 + 
 +Note, you may need to install and pull up/pull down resistor for correct motor controller operation when relay is activated. 
 + 
 +Examples for BE and H2 
 +{{ :student_documentation:Shutdown_Relay_BE.JPG?nolink&400 |}} 
 + 
 +THE SHUTDOWN RELAY MUST NOT BE CONNECTED TO THE E-STOP.  
 + 
 + 
 + 
 + 
Log In (for D&T Team and Volunteers ONLY) student_documentation/relay.1613065701.txt.gz · Last modified: 2021/02/11 17:48 by 127.0.0.1

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