TEHCM Interface Board Manual - Community Spice

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BAUER CONTROLSResistor Value2.32 kOhm + 4.34kOhm + 8.3 kOhmDIO NameTAP2_EN &TAP3_ENTransmissionStateOutputVoltage% ofPowerSupplyD 2.86 V 23.9%The following figure shows the connectors, pin assignments, andsignal path for the tap up/down voltage.PowerConnectorPower Supply MonitorThe BTIB contains electronic circuitry that protects itself and theTEHCM if an overload condition occurs. The electronic circuitconstantly monitors the current and disables the power to the TEHCMif an overload of 10 amps or more occurs for more than 20milliseconds.If an overload condition occurs, the MOSFET transistor turns off,disabling the power to the TEHCM. The monitoring circuit remainsdisabled until PCS turns the control signal (EN_PWR_n, located on theP40 connector) off and then back on.The LEDs on the BTIB indicate the power state:• Green LED—The TEHCM power is enabled.• Red LED—An overload is occurring and the TEHCM is connected.• Both LEDs on at half intensity—The TEHCM is not connected.A 0.03 Ohm resistor and a MOSFET transistor are in series with theadjustable power supply. An integrated circuit monitors the current ofthe 0.03 Ohm resistor.16 / Signal Routing November 13, 2008
TEHCM INTERFACE BOARD MANUALAn additional amplifier on the BTIB monitors the same voltage dropacross the same 0.03 Ohm resistor with a fixed gain of 50 volt/volt.Therefore:BATT_I_n = 1.5 * I TEHCMWhere n = the instance of the analog signal and I TEHCM = TEHCMcurrent.The following figure shows the connectors, pin assignments, andsignal paths for the power signals.November 13, 2008 Signal Routing / 17
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Page 8 and 9: BAUER CONTROLS• P26—Ribbon cabl
Page 10 and 11: BAUER CONTROLSHowever, digital sign
Page 14 and 15: BAUER CONTROLSThe following table l
Page 16 and 17: BAUER CONTROLSThe following table l
Page 18 and 19: BAUER CONTROLSThe ignition, access,
Page 22 and 23: BAUER CONTROLSLoopbackThe T90 TEHCM
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Page 38 and 39: BAUER CONTROLS34 / Schematics Novem
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TEHCM Interface Board Manual - Community Spice

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