Tesla Model S/X Large Drive Unit ("LDU") - Revision history

P.S.Mangelsdorf: /* Throttle Set Up */

2025-03-15T23:37:35Z

Throttle Set Up

← Older revision		Revision as of 23:37, 15 March 2025
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	The main Open Inverter parameter definition page is located [[Parameters\|here]].		The main Open Inverter parameter definition page is located [[Parameters\|here]].

	=== Throttle ~~Set Up~~ ===		=== Throttle Wiring ===
	[[File:Throttle mod.png\|thumb]]		[[File:Throttle mod.png\|thumb]]
	The Tesla LDU drop in board uses a range of 0-3.3V for the throttle input, however many OEM throttle pedals use a range of 0-5V. This can work, however it presents an issue in the event of a broken throttle pedal. A fix has been implemented in the firmware as of June 2024, which requires a 10k resistor placed in line on the throttle signal. Read more in [https://openinverter.org/forum/viewtopic.php?t=5075 this thread].		The Tesla LDU drop in board uses a range of 0-3.3V for the throttle input, however many OEM throttle pedals use a range of 0-5V. This can work, however it presents an issue in the event of a broken throttle pedal. A fix has been implemented in the firmware as of June 2024, which requires a 10k resistor placed in line on the throttle signal. Read more in [https://openinverter.org/forum/viewtopic.php?t=5075 this thread].

P.S.Mangelsdorf at 23:35, 15 March 2025

2025-03-15T23:35:22Z

← Older revision		Revision as of 23:35, 15 March 2025
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	[[File:Throttle mod.png\|thumb]]		[[File:Throttle mod.png\|thumb]]
	The Tesla LDU drop in board uses a range of 0-3.3V for the throttle input, however many OEM throttle pedals use a range of 0-5V. This can work, however it presents an issue in the event of a broken throttle pedal. A fix has been implemented in the firmware as of June 2024, which requires a 10k resistor placed in line on the throttle signal. Read more in [https://openinverter.org/forum/viewtopic.php?t=5075 this thread].		The Tesla LDU drop in board uses a range of 0-3.3V for the throttle input, however many OEM throttle pedals use a range of 0-5V. This can work, however it presents an issue in the event of a broken throttle pedal. A fix has been implemented in the firmware as of June 2024, which requires a 10k resistor placed in line on the throttle signal. Read more in [https://openinverter.org/forum/viewtopic.php?t=5075 this thread].

P.S.Mangelsdorf: Added information on recurring overcurrent events. Added throttle pedal safety modification information.

2025-03-15T23:34:52Z

Added information on recurring overcurrent events. Added throttle pedal safety modification information.

← Older revision		Revision as of 23:34, 15 March 2025
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	The main Open Inverter parameter definition page is located [[Parameters\|here]].		The main Open Inverter parameter definition page is located [[Parameters\|here]].

			=== Throttle Set Up ===
			[[File:Throttle mod.png\|thumb]]
			The Tesla LDU drop in board uses a range of 0-3.3V for the throttle input, however many OEM throttle pedals use a range of 0-5V. This can work, however it presents an issue in the event of a broken throttle pedal. A fix has been implemented in the firmware as of June 2024, which requires a 10k resistor placed in line on the throttle signal. Read more in [https://openinverter.org/forum/viewtopic.php?t=5075 this thread].




	== Failure Modes ==		== Failure Modes ==
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	# https://www.westside-ev.com/store/p/pfi-fersa-coolant-delete-manifold		# https://www.westside-ev.com/store/p/pfi-fersa-coolant-delete-manifold
	# https://qccharge.com/collections/coolant-delete		# https://qccharge.com/collections/coolant-delete

			=== Over Current Events ===
			Many conversions using the Tesla LDU with the Open Inverter drop in board run into frequent Over Current errors, especially while tuning, and often despite remaining below the programmed over current parameter. These events also seem unusual because the board will require a full power cycle, rather than just a new start input, in order to restart. It is believed that what is actually occurring is a desaturation event, which the Tesla gate drivers are catching and shutting down, and the board is reporting as an over current event. The full power cycle is necessary to reset the gate drivers. Lowering fslipmax appears to address the issue in most cases.

	== Other considerations ==		== Other considerations ==

Smathermather: /* Internal Coolant Leaks */ -- add links to seal fixes

2025-03-15T01:37:14Z

Internal Coolant Leaks: -- add links to seal fixes

← Older revision		Revision as of 01:37, 15 March 2025
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	Anyway, still check the encoder because that part is famous for leaking too and it ruins the motor.		Anyway, still check the encoder because that part is famous for leaking too and it ruins the motor.

			Long term, a leaking seal will develop. Full coolant loop delete as well as performance alternatives that retain cooling for towing and racing applications are available for install to solve leaking seals in LDUs.[https://revoltsystems.com/tesla-large-drive-unit-ldu-coolant-bypass-kit-the-achilles-seal-fix/ <nowiki>[1]</nowiki>][https://www.westside-ev.com/store/p/pfi-fersa-coolant-delete-manifold <nowiki>[2]</nowiki>][https://qccharge.com/collections/coolant-delete <nowiki>[3]</nowiki>]

			# https://revoltsystems.com/tesla-large-drive-unit-ldu-coolant-bypass-kit-the-achilles-seal-fix/
			# https://www.westside-ev.com/store/p/pfi-fersa-coolant-delete-manifold
			# https://qccharge.com/collections/coolant-delete

	== Other considerations ==		== Other considerations ==

Tom91: Categories

2024-12-20T16:59:54Z

Nubster: /* Encoder Plug */ pin mappings

2024-10-20T21:10:01Z

Encoder Plug: pin mappings

← Older revision		Revision as of 21:10, 20 October 2024
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	==== Encoder Plug ====		==== Encoder Plug ====
	A smaller 4 pin LV connector is responsible for the encoder signals. The plug is TE 444046-1; this part is EoL from TE, however the connector is [https://www.aliexpress.com/w/wholesale-444046%2525252d1.html widely available on Aliexpress].		A smaller 4 pin LV connector is responsible for the encoder signals. The plug is TE 444046-1; this part is EoL from TE, however the connector is [https://www.aliexpress.com/w/wholesale-444046%2525252d1.html widely available on Aliexpress].

			Per the [https://openinverter.org/forum/viewtopic.php?p=1026#p1026 Tesla Large Drive Unit Support Thread] :

			* Pin 1 of the Encoder connector to Pin 17 of the 23way ampseal main connector
			* Pin 2 of the Encoder connector to Pin 16 of the 23way ampseal main connector
			* Pin 3 of the Encoder connector to Pin 10 of the 23way ampseal main connector
			* Pin 4 of the Encoder connector to Pin 9 of the 23way ampseal main connector

	'''Contactors'''		'''Contactors'''

P.S.Mangelsdorf at 14:12, 1 April 2024

2024-04-01T14:12:54Z

← Older revision		Revision as of 14:12, 1 April 2024
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	The tuning guide [https://openinverter.org/forum/viewtopic.php?p=15385#p15385 here] has lots of useful information regarding the impact of various parameters on the LDU.		The tuning guide [https://openinverter.org/forum/viewtopic.php?p=15385#p15385 here] has lots of useful information regarding the impact of various parameters on the LDU.

			The main Open Inverter parameter definition page is located [[Parameters\|here]].

	== Failure Modes ==		== Failure Modes ==

P.S.Mangelsdorf: Add links to LDU specific tuning guides

2024-04-01T14:10:39Z

Add links to LDU specific tuning guides

← Older revision		Revision as of 14:10, 1 April 2024
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	[[Tesla Setup FAQ]]		[[Tesla Setup FAQ]]

			== Tuning and Parameters ==
			There are several tuning threads and sets of shared parameters on the Open Inverter Forum. The two most useful collections are: [https://openinverter.org/forum/viewtopic.php?t=195&hilit=parameters Original Parameter Sharing Thread] and the [https://openinverter.org/forum/viewtopic.php?t=126 Tuning Discussion Thread].


			The tuning guide [https://openinverter.org/forum/viewtopic.php?p=15385#p15385 here] has lots of useful information regarding the impact of various parameters on the LDU.

	== Failure Modes ==		== Failure Modes ==

Spiff: Added minor comments about contactor polarity and "Boost" values during low voltage testing.

2023-08-01T23:54:16Z

Added minor comments about contactor polarity and "Boost" values during low voltage testing.

← Older revision		Revision as of 23:54, 1 August 2023
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	==== Encoder Plug ====		==== Encoder Plug ====
	A smaller 4 pin LV connector is responsible for the encoder signals. The plug is TE 444046-1; this part is EoL from TE, however the connector is [https://www.aliexpress.com/w/wholesale-444046%2525252d1.html widely available on Aliexpress].		A smaller 4 pin LV connector is responsible for the encoder signals. The plug is TE 444046-1; this part is EoL from TE, however the connector is [https://www.aliexpress.com/w/wholesale-444046%2525252d1.html widely available on Aliexpress].

			'''Contactors'''

			Please note that the contactors you purchase may have polarity associated with them for the low voltage control signal. If you have problems related to the pre-charge circuit working, or contactors behaving as not expected, check this!

	=== High-Voltage ===		=== High-Voltage ===
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	Supply inverter with some high voltage. For first tests it is recommended to put a large resistor/heating element/kettle in series.		Supply inverter with some high voltage. For first tests it is recommended to put a large resistor/heating element/kettle in series.

	You can start in manual mode using the button on the web interface and enter like 1Hz for „Fslipspnt“ and some value between 10-50 for „ampnom“ to see if the motor spins up. Be careful because manual mode does not enforce a motor speed limit! However, „Fslipspnt“ sets the base speed requested of the motor. Setting it to 1Hz will spin the motor very slowly. Setting it to 5, 10, or 15Hz will spin it progressively faster. For any given speed you will need to experiment with „ampnom“ to find a happy place where enough current is allowed to flow but not too much. Finding a good set of values should make your motor spin reasonably smoothly.		You can start in manual mode using the button on the web interface and enter like 1Hz for „Fslipspnt“ and some value between 10-50 for „ampnom“ to see if the motor spins up. Be careful because manual mode does not enforce a motor speed limit! However, „Fslipspnt“ sets the base speed requested of the motor. Setting it to 1Hz will spin the motor very slowly. Setting it to 5, 10, or 15Hz will spin it progressively faster. For any given speed you will need to experiment with „ampnom“ to find a happy place where enough current is allowed to flow but not too much. Finding a good set of values should make your motor spin reasonably smoothly. Also check the „Boost“ as it may require an increased value of 5000-10000.

	You may also set parameter „udcsw“ and „udcmin“ to 0 and start drive mode by pulsing 12V on „Start“. Then connect a pot between 5V, GND and „Pot“ (wiper). This will also spin the motor AND enforce a speed limit.		You may also set parameter „udcsw“ and „udcmin“ to 0 and start drive mode by pulsing 12V on „Start“. Then connect a pot between 5V, GND and „Pot“ (wiper). This will also spin the motor AND enforce a speed limit.

Jason arnold: /* Specs: */

2023-07-25T07:23:00Z

Specs:

← Older revision		Revision as of 07:23, 25 July 2023
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	== Overview ==		== Overview ==
	[[File:Tesla LDU.jpg\|alt=Tesla LDU\|thumb]]		[[File:Tesla LDU.jpg\|alt=Tesla LDU\|thumb\|Tesla Large Drive Unit]]
	The Tesla Model S/X Large ~~Rear~~ Drive Unit was the first drive unit produced by Tesla dating back to the launch of the Model S in 2012.		The Tesla Model S/X Large Drive Unit (LDU) was the first drive unit produced by Tesla dating back to the launch of the Model S in 2012. Applications include RWD Model S & X, as well as performance AWD S & X - in both cases serving as the rear drive unit.

	=== Specs: ===		=== Specs: ===
	~~Weight: 291 lbs (132 kg)~~

	Input Voltage: 240-404V DC		* Weight: 291 lbs (132 kg)
			* Input Voltage: 240-404V DC
	Power: 335 kW (~450HP) to 475 kW (~636 HP) depending on configuration		* Power: 335 kW (~450HP) to 475 kW (~636 HP) depending on configuration
			* Torque: 450 Nm (~332 ft/lb) to 650 Nm (~480 ft/lb) depending on configuration
	Torque: 450 Nm (~332 ft/lb) to 650 Nm (~480 ft/lb) depending on configuration		* Max RPM: 18,000
			* Gear ratio: 9.73:1
	Max RPM: 18,000

	Gear ratio: 9.73:1

	== Connections ==		== Connections ==

← Older revision		Revision as of 16:59, 20 December 2024
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	== Other considerations ==		== Other considerations ==
	The motor itself will run as well in the reverse direction as in the forward direction. However if you are running the gearbox integrated with the drive unit in reverse you will want to replace the gearbox's oil pump with a reverse oil pump. These can be found on ZeroEV. [https://zero-ev.co.uk/product/tesla-large-drive-unit-replacement-reverse-drive-oil-pump/?v=3a52f3c22ed6]		The motor itself will run as well in the reverse direction as in the forward direction. However if you are running the gearbox integrated with the drive unit in reverse you will want to replace the gearbox's oil pump with a reverse oil pump. These can be found on ZeroEV. [https://zero-ev.co.uk/product/tesla-large-drive-unit-replacement-reverse-drive-oil-pump/?v=3a52f3c22ed6]
			[[Category:Tesla]] [[Category:Motor]] [[Category:Inverter]] [[Category:Gearbox]]
	~~[[Category:OEM]]~~ [[Category:Tesla]] [[Category:Motor]] [[Category:Inverter]] [[Category:Gearbox]]
	<references />		<references />

	== CAD ==		== CAD ==
	An amazing-quality solid model of this drive unit has been [https://grabcad.com/library/tesla-rear-drive-unit-1 made available on GrabCAD] by Winston Jennings.		An amazing-quality solid model of this drive unit has been [https://grabcad.com/library/tesla-rear-drive-unit-1 made available on GrabCAD] by Winston Jennings.