Duratrax ESC 7550 User Manual

ESC 7550

electronic speed control with reverse

OPERATING INSTRUCTIONS

Introduction to ESC 7550 Instructions

The following instructions will help you get trouble-free operation from your electronic speed control (ESC). These simple steps will allow your ESC to achieve maximum performance and minimize the chance of problems due to incorrect installation. Consult the speciﬁcations listed below for limitations for this ESC. You should always ask your hobby dealer or call our service department before using the ESC for an application other than what is listed in these instructions. PLEASE FOLLOW ALL INSTRUCTIONS CAREFULLY!

Special Features

✷ The ESC 7550 is designed to be used with up to 75A

peak motors.

✷ Motor, battery, and radio connectors are pre-installed. ✷ High frequency operation provides very smooth

control, maximizes battery run time, and reduces operating temperatures.

✷ LED indicators (non-setup) are green (neutral), ﬂashing

red for reverse, and red for forward throttle.

✷ Automatic setup – No programming necessary. ✷ Thermal protection – Motor pulses when temperature

reaches 200º F

✷ Led indicators for neutral, full throttle, and full brake. ✷ Aluminum heat sink – Maximum cooling. ✷ Reverse with brakes – Brakes are applied when pushing

forward on trigger. Reverse is applied after releasing trigger and pushing forward again.

Speciﬁcations

Input voltage: 7. 2 – 8 . 4 V Power output: 75A at 77ºF, 50A at 200ºF Motor limit: Mabuchi 380 BEC output: 5.0 V /1A On resistance: 0.005 Size: 33.5 x 27 x 20mm (With heat sink) Weight: 11. 7g

Important Precautions

(ESC = Electronic Speed Control)

✷ Do not run the car near water! Never allow water,

moisture, or any foreign material inside the case of the ESC.

✷ Never use more than 7 cells (8.4 volts total) in the

battery pack.

✷ Do not attempt to connect the battery pack to the

ESC in reverse, as permanent damage to the ESC could result.

✷ Do not mix instructions. If you are building a vehicle

that has a mechanical speed control, do not use the wiring diagram included with the vehicle.

✷ Never cut or splice the ESC input wires. Do not

connect a battery to the receiver’s (Rx) “battery” slot. The Rx receives power through the ESC itself which plugs into the Rx’s throttle channel slot.

✷ Always disconnect the battery pack from the ESC when

not in use.

✷ Never turn on the ESC before plugging it into the Rx

and switching on the transmitter (Tx).

✷ Do NOT use LiPo batteries with this ESC.

Mounting the Speed Control

The following information can help the ESC perform at maximum efﬁciency and minimize the chance of overheating and radio interference problems.

Mounting the Speed Control (Figure 1)

1. Locate the ESC in a position to allow for good airﬂow, with as little obstruction from the model’s outer body or exterior dirt and debris as possible. Maintaining a clean ESC and achieving good airﬂow across the unit is very important for keeping the ESC cool and maximizing performance.

2. Mount the ESC using double-sided mounting tape.

3. Mount the ON/OFF switch in a convenient place. Ensure that it is securely mounted using mounting tape in a location where it cannot be easily turned off by objects on the track or rough terrain.

Mounting the Receiver

1. Radio interference can cause the ESC to rapidly switch between forward and reverse, overheating the transistors and possibly damaging the ESC. The Receiver (Rx) and its antenna should be mounted as far away from the ESC as possible. Also, try to keep the Rx away from the motor, battery, power wires, servos, or any large piece of metal - such as a metal chassis.

2. Make sure the Rx antenna can be fully extended through an antenna tube and not completely enclosed inside the model. Do NOT cut or coil the Rx antenna.

Transmitter Adjustments

Clip off this tab

Adjusting your transmitter (Tx) is critical for proper speed control operation. The Tx throttle adjustments are described below:

✷ ATV, EPA, or ATL - set all to maximum. ✷ Throttle Trims and Sub Trims - set all at neutral or zero.

Radio Connector Polarities

The connector included on the ESC directly ﬁts Futaba receivers. By simply clipping off the tab on the side of the connector using wire cutters, it can be directly connected to any Airtronics “Z,” Hitec “S,” or JR receivers. For proper connection refer to your radio’s manual.

Troubleshooting Guide

Motor Preparation

Your motor will require three 0.1µF capacitors to be soldered as shown. These capacitors will help prevent RF feedback from adversely affecting the motor.

Speed Control Set-up

1. Switch on the transmitter.

2. Set the throttle trim to the middle setting.

3. Set the throttle reversing switch to the reverse setting.

4. Connect the battery to the ESC.

5. Switch on the ESC, the LED should alternate between red and orange. This will last a few seconds while the ESC sets the neutral point.

6. Once the LED is solid you will hear a series of 3 beeps. The ESC is now set and should work normally.

7. Apply throttle gently to check that the motor is running the

correct direction. If the motor runs backwards, set the throttle reversing switch to the reverse setting and turn the ESC off / on again to reset neutral.

ESC Does Not Work

Problem: Motor and/or steering servo do not move.

1) Recharge dead batteries.

2) Check for faulty power connections.

3) Check for a damaged connection between ESC and Rx.

4) Internal damage. Unit may require service. See “Service Procedures.”

Problem: No reverse.

1) Tx adjusted incorrectly. Repeat “Transmitter Adjustments.”

2) Improper setup. Repeat “Speed Control Set-Up.”

3) Reverse transistors might be damaged, and unit may require service. See “Service Procedures.”

Problem: Case is melted.

Internal damage and unit requires service. See “Service Procedures.”

Problem: ESC runs with switch off.

Unit will require service. See “Service Procedures.”

ESC Works But Other Problems Exist

Problem: Rx glitches or stutters during acceleration.

1) The required motor capacitors are not installed or have broken. Re-check all capacitors.

2) Rx mounted too close to ESC causing interference. Relocate Rx away from ESC.

3) Check for faulty power connections.

Problem: Model runs slowly or has no acceleration.

1) The ESC is not set up properly. Repeat Repeat “Speed Control Set-Up.”

2) Check for faulty battery and/or motor connections.

3) Tx is improperly adjusted. Repeat “Transmitter Adjustments.”

4) Check that the battery is fully charged.

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