Introduction
Thank you for purchasing the FLASH series. To
get the best from your FLASH series, please
read this manual carefully. After reading it, besure to keep it in a convenient location.

Ultra-small digital speed controller Instruction Manual
Features of the super-small digital speed controller FLASH series• Featuring 24 of the latest POWER MOS FET (SOP [note 1] ) with reverse run faction, the FLASH series upgraded 21% as amplifter withreverse in compare with the other of our company and it has achived the world's top class ON-resistance of 0.97m(FET specification). Itprovides a powerful reverse function that does not require much heat protection as well as gereater torque for a forward function.
(Although a reverse run equivalent to forward run is possible, at the time of the use of reverse run for emergency blame, We recommend you to move the throttle leverof transmitter slowly or to carry out stroke adjustment of throttle rigger by the side of transmitter.)• With the three-layered internal board configuration and the high-density mounting of electronic components, the FLASH series
occupies the smallest mounting area without compromising its performance.
• The innovative FET drive method was adopted to improve the efficiency for low to middle acceleration while preventing heatgeneration. (S.R.S. drive [Note 2], VZ type only) (Patent pending)• The MPRS system [note3] which is proven is adapted to a large current circuit. Both super-small body and hight performance havebeen achived.
• All connectors are gold-plated to reduce contact resistance.
[Note 1] SOP: Surface-mount package. It has only a fraction of the weight of a conventional FET.
[Note 2] S.R.S. drive: Synchronous Reverse-voltage Suppression. This is an innovative driving system, which actively eliminates the loss, generated during the pulse drive.
[Note 3] MPRS: Metal Plate Heat Radiation Structure. This is a hybrid structure that feeds a current not only through a copper foil but also through a metal plate on thePC board. It allows the best configuration with the FETs.

CAUTION
The following symbols alert you to important messages. Be sure to read these messages carefully.

WARNINGInstructions to prevent serious injury

CAUTIONInstructions to prevent accidents or product damage

NOTE

Additional information on proper operation

Precautions
1. Ni-Cd battery
WARNING: To prevent fumes, fire, and burns
Improper use of the Ni-Cd battery is very dangerous. The battery must be handled carefully. Incorrect wiring or short-circuitingof the cables may cause fire or fumes. Before connecting or disconnecting the battery to or from the ESC, be sure to turn off
the ESC's power switch. Do not charge the battery while it is connected to the ESC. When the battery is not in use, disconnect
it from the ESC or charger, and store it in a location with no wires or screws.

2. Mounting motor
WARNING: To prevent fumes, fire, burns, and explosion
NEVER attach a Shottky diode to the motor to be used. If a Shottky diode is attached, it may explode or the ESC may bedamaged. To prevent noise, be sure to mount three noise-killer capacitors according to the illustration.

3. Connection of silicone cable and connector
WARNING: To prevent fumes, fire, and burns
Before using the ESC, check if dust has accumulated on the connector terminals (metallic part) of the battery and the motor,and check if the terminals are loose. Poor contact of the connectors may reduce the efficiency and may generate heat resulting
in the deformation or fusion of the resin part.

4. Heat sink (Radiating fin)
WARNING: To prevent fumes, fire, and burns
Electricity flows through the metallic part at the top of the ESC. Therefore, do not allow wiring cables, other metallic parts and the carbon
chassis to make contact with the ESC. When a heat sink is attached, electricity flows through the heat sink. Exercise the same precautions.

5. Proper operation
CAUTION: To prevent accidents and product damage
Do not modify the ESC. Use it only for its intended purpose.
Keep the ESC away from flames or heat. Avoid splashing any liquid, such as water, on the ESC.

Part names and wiring
WARNING: Precautions to prevent smoke, fire, or an explosion
Be extremely careful to observe the correct polarity for the wiring of the battery and Schottky diode. Be sure to install a capacitor
and Schottky diode to the motor. If you do not, the ESC may malfunction.
Connected to the motor

Aluminum shield
Current limiter trimmer(T type only)

the motor after completing
NOTE Connect
the setup shown in the Setup section.

BlueRedMotor
Connected to battery

BlackBatteryRed
Red line of servo

ONPower switch

OFFLED lamp

Braking time
adjustment trimmer
Set switch

High torque servo power line (yellow)■Mounting the capacitors

Rx connector

NOTE Be sure to install acapacitor and Schottky
diode to the motor. If you do not,the ESC may malfunction.

If the servo malfunctions
frequently,
disconnect
theservo's positive wire from theconnector and connect the amplifier's servo power
cord (yellow) directly to the servo. If you do not use
the servo power cord (yellow), secure the cord on
the amplifier case to prevent shorts that may becaused by contact with other metal parts.
High torque servo

Capacitor

Never attach a Shottky diodeReceiver

NOTE to the motor to be used.

MotorReceiver connector
WARNING: Precautions to prevent smoke, fire, or an explosion
Be sure to remove the batteries before modifying the wiring. Be extremely careful that the wires' polarity is correct.
Note that we do not repair servos and receivers.
This type is attached stopper to preventfrom falling out at the connector side(resin part), not connecter pin side(metal part). Pull out the cable while aconvex part of the connector is raisedslightly using needle, cutter or sharp
thing when you pull out the cable.
Insert the cable untill there is asound of crack while turning
the side with connectorpin (metal part) up
when you insert
the cable.

Manufacturerof your receiver
Shape ofconnector insert
port(receiver side)

WiringFormer SANWA, Former KO FUTABA, New KO New SANWA (Z connector), JRThe connector can beused without change.

Avoid reverse
insertion.

Cut
here

Avoid reverse
insertion.

Cut
here

NOTE Be careful of treatment at the time of using a cutter.

This side should be turned up.

SETUP Default Settings
For the default settings, store the neutral point, forward side high point, and reverse (brake) side high point of the transmitter in the amplifier.

NOTE Be sure to set the default settings when you use the amplifier for the first time after buying it or when the transmitter has been replaced.
Do not connect the motor until the set up is completed.

Setup ★Perform each setup procedure within 10 seconds after the LED begins flashing. (This is because the unit is automatically reset after 10 seconds.)
The amplifier may not be normally set depending on the settings of the transmitter. See "Notes about Setup" on the last page.
ON the transmitter switchthat the amplifier switch
ON the amplifier power
1 Check
2 Turn3 Turnand set the following functions
is OFF.
switch.

ONon the throttle side. Return all
the settings for the neutral point,high point, and brake high pointof the transmitter to Normal.

OFFthe SET switch for about
4 Press
five seconds to cause the white
LED to blink.

ONSupplied resin driver
LEDOFFthe transmitter throttle to Brake Point and press
the transmitter throttle to Neutral
the transmitter throttle to High Point and press
5 Put
6 Put
7 Put
the SET switch once (90% from the full brake). Theand press the SET switch once. The
the SET switch once (90% from the full throttle). The
blink speed of the white LED increases.
Neutralblink speed of the white LED decreases.

setup is completed.

90% from the full throttle

90% from the full brake

Setup confirmation ★Check the LED illumination status to confirm whether the ESC is properly set.
The proper setting can be confirmed with the LED. When the ESC is properly set, the LED indicator illuminates at "Neutral", then it
goes off once and illuminates again at "High point" and at "Brake high point (Reverse high point)" as you turn the throttle. Afterchecking that the setup has been completed successfully, connect the motor. The default setup of the amplifier is completed.

Braking time adjustment function★The braking time can be adjusted to control the brake according to the application.

.
NOTE The braking time adjustment (BT) trimmer turns only within the range of 240°
Do not force it past this range.
Braking time adjustment trimmer (0.5~3sec, )The " " mark in the trimmer indicates the set value.
ONE POINT■FLASH T type

■FLASH D type

When moving the transmitter throttle from Forward to Reverse,
brakes are applied to the motor once before it begins the reverse
action to prevent motor breakage due to a sudden reversal. Withthe Braking Time Adjustment Trimmer (BT Trimmer), you can adjust
the amount of time that the brakes are applied before the motor
begins the reverse action within the range of 0.5 to 3 seconds.

Current limiter (T type)

To begin the reverse action immediately irrespective of
the setting time, put the transmitter throttle from
Forward to Reverse to apply brakes, return it to Neutral,and put it to Reverse again.
BACK CANCEL by setting , the braking time before going
into the reverse action becomes infinite and the motor
will never start the reverse action (= no back motion).

★Limiting the maximum current to the motor prevents a skid and improves battery efficiency.

. Do not force it past this range.
NOTE Current limiter (A) trimmer turns only within the range of 240°
The Ni-Cd battery of 7.2 V, 2000 mAh can produce instantaneous maximum current of 200 A;however,when it is used for a touring car, the available current is 20 to 50 A in the normal race run.
Current limiter trimmer (0 to 100%)
The " " mark in the trimmer indicatesthe set value.

Current(A)As illustrated on the right, changing the current limiter value changes

A=100
A=50
A=0the maximum current capacity at full throttle. When the road surface isslippery, lower the limiter value. When you need high torque, raise thevalue. If you set the current limiter value to maximum, the current limiter
function is disabled, allowing maximum torque. If you set the value to0%, current is limited to the minimum value causing some motors torevolve at a slow speed. Set the value according to your needs.

100%(No limitation)
50%

0
NeutralONE POINTCurrentlimiter value

0%High point

Setting current limitations may decrease the rotation speed of the motor.
Set a proper value in consideration of both gas mileage and rotation speed.

Dash power mode (T type only) ★When a car is started, the current limiter can be canceled only with the first throttle operation if you want to make a quick start.
NOTE If any noise interferes with the setting procedure, the ESC may mistake the noise for throttle operationand may not set the dash power mode.

1. Turn the transmitter on and hold down the SET switch for approximately 5 seconds. The LED will flash. (Same as in the setup mode.)
2. Wait until the LED stops flashing. (Approximately 10 seconds) The dash power mode is set.

Battery save mode (S.R.S. drive)(T type only, patent pending)★The battery save mode reduces heat generation and fuel consumption for low- to middle-acceleration
throttle operation. If you can’t get the subtle throttle feel that you want, you can cancel this mode.

Setting Procedure
1. Turn OFF the amplifier power switch and turn ON the transmitter power switch.
2. Turn ON the amplifier power switch while pressing the SET switch of the amplifier.
･Immediately after turning ON the power switch, the LED blinks quickly and then lights up. -> Energy Saving Mode is ON.
･Immediately after turning ON the power switch, the LED lights up. -> Energy Saving Mode is OFF.
*By repeating steps 1 and 2, the Energy Saving Mode turns ON and OFF alternately.
*The ON/OFF state of the Energy Saving Mode is saved after the amplifier is turned OFF.

Mounting heat sink (Radiating fin)
WARNING: To prevent fumes, fire, and burns
Electricity flows through the radiating plates. If you mount a radiating fin, the electricity might flow through it. Do not allow
other cables and metallic parts to make contact with the radiating fin.
★If you run a car under normal conditions, the radiating fin is not necessary. When running a car under a blazing sun or if
you are using a high-torque motor, mounting the radiating fin enables a more stable run. Mount the radiating fin as
described below:
How to Fit a Heat Sink
1. Remove the aluminum top sticker at the top of the amplifier case to expose the metal plate.
2. Use the double-sided tape supplied with the heat sink to fit the heat sink to the metal plate.
*Do not use thick double-sided tape or double-sided tape made of sponge because this weakens the heat radiation effect.

Troubleshooting
Symptom

Cause

Cannot set "High point"
The brake does not function.
The car does not set into reverse.

Motor and servo bothdo not work.

Motor does not work,but servo works.

ESC gets too hot.

RemedyImproper setting of ESC

Reset transmitter throttle setting to normal before setting "High point". Set "High point" position at 90% of full throttle.

Improper transmitter setting

Correct transmitter throttle setting.

Improper setting of ESC

Reset transmitter brake setting to normal before setting "Brake point" (reverse) .
Set "Brake point" (reverse) position at 90% of full throttle.

Improper transmitter setting

Correct transmitter brake setting.

Bad contact with battery

Check that contact with battery is good.

Improper wiring of receiver

Check that wiring of receiver and servo is correct.

Receiver failure

Replace crystal or request repair.

Transmitter failure

Replace crystal or request repair.

ESC failure

Request repair.

Improper setting of ESC

Setup ESC again from the beginning.

Motor failure

Replace motor.

Bad contact with battery

Check that battery and cables are properly connected.

Bad contact with receiver connector

Confirm whether the Rx connector pin is broken or loose.

ESC failure

Request repair.

Insufficient cooling

Attach radiating fin to improve air flow and heat radiation.

Driving load is too high

Adjust driving system.

A diode is attached to the motor. Remove the Shottky diode from the motor.
Acceleration is decreased.

Car behaves incorrectly.

Improper ESC setting

Setup ESC again from the beginning.

Current limiter value is too low

Increase current limiter value.

Failure in motor capacitor

Replace motor capacitor.

Bad position of receiver

Keep receiver as far from battery or ESC as possible.

Transmitter/receiver failure

Request repair.

Incorrect wiring

Make silicone cables as short as possible.

Notes about Setup
Using a transmitter-receiver with a high response system

Using a transmitter that has a throttle rudder adjustment function(*) and maximum brake rate adjustment function (*).

Our amplifier counts the frame rate of output signals from the receiver at the time ofdefault setup in the neutral position and forcefully terminates the settings mode when
the count reaches a given number of times. If you make setting changes in the highresponse system mode, this function may malfunction and severely shorten the time
for setup due to the occurrence of the following phenomenon: The Setup Modefinishes immediately after it starts.
(Solution) If you have an FM or PCM receiver, use the receiver and set the transmitter
to a mode other than the High Response Mode only during the amplifier setup. Aftercompleting the amplifier setup, return the transmitter to the High Response Mode andreplace the receiver with a receiver that supports a high response function.
*If you have only high response receivers, contact the transmitter manufacturer for asolution.

6-cell or 8 cell Ni-Cd or Ni-MH battery
Max. current of Ni-Cd or Ni-MH battery
0.00097 ohm (FET specification)

Power supply
Maximum current
ON resistanceSpecifications

To use a transmitter that has these functions, change the amplifier settings after
setting the throttle rudder angles for forward and reverse traveling to 100% of themaximum rudder position and the maximum brake rate to 100%. Depending on thesettings of the transmitter, the amplifier may not detect signals correctly and theamplifier setup may not be successfully completed due to the occurrence of thefollowing phenomena: Even if you put the throttle to the forward (reverse) side High
Point and press the SET switch, the blink speed of the LED will not change. - After
adjusting the brake (back) side High Point, the LED continues blinking and the setup
cannot be completed.
(*) For details of the functions, see the instruction manual of the transmitter or contact
the transmitter manufacturer.
31.0 (W) x 26.5 (D) x 18.0 (H) mm
24 g (44 g when cable included)
7.2 V (input), 5.8 V (output), 1 A max.

Dimensions
Weight (ESC unit)
Receiver/Servo regulator

Perforated line

Request card for repair

Repair regulations
1. The part that can be repaired is as follows. Internal electronic circuit(Damage caused by incorrect connection or running operation is not covered by the warranty.)
2. Note that repairing the ESC is impossible in the following cases.
When opening the ESC housing.
When using a power supply other than the specified 6-cell or 8-cell Ni-Cd or Ni-MH battery.
When modifying the wiring in order to use a separate power supply.
3. KEYENCE assumes no responsibility for damage of the receiver or servo caused by incorrect connectionof the ESC.
4. Note that if the repair card is not filled out, repair and return of the ESC may be delayed.

Item

FLASH series

Manufactureno.
Costomer's
address
Telephone no.

Please fill in the blanks below.

Date ofpurchase.

.

.

1 year fromthe date of purchaseWarrantytermーTEL

Please describe condition of the ESC as detailed as possible.

2. Your equipment

Warranty
Ultra-small digital speed controller

1. Symptom (Condition)

（）

Name
Note that if the date and location of the FLASH series purchase are not entered on the warranty
card, you will be charged for repairs even within the warranty term.

If a failure should occur within three months of the date of purchasing the ESC,
write the symptoms of the problem and the working condition on a separate sheet.
Request a repair of the ESC from either the distributor where you purchased theESC or from ACUVANCE (Technical Service Department).

Technical Service Dept.
7F, Shin-Osaka Marubiru Annex 1-18-22 Higashinakajima Higashiyodogawa-ku
Osaka 533-0033 Japan. E-mail support@acuvance.co.jp

Description
Motor
Battery

Maker

Model No.

OthersTurn No.

ReceiverTransmitter
Servo
R/C CarVoltage:V

Capacity:

mAh

F-1

Buggy

Touring Car

Drift Car

3. Shop where you bought the ESC
Name:

Address :Tel. No. :0413-2