Question about Inverter Yaskawa F7 Drive

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Dear Expert, We recently commissioned an elevator by using a Yaskawa L7 spec B type drive with out having speed feed back. The traction motor is rated for 5.0 Kw ; 400 v , 3 phase ; 50 Hz. Motor connection is star. The capacity of the drive unit used is 7.5 Kw. We have noticed that there is a vibration felt in lift cabin while it is moving.The vibration is felt in both up &down direction at start, at constant speed, at deceleration & finally at creeping phase. Guide shoes mounted in the cabin are completely free & no excess gliding friction on both direction. All guide rails are well cleaned & lubricated. Therefore, it is seem to be there is no mechanical problem & suspect that may have that could be with the problem with lack of adjustments. Also we have noticed that above vibration is gradually being now increased by day to day along with the usage. Therefore, I would like to have your expert advise to overcome the above problem with out causing a further damage of the drive unit if may have effected. I greatly appreciate you if you could advise us on the above as soon as possible. Thanks. Best Regards, Ravi Wickramasinghe

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Posted on Jan 02, 2017

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SOURCE: always showing alarm EOC,EOP

The system that you described is a closed-loop system. The inverter tells the motor what to do and the encoder send information back to the inverter to verify the operations.

With out knowing part# and serial number of the unit in question, I do not know exactly which inverter you are having problems with.

With E.OC error, there is a lot of current demand on the inverter. This could mean a short in the motor, motor leads, connections or inside of the inverter. This could also be caused by the encoder feedback loop being defective. If the inverter tells the motor to run at 1000rpm and the feedback tells the inverter it is only running at 5rpm, the inverter will send out more current to get the motor up to speed.

Since you are getting multiple errors, there could be other internal problems with the inverter especially if the unit is old and contaminated internally.

Posted on Jun 03, 2015


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OS or O5 Error on Landice L-Series Treadmills

Probable Cause

An OS or O5 error on the Landice L-Series treadmills, such as the L7, L8 and L9, indicates an over speed condition and this occurs when the actual speed of the running belt is faster than the set speed. The possible causes for an overspeed, OS or O5, error are: A) User weight is over 200lbs, treadmill elevation is set between 10% and 15% grade and speed is set between .5 mph and 3 mph
B) User is pushing against treadmill belt causing it to go faster than the set speed
C) Defective lower board or misaligned speed sensor
D) Maladjusted speed potentiometer

Corrective Action

A) Gravitational force will enable the user's weight to move the treadbelt faster than the set speed. The speed sensor will pick up this increase in flywheel speed and sends this information up to the display electronics. The microprocessor will then compare the actual speed to the displayed speed, determine a runaway speed condition and shut the treadmill down. An overspeed will display in the window. This is a safety feature built into all treadmills that utilize closed loop speed circuitry. The way to address an over speed condition due to gravity is have the user decrease elevation below 10% or increase the speed.

B) Similar to the gravitational force, a user can be holding onto the handrails and pushing the running belt in such a manner where they are using the treadmill like a manual machine rather than a motorized one. User needs to set speed compatible for their actual walking or jogging speed so they are not pushing the belt.

C) It's possible a blown motor control board is the problem. This occurs more frequently with PWM drives than SCR drives. However, this problem is becoming rare due to the PWM circuitry which senses this condition and shuts itself down before the drive motor receives any DC voltage at all. This means you'll get an LS or L5 error if your PWM is blown, not an OS or O5 error. This is a safety feature on all Landice home treadmills with PWM motor control boards. The SCR motor control boards also have internal protection to prevent an over speed condition from occuring due to an internal component failure. In the rarest of cases, on home treadmills, a faulty relay board can cause an OS or O5. To verify this, using a digital voltmeter, with treadmill turned on, measure the DC voltage between the V+ and P1 on the PWM board. The reading should be between 6-7 VDC. Also measure the DC voltage between P1 and P2 on the PWM board. The reading should be between 0.5 VDC and 6-7 VDC. If either of these voltages measure zero, replace the relay board.

D) Get into Open Loop Speed mode and check the speed. Adjust pots as necessary to bring up correct speed for max and min.

on Apr 10, 2015 | Landice Exercise & Fitness

2 Answers

I have a 2002 Jaguar S type a few weeks back I started my car and tried to drive when the traction control light blinked and the car loss power until I turned the traction control off, had the codes read...

That's easy
Don't go back to that shop, as they failed to
diagnose the real issues
Try a different shop & explain everything in
detail, so no more parts are installed based
on a code
You need factory manuals to follow the proper charts,
to test vehicle systems.
There is no way both front wheel speed sensors
failed at the same time, plus the abs motor
One of the 3 maybe,all 3 no way
Someone was guessing at your expensive

Jul 20, 2013 | Cars & Trucks

1 Answer

I have a Horizon QuantumCS 11 HRC Pacer Treadmill and I am getting E7 flashing when turned on,belt moves for seconds and then stops

please follow the steps and fix it. God bless you

E7- 1) Alternative Elevation Motor

1)Cause: Elevation Motor not moving Solution:Check Elevation Motor connection

2)Cause: Elevation Elevation Motor screw binding Solution: Clean screw and lubricate

3)Cause: Elevation Motor Motor out of Range Solution: Check motor out of elevation

4)Cause: E-Motor Potentiometer: Solution: Replace Elevation Motor


Display Doesn't Light Up: a)Cause: On/Off switch Solution: Test unit is turned on b)Cause: Insufficient Power Source Solution: Plug dedicated120V, 20Amp Outlet

c) Cause: Line Cord Damaged Solution: Replace Line Cord

d)Cause: Fuse Solution: Check Fuse on MCB


Nov 15, 2012 | Exercise & Fitness

1 Answer

Wiring Diagram

I think you would probably find what you are looking for by going to the manufacturer web site :

There is no way that anyone here can find what you are looking for. Incremental encoders are used for anything from robotic assemblers to elevators - unless you provide a lot more information about what it is you are wanting a wiring diagram for, there is no way anyone is going to be able to help you.

Apr 06, 2012 | Cars & Trucks

1 Answer

Landice L7 ce error code

Dear Sir:

This condition indicate problem with the elevation motor.

You must Run the software calibration, for easy diagnose and troubleshooting, see your user manual

Try to clean and lubricante the elevation motor, gear and the shaft of motor.

sincerely.God bless you.

ernesto cuadra
managua, nicaragua.

Mar 05, 2012 | Exercise & Fitness

2 Answers

Hi,I have a Jazzy that is running very slow all of a sudden. When the seat is at it fully down position the chair will not drive at all, when the seat has been raised a couple of inches it starts to move...


It sounds like you are describing the seat elevator on the 1120/2000. Depending on the type of electronics ( Penny and Giles or Dynamic) and the type of toggle (through the joystick or a separate toggle switch), there a number of explanations.
The electronics are designed to inhibit or slow down the speed of the chair 1/4 or 1/2 based on the position of the elevator with regard to the magnetic reed switch sensor on the elevate post. If the elevator is slightly raised the magnetic switch opens or closes. This inhibit is designed to slow down the chair for safety when it is elevated.
You may have a bad inhibit harness, bad sensor, poorly adjusted sensor, etc. The sensor and wiring is easy to check and adjust. The way I diagnose this problem is to bypass the inhibit harness to test at full speed and work my way back to the faulty component.
You can do the magnetic reed switch adjustment yourself with a small screwdriver. Move the magnet and sensor on the elevate post until it works. This is a trial and error type of adjustment. The sensor and magnet should move close enough to activate the switch sensor without hitting.
The fact that the chair does not work at all in the down position probably means the harness is getting pinched or is bad, A continuity check is the best way to verify this.
By the way ,the easiest way to do all this checking is by pulling the seating system and removing the cover of the base. A common household magnet is handy to have for testing.
Hope this helps.

Feb 07, 2011 | Pride Mobility Products Used Jazzy...

1 Answer

My Tunturi Treadmill ramp is stuck in the top elevation position and will not run. I get a "Auto Syncing" message, but the machine will not run. Have tried unplugging etc, but it will not exit the mode...

Enter the testing mode after switching the treadmill POWER ON by pushing first ‘SELECT’ and then ‘SPEED DOWN’ and hold buttons pressed simultaneously.
LED scanning mode for verifying display functionality Press ‘ENTER’ to scan DATA LINES to verify display functionality Press ‘ENTER’ to scan SACN LINES to verify display functionality Press ‘ENTER’ to scan LED’s to verify display functionality After pressing ‘ENTER’ the TIME window shows “test” and the keypad functionality can be tested (the value displayed changes when a button is being pressed) Press ‘ENTER’ to enter IO mode (TIME display shows lift motor potentiometer value, SPEED reads speed from speed sensor and DISTANCE shows heart rate pulse) Press ‘START’ to test lower board relay (a “click” sound) and then press ‘ELEVATION UP’ for 2 seconds to increase the elevation to 8%. Press ‘ELEVATION DOWN’ to decrease the elevation to minimum percentage 0% Press ‘SPEED UP’ to increase speed value and ‘SPEED DOWN’ toto decrease speed value. Press ‘ENTER’ to repeat above test or ‘SELECT’ and ‘ SPEED DOWN’ buttons simultaneously to return to the normal mode
The lift motor calibration is done manually by following the following steps: 1. Drive the lift motor to 0% from user interface (inclination display must be 0%) 2. Switch off the treadmill and unplug the power cable 3. Remove motor cover 4. Fold up the running deck 5. Loosen two screws (A) attaching the lift motor nut (B) to the incline frame 6. Adjust the lift motor nut (B) so that there is 9 mm (.358 in ) gap between the upper end of the nut and the lift motor frame Tighten the screws (A) and verify correct elevation by measuring Adjusting lift motor to 0% position 2.76in 12% position 9.646 in measurement taken from floor to bottom of motor compartment frame.

Jun 11, 2010 | Tunturi T30 Programmable Treadmill

1 Answer

Poor handling

hi turn off your traction control so traction light comes on, then give it some revs and wheel spin it. then turn traction control on so the light is off and do the same if the wheeks spin your tractions shot if they dont tractions ok ,your tyres are rubbish,, and as they are your only contact with the road you shouldt skimp,if money is tight buy good quality part worns ihave 265/30 19 on my rear and they still want to let go in the rain when i push her,

Jul 09, 2008 | 2001 BMW 325

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