VFD
VFD Square Reduction V/F Pattern
The square reduction V/F pattern is ideal for loads such as fans and pumps. It provides non-linear acceleration and deceleration patterns to sustain torque throughout the whole frequency range. Depending on which drive you are using the parameter for ...
S100 Brake Control
Brake control is used to control the On/Off operation of electronic brake load system. Brake release sequence: During motor stop state, if an operation command is entered, the inverter accelerates up to brake release frequency (Ad.44– 45) in ...
Navigating An IPO Fault
An IPO fault occurs when a 3-phase inverter input has one or more phases in an open circuit condition. To fix this bit 2 of Pr.05 must be set to 1.
H100 Fire Mode Operation Update
The fire mode function is used to allow the inverter to ignore minor faults during emergency situations, such as a fire, and provides continuous operation to protect other systems such as ventilating fans. While in fire mode, the inverter continues ...
Setting Up Motor Parameters From Nameplate
Below are instructions for setting up the motor nameplate parameters for each of the LS Electric VFDs currently available. H100+ S100 G100 M100
H100+ Multi-Pump Function
The H100+ is capable of multiple pumps at once, This can be done through the AP1 menu and a few parameter changes. See the video below for a hands-on demonstration
"Check Line Plz" error on VFD keypad
If there is a connection or communication issue between the control board and the LCD keypad you may get a "Check Line Plz" message. No parameters or modes are allowed to be accessed. In this situation you should... First, check the cable on the ...
S100 IP66 Fan Warning
Problem Description A parameter in the drive is set to IP20, but it should be set to IP66. The drive cannot recognize the correct fan configuration with the incorrect setting. Detecting the Problem If the S100 is displaying the below code on the ...
Low output voltage on iS7
There may be a few parameter settings that can result in a low output voltage. First off, verify the motor voltage is set correctly at BAS15. By default the iS7 VFD will reduce output voltage Check the auto torque boost (ATB) setting at parameter ...
SP100 Bypass Schematic
Utilize the attached SP100 Bypass schematic for troubleshooting the various components in the SP100 bypass panel.
Where can I find the part # for a VFD PCB?
Typically part #s for printed circuit boards (PCBs) on LS VFDs starts with a "101". There is often more than one part # lists on the PCB, but this one is the most useful for identifying the board. See below example. For any questions on repair, ...
Flashing firmware on the VFD is failing
Sometimes a firmware flash may stall and fail during the process. If this occurs, it can usually be corrected by running the SmartCopier with the AC adapter instead of batteries only.
"Diff Code Type" Error Message
A "Diff Code Type" error message may pop up when trying to copy parameters from the LCD keypad (loader) into the VFD. The error means that the parameter backup was read from a VFD with different firmware than the VFD we are trying to write to. ...
LS Electric America Service Centers
LS Electric America works with a number of authorized service partners (ASP) across North America. These ASP's are thoroughly vetted and trained to understand how to effectively analyze and repair product issues all of the way down to a board level. ...
HOLD, IOT, and ErrC Trip on an S100
HOLD, IOT, and ErrC trips are all very similar. They involve the communication and connection between the IO PCB and the Control PCB. When there is a communication error between these two boards the trip will occur. Troubleshooting The first and ...
Getting an OVT on startup
Tripping on overvoltage (OVT) on start can be a sign of a short in the motor. Follow the below checks to find the root cause. Accel and Decel times are set properly for the application. Extended these out if possible V/F pattern is setup correctly ...
I have high voltage on the output my VFD.
When reading the output of a VFD with a multi-meter you may see high readings. For example, a 460VAC output may read well over 500VAC (sometimes up to 1000VAC). This is normal, due to the VFDs output being a PWM waveform. Most multi-meters are "RMS" ...
Motor is running very hot
If the motor in a given application seems to be running hotter than usual its recommended to run through the below flowchart to find the root cause.
Motor stalling while accelerating
If an application has an issue starting a motor of if the motor is "stalling" it is recommended to follow the below flowchart for troubleshooting.
Troubleshooting an Overcurrent Trip (OCT)
An Overcurrent trip (OCT) occurs when the output of the inverter detects an amperage of 200% of the VFDs rating. For example, let's say a VFDs output rating is 10 Amps. If the output jumps up to 20 Amps, the VFD will trip instantaneously on "OCT" to ...
Troubleshooting a low voltage trip (LVT)
A low voltage trip occurs when the DC bus voltage drops below the trip point. It is important to note that the VFD does not directly measure input voltage. The VFD measures DC bus voltage. In turn, if DC bus voltage drops, it can be assumed that the ...
Troubleshooting an Over-voltage Trip (OVT)
Over-voltage trips (OVT) occurs when the DC bus exceeds the maximum allowable level. OVT can be caused by a number of conditions. It is recommended to use the below flowchart to help pinpoint the root cause. 200V Class trip point = 400VDC 480V ...
Low voltage trip (LVT) occurs but input voltage is normal.
Compare the values of the VFDs measured DC Link Voltage and the measured DC Link Voltage. Measure actual on P and N terminals with a multimeter. The VFDs measured DC voltage is displayed at different locations depending on the VFD series. Refer to ...
My VFD running PID is stuck at 60Hz
This condition can have multiple causes. If the VFD seems to be stuck at 60Hz, start by going through the below items to check. What is the digital input status? Use monitor IN90 Make sure the VFD is not in a "PID Open loop mode". This takes the VFD ...
Missing "DLL File" error message while installing DriveView9
If you install DriveView9 and receive an error message stating "missing DLL file", this means you need to install the latest Microsoft Visual C++ Redistributable files. The attached DriveView 9 manual explains this on page 6. You can find the latest ...