Leeson M6C17FB10 Faq

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FAQ's - Drives

Adjustable Speed Drives Frequently Asked Questions

The following information is intended to answer commonly asked questions about AC variable

frequency drives (VFDs).

Installation

Installation Questions:

How much space is required around the VFD?

Depending on the VFD series that is being used, maintain the following spacing around each VFD:

Micro Series: 2 inches below 5 HP; 4 inches for 5-25 HP; 6 inches for 25-60 HP; 8 inches above 60

HP.SM Plus Series & SM-Series: 1 inch on each side and 2 inches on the top and bottom for 10 HP

and below; 1inch on each side and 4 inches on the top and bottom for 15-25 HP.

How are enclosures sized if someone wants to mount a drive inside a panel?

Enclosure manufactures typically determine the size of enclosure needed based on entering

some data into a computer program they can access for the purpose. They need to know the ambient

temperature that the drive can operate in (50C for NEMA 1, 40C for NEMA 4/12) and how much heat

is dissipated by the drive. Use the following formula for a guideline only:Watts Dissipated = (HP x

750 x .04) climate space /EFF OF MOTOR. Consult the manual for further information (section 5.0).

Can VFDs be mounted above one another?

It is not recommended to mount VFDs above other VFDs or other heat producing equipment that

would impede the cooling of the VFD, unless sufficient space and additional cooling (fans, blowers, air

conditioners, etc.) are provided.

What precautions must be taken when running the VFD's power conductors and control

wires?

When running the power and control wires, the following guidelines should be followed:

Install the AC input power wiring in its own rigid steel conduit.

Install the output motor leads in their own rigid steel conduit.

Install the control wiring in its own rigid steel conduit. Low voltage DC control wiring and 120

Vac control wiring should be run in separate conduits.

Make sure that all grounds are tightly connected, and properly earth grounded.

NOTE: If multiple VFDs are mounted near each other, the input power wiring for each VFD can be run

in the one conduit, and the control wiring for each VFD can be run in a second conduit, but each set

of motor leads MUST be in a separate conduit. However, if one VFD is used to run multiple motors,

the output wiring for all of the motors can be run in the same conduit.

Is the VFD phase sensitive?

The VFD's input is insensitive to the phase sequence of the input voltage. Therefore, changing the

input phase sequence will not change the rotation of the motor. However, changing the phase

sequence of the VFD's output will change the motor rotation. When applying a VFD, the motor

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Table of Contents

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Questions and answers

Summary of Contents for Leeson M6C17FB10

Page 1 Installation Questions: Model Number How much space is required around the VFD? ex.M6C17FB10 Depending on the VFD series that is being used, maintain the following spacing around each VFD: By Product Characteristics Micro Series: 2 inches below 5 HP; 4 inches for 5-25 HP; 6 inches for 25-60 HP; 8 inches above 60 Select HP.SM Plus Series &...
Page 2 Adding an output reactor or dV/dt filter reduces the spikes. Most LEESON motors are now using IRIS (inverter rated insulation system). Motors with this feature allow longer motor leads (200-300 feet) without the use of an output reactor or filter.
Page 3 What is the voltage imbalance tolerance? The three phase input voltage imbalance must be less than 2% phase to phase. An imbalance of greater than 2% can shorten the life of the VFD and result in severe damage to the VFD’s power components.
Page 4 What happens if the password is changed, and then the new password is forgotten? Contact LEESON for a special password that will allow the operator to enter the programming mode and view the password setting. Will the VFD retain customer parameter settings when there is a loss of input power? Yes.
Page 5 Can a drive be controlled by remotely mounting the keypad? Yes, LEESON has remote keypads for the Micro, SM-Plus & SM Series VFDs as well as their SM Vecotr and SM2 Flux Vector inverters Can a drive be remotely controlled by any other means from longer distances? Yes, most functions can be controlled remotely from the terminal strip with the addition of customer supplied switches, potentiometers speed reference signals etc.
Page 6 Does LEESON VFDs accept single phase input? LEESON does have a line of Micro, SM-Plus, and SM-Series VFDs that will accept either 115 or 230 single phase input power. Please see our catalog for these ratings. In addition, all of our 230 volt VFDs will accept 230 volts single phase on the input side but, you must derate the motor 1/2 the size of the VFD.

This manual is also suitable for:

110088