6
draw to nameplate amps during cold weather operation. If furnished
with a mechanical O.L. set this at 110% over motor nameplate amps.
• Motor rotation must be the same in both VFD mode and By-pass mode.
• If cable distance between the VFD and motor is greater than 31m a
DV/DT output filter is recommended to avoid damage to the motor.
31m distance is based on our field experience, the VFD manufacture
may state different distances and distance does vary depending on
the VFD manufacture.
• Program the VFD for variable torque output. Flux vector and constant
torque modes may damage the gearbox.
• Do not start and stop the motor using the safety switch at the motor.
If the drive is being commanded to run and the load side is cycled ON
and OFF with the safety switch this may damage the VFD.
Using a VFD in cooling applications has advantages over traditional single
or two speed motor control. A VFD can reduce the cost of electrical energy
being used and provide better temperature control. In addition, it reduces the
mechanical and electrical stress on the motor and mechanical equipment.
Electrical savings can be large during periods of low ambient temperature when
the cooling requirement can be satisfied at reduced speeds. To benefit from
these advantages, it is important that the drive be installed correctly.
Marley supplies VFD and VFD controls specifically designed for our cooling
products. If you have purchased a Marley VFD and/or controls package, please
follow the instructions in the
User Manual
for that system. Most VFD problems
can be avoided by purchasing the Marley drive system. If you are installing a
VFD other than the Marley drive, please refer to that drives installation manual.
Improper use of a VFD may cause damage to equipment or personal
injury. Failure to correctly install the VFD drive will automatically
void all warranties associated with the motor and any equipment
that is either electrically or mechanically (directly) attached to the
VFD drive system. The length of this warranty avoidance will be
contingent on properly installing the VFD system and repairing any
damage that may have occurred during its operation. SPX Cool-
ing Technologies does not assume responsibility for any technical
support or damages for problems associate with non-Marley brand
VFD systems.
Changing the operational fan speed from the factory settings could
cause the fan to operate in an unstable region which may result in
damage to the equipment and possible injury.
Warning
Warning
installation
