Specification Sheet

2−8 Installation & Operation MN408
Coupled Start Up This procedure assumes a coupled start up. Also, that the first time start up procedure was successful.
1. Check the coupling and ensure that all guards and protective devices are installed.
2. Check that the coupling is properly aligned and not binding.
3. The first coupled start up should be with no load. Apply power and verify that the load is not
transmitting excessive vibration back to the motor though the coupling or the foundation. Vibration
should be at an acceptable level.
4. Run for approximately 1 hour with the driven equipment in an unloaded condition.
The equipment can now be loaded and operated within specified limits. Do not exceed the name plate
ratings for amperes for steady continuous loads.
Jogging and Repeated Starts
Repeated starts and/or jogs of induction motors generally reduce the life of the motor
winding insulation. A much greater amount of heat is produced by each acceleration or jog than by the
same motor under full load. If it is necessary to repeatedly start or jog the motor, it is advisable to check
the application with your local Baldor distributor or Baldor Service Center.
Heating - Duty rating and maximum ambient temperature are stated on the motor name plate.
Do not exceed these values. If there is any question regarding safe operation, contact your local Baldor
distributor or Baldor Service Center.
Hazardous Locations
Hazardous locations are those where there is a risk of ignition or explosion due to the presence of
combustible gases, vapors, dust, fibers or flyings.
Selection Facilities requiring special equipment for hazardous locations are typically classified in accordance with
local requirements. In the US market, guidance is provided by the National Electric Code. In
international hazardous location areas, guidance for gas / vapor / mist classification is given in
IEC60079−14, or for dust in IEC61241−14. This classification process lets the installer know what
equipment is suitable for installation in that environment, and identifies what the maximum safe
temperature or temperature class is required. It is the customer or users responsibility to determine the
area classification and select proper equipment.
Areas are classified with respect to risk and exposure to the hazard. In the US market, areas are
typically classified as follows Class, Division, Group and Temperature Class. In some newer installations
in the US and in most international markets, areas are classified in Zones.
Protection Concepts
Class I Division 1 / Zone 1 [Equipment Group I (mining) or II (surface), Equipment Protection Level
(EPL) Gb, Mb ]
Baldor offers a range of motors suitable for installation in a Division 1 or Zone 1 environment. These
motors are known as explosion proof or flameproof.
Motors that are explosion proof or flameproof use specially machined flameproof joints between the end
bell or bracket and the frame, as well as along the rotating shaft and at connection box covers and
entries. The fit of these flameproof joints are designed to contain the combustion or quench the flame of
an explosive gas atmosphere prior to it exiting the motor. These flameproof joints have lengths and
widths selected and tested based on the gas group present in the atmosphere. BaldorSReliance motors
are typically designed to meet Class I (Division 1) Group C and D (explosion proof) or Ex d IIB
(flameproof).
An application note regarding equipment applied in accordance with the US National Electric Code (NFPA
70−2008) − according to Article 500.8(C) Marking, sub clause (2) in the fine print note, it is noted that
Equipment not marked to indicate a division is suitable for both Division 1 and Division 2 locations. These
motors are not gas tight. To the contrary, this protection concept assumes that due to the normal heating
and cooling cycle of motor operation that any gas present will be drawn into the motor. Since flameproof
or explosion proof motors are designed to contain the combustion and extinguish any flame transmission,
for this protection concept, only external surface temperatures are of concern. Thermal limiting devices
such as thermostats, thermistors or RTDs may be provided on these motors to limit the external surface
temperature during overload conditions.
If thermostats are provided as a condition of certification, it is the installer’s responsibility to make sure
that these devices are properly connected to a suitable switching device. The ATEX directive requires
that motor shutdown on thermal trip be accomplished without an intermediate software command. Where
intermediate circuitry is involved the circuit shall fall within the scope of a safety, controlling and regulating
device as defined in article 1(2) of European Directive 94/9/EC, and shall be covered by an appropriate
EC Type Examination Certificate.