17
Section 3
Installation
Proper operation and long life of the eddy-current unit
depend on its installation, location and environment.
These instructions are intended as a guide for safe and
proper installation, but do not cover all possible situations
that may arise. Refer any questions to DSI/Dynamatic 1-
800/548-2169.
Location and Environment
The clutch is an open, drip-proof, self-ventilated unit that
should be installed in an area suitable to its design. An
adequate supply of clean, dry cooling air is required.
Locate the unit away from any obstruction, usually at least
twelve inches from a wall, to permit free air movement and
accessibility for routine maintenance and inspection. Do
not obstruct ventilating openings or mount the unit within
the base of a machine without making provisions for
adequate inlet and outlet of cooling air.
These units are designed to operate under standard
service conditions unless purchased for certain specific
environmental conditions. Standard service conditions
are listed in Table 3-1. If purchased for special
environmental conditions, consult the contract papers for
the unit.
conditions by the local code inspection and enforcement
agencies.
Site Preparation
Before installation, make sure the jobsite is free of debris
and all heavy construction, especially overhead. Provide
protection for all personnel and equipment in the area, as
required by the conditions. Clean up construction dust,
dirt and scrap material so they are not pulled into the unit
by cooling fan suction.
When planning the installation, be sure to include access
for maintenance, the correct size, number and location of
conduits, and adequate electrical service for the
equipment. Remember, the location should provide
adequate space for the removal of the unit or a component
of it.
Mounting surfaces must be machined flat and level to
support all feet evenly and be rigid enough to prevent
flexing or resonance. As a rule, the base plate should be
at least as thick as the mounting feet or flange. Do not set
the unit directly on a wood or concrete floor. Consult the
factory for weight and center of gravity data.
Standard Service Conditions
Table 3-1
The unit must be mounted with its shaft in a horizontal
position unless it is a vertical model that is specifically
designed for vertical mounting and operation. Other
models must be mounted horizontally unless certified
drawings or other documentation, furnished for equipment
supplied for a specific customer order, indicates that the
equipment is designed for vertical mounting and
operation.
Operation in ambient above 104ºF (40ºC) requires the HP
dissipation to be de-rated 10% for each 10ºF (5.5ºC)
interval to a maximum ambient of 148ºF (65ºC). For
operation above 3300 feet (1000 meters), it is necessary
to de-rate the HP dissipation 5% for each 1100-foot (330
meter) interval to an altitude of 10,000 feet (3000 meters).
Alternative altitude and ambient temperature ratings can
also be calculated by decreasing the maximum ambient
temperature rating by 4.6ºF per 1000 feet (8.33ºC per
1000 meters) above 3300 feet (1000 meters).
The unit should never be placed in any hazardous
location restricted by the National Electrical Code, Article
500, unless it is specifically designed for a specific
hazardous service and it is approved for such service
2. Use a light to check inside openings for foreign
material.
Unit Preparation
Move the unit to the jobsite using proper handling
procedures. Refer to Section 1, "Handling," for more
information. If the unit has been stored in a cool location,
allow it to reach room temperature before removing
packing material. Then remove all temporary screens,
cover plates, tie down bolts and banding. Before
proceeding, review the application requirements and
check the unit nameplate to be sure the correct unit is
being installed and electrical service is correct.
Examine the unit for damage or lost accessories. The
following check should be made before installation:
1. Turn shafts by hand and observe any binding, rubbing
or noise that may indicate damage to bearings or
other components.
3. Open junction box covers and check continuity and
leakage to ground.
Altitude
not exceeding 3300 ft.
(1000 meters)
Ambient Temperature 32ºF to 104ºF (0ºC to 40ºC)
Coil Voltage
not exceeding 10% over
nameplate rating
Environment
clear of dust, dirt, high
moisture and vapors
Line Voltage Variation +/- 10% of nameplate rating
CAUTION
: Beware of re-circulation of cooling air. Hot
air discharge must not be allowed to re-enter the unit
or any adjacent air-cooled unit.
CAUTION
: Electric welding equipment must be solidly
earth grounded. Do not use clutch or motor as a
current path. Serious bearing and insulation damage
may result.