4
installation
Before Installation
• Stop the fan motor
• Disconnect all electrical power to the fan motor
• Make sure the machine cannot operate during installation by following
proper lock-out tag-out procedures
• Follow all cooling tower safety warnings
• Read and follow all installation instructions
Remove power before opening the cooling tower access door. Stop the
fan motor and disconnect all electrical power before beginning the wiring
operation. It is your responsibility to have a qualified person install and
wire the unit and make sure it conforms with NEC and applicable codes.
The vibration switch is sensitive to shock and vibration in all three planes of
motion – up/down, front/back and side/side.
1. Firmly secure the unit to the equipment using the base foot mount.
2. Mount the enclosure with conduit port located downwards.
3. For retrofit installations, this switch may have a different footprint than an
existing switch. Field drill four holes into the existing mounting plate or me-
chanical beam and mount switch with hardware based on mounting hole
dimensions below. Replacement mounting plate and hardware can also be
purchased through SPX, if desired.
4. Make the necessary electrical connections to the vibration switch. See
Figure 1
for electrical terminal locations and for typical wiring.
Do not
exceed voltage or current ratings of the contacts
. Follow appropriate
electrical codes/methods when making electrical connections. Be sure that
the run of electrical cable is secured to the machine and is well insulated
from electrical shorting. Use of conduit is recommended.
If the electrical cable crosses a pivot point such as at the pivot of the walk-
ing beam, be sure to allow enough slack in the cable so that no stress is
placed on the cable when the beam moves.
If conduit is not used for the entire length of wiring, conduit should be used from
the electrical supply box to a height above ground level that prevents damage
to the exposed cable from the elements, rodents, etc, or as otherwise required
by applicable electrical codes. If conduit is not attached directly to the switch,
use a strain relief bushing and a weatherproof cap on the exposed end of the
conduit. A “drip loop” should be provided in the cable to prevent moisture from
draining down the cable into the conduit should the weatherproof cap fail.
Warning
Note
