REYMSA COOLING TOWERS, INC.
www.reymsa.com
The
All-Fiberglass
Cooling Towers
21
A.2.8.2. VIBRATION SWITCH
Vibration switches provided by REYMSA are shock sensitive mechanisms for shutdown of the Closed Circuit
Fluid Cooler fan motors. These switches use a magnetic latch to ensure reliable operation whenever shutdown
protection from damaging shock/vibration is desired. As the level of vibration or shock increases an inertia
mass exerts force against the latch arm and forces it away from the magnetic latch causing the latch arm
to operate the contacts. Sensitivity is obtained by adjusting the amount of the air gap between the magnet
and the latch arm plate.
Stop fan motor and disconnect all electrical power, tag and lock in off position
before beginning installation.
Failure to do so may result in personal injury or property damage.
CAUTION
Note: During severe cold weather conditions, ice can form on the fan blades of Closed Circuit Fluid Cooler
causing excessive vibration. The vibration switch shuts down the motor avoiding potential damage by shock
or vibration.
Installation instructions
Firmly secure the unit to the equipment using the base foot and mount to a satisfactory location, see Figure
A-44 as an example of a recommended location. The vibration switch is factory mounted (if bought with
the Closed Circuit Fluid Cooler); wiring to the control panel needs to be done in the planned location of the
Closed Circuit Fluid Cooler.
VIBRATION SWITCH
Figure A-44: Vibration switch recommended location
Make the necessary electrical connections to the vibration switch. See Figure A-45 for electrical terminal
locations and Figure A-46 for a typical electrical diagram. See section “C.1.2 CONFIGURATION AND
START-UP FOR ABB ACH550-UH” for vibration switch connections on VFD.
SPDT SWITCH
TERMINALS
NO1 NC COM NO2
SENSITIVITY
ADJUSTMENT
N01 NC COM
N02
CONTACT RATING
5A @480 VAC
Figure A-45: Internal switches Figure A-46: Typical electric diagram
Installation
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