Murphy VS94 - Manual
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VS94 Model
■
NEMA 4X/IP66 Enclosure (CSA Types 4 & 12)
■
Protects Your Equipment from Excessive
Shock or Vibration
■
Fine Adjustment to Precisely Select the
Degree of Sensitivity
■
Reset from a Remote Location (Optional)
■
Time Delay to Override Trip Operation
at Start-up (Optional)
■
Space Heater to Prevent Moisture
Condensation Inside the Unit (Optional)
Description
VS94 Series is an electro-mechanical device
designed to protect equipment from damag-
ing shock or vibration. This sensitive mech-
anism can detect excessive shock or vibra-
tion and shutdown the equipment before fur-
ther damage occurs. A set of contacts is held
in a latched position through a magnetic
latch mechanism. As the level of shock or
vibration increases an inertia mass exerts
force against the latch arm and forces it
away from the magnetic latch causing the
latch arm to separate and to operate the con-
tacts. Sensitivity is obtained by adjusting the
amount of air gap between the magnet and
latch arm plate.
The VS94 Series is housed in a NEMA 4/4X
glass filled polyester enclosure and has a
base mount. It is for applications in non-haz-
ardous locations.
VS94 models are rated up to 480 VAC.
(See the How to Order section on back page
for models and options available.)
Applications
Applications for the VS94 include all sta-
tionary types of machinery or equipment
where excessive shock/vibration can be
damaging or poses a threat to normal opera-
tions such as in:
■
Cooling fans
■
Engines
■
Pump jacks
■
Compressors
■
Pumps
■
Rotating and Reciprocating Machinery
Features
■
Electromechanical Design
■
Detects Shock or Vibration in
Three Planes of Motion
■
NEMA 4/4X (CSA types 4 and 12)
Weather-proof Enclosure
■
Reliable Magnetic Latch Feature
■
Micro Fine, Easy-to-Adjust
Sensitivity Adjustment
■
Manual Reset (Standard)
■
Remote Reset (Optional)
■
Adjustable Start-up Time Delay (Optional)
■
Space Heater Circuit to Prevent Housing
Moisture Condensation (Optional)
■
Two (2) versatile SPDT snap-switches
rated up to 480 VAC.
Options
Remote Reset
This option of the VS94 includes a built-in
electric solenoid which allows reset of
tripped unit from a remote location.
Available for 115 VAC or 24 VDC.
Time Delay
Overrides trip operation on start-up.
The time delay option is field-adjustable
from 5 seconds up to 6-1/2 minutes with an
easy-to-adjust 20-turn potentiometer.
Available for 115 VAC or 24 VDC.
Space Heater
This optional circuit prevents moisture con-
densation inside the VS94 housing.
VS94 Model
VS-94092B
Revised 03-03
Catalog Section 20
(00-02-0077)
Shock and Vibration Control Switch
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