FW Murphy VS2 Series Installation Manual

Installation of Shock/Vibration Control Switches
Model Series:
VS2
Please read the following instructions and warnings before installation. Visually inspect the product for any damage that may have
occurred during shipping.
Before beginning installation of this product:
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Warnings
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The FW Murphy shock and vibration switches are available in a variety of models.
They are used for applications on machinery or equipment where excessive vibration
or shock can damage the equipment or otherwise pose a threat to proper operation.
A set of contacts is held in a latched position through a mechanical latch and magnet
mechanism. As the level of vibration or shock increases, inertia forces act against the
latch arm and force it away from the magnetic latch. This action causes the latch arm to
operate the contacts. Sensitivity is obtained by adjusting the size of the air gap between
the magnet and the target or bolt head on the adjusting mechanism. Applications
include all types of rotating or reciprocating machinery such as cooling fans, engines,
pumps, compressor, and pump jacks, etc.

Models and Options

• VS2: Base mount; suitable for non-hazardous locations
or as simple apparatus connected to a certified
non-incendive or intrinsically safe electrical digital
input. Meets IP54 specifications when mounted on a
horizontal surface with the drain holes down.
• VS2C: VS2 with C-clamp mount installed on switch.
• VS2EX: Explosion-proof; meets IP54 specifications;
Class I, Div. 1, Groups C and D hazardous locations;
CSA for Canada and US.
• VS2EXR: Explosion-proof with remote reset (CSA
approved).
• VS2EXRB: Explosion-proof; Class1, Div.1, Group
B: with remote reset (no third-party approval for this
product). No IP rating for this product.
• VS94: Base mount; non-hazardous locations, NEMA
4X/IP66.
Optional Remote Reset Feature (VS2EXR, VS2EXRB and
VS94)
An optional remote reset includes built-in electric solenoids
which allows reset of tripped unit from a remote location, or
hold-in reset during starting. Options are listed below:
• R15: Remote reset for 115 VAC
• R24: Remote reset for 24 VDC
VS94 Time Delay Option
Overrides trip operation on startup. For VS94 series models,
the delay time is field adjustable from 5 seconds up to 100
seconds with a 20-turn potentiometer (5 seconds per turn
approximately). Options listed below:
• T15: Time Delay for 115 VAC
• T24: Time Delay for 24 VDC
VS94 Space Heater Option
This optional space heater board prevents moisture from
condensing inside the VS94 Series case. Options listed below:
• H15: Space Heater for 115 VAC
• H24: Space Heater for 24 VDC
, VS2C, VS2EX, VS2EXR, VS2EXRB and VS94
™
Disconnect all electrical power to the machine
Make sure the machine cannot operate during installation
Follow all safety warnings of the machine manufacturer
Read and follow all installation instructions
It is your responsibility to ensure that qualified mechanical and electrical technicians install this product
Please contact FW Murphy immediately if you have any questions
Service Parts
Part Number Description
20000031 Glass and gasket assembly
20000032 Reset push button assembly
20000261 Cable clamp assembly (1 each) (VS2C)
20000288 Snap-switch and insulator kit (one
switch per kit)
20000289 C-clamp conversion mounting kit
25050506 Dust boot

Specifications

VS2 and VS2C
Case: Environmental Protection: Ingress protected to IP54 (when mount-
ed on a horizontal surface with drain holes down)
VS2: Base Mount
VS2C: C-Clamp mount. Includes 45' (13.7M), 2-conductor 16 AWG, 30
strands/0.25mm strand diameter (1.5mm2) cable and five cable hold-
down clamps
Contacts: SPDT double make leaf contacts, 3A @ 240 VAC, 10A @ 120
VAC; 10A @ 32 VDC
Operating Temperature Range: -40
Range adjustment: 0-7 G's; 0-100 Hz/0.10 in. displacement
VS2EX
Case: Base mount, explosion-proof aluminum alloy housing; meets IP54
specifications; Class I, Division1, Groups C&D
Certification: CSA Canada and US
Snap switches: 2-SPDT snap-switches; 5A @ 480 VAC; 2A resistive,
1A inductive, up to 30 VDC
Operating Temperature Range: -40
Range adjustment: 0-7 G's; 0-100 Hz/0.10 in. displacement
sect. 20
00-02-0185
rev. 2020/05/11
o F to 185 o F (-40 o C to 85 o C)
o F to 185 o F (-40 o C to 85 o C)