VB

4

Safety Precautions

Refer to Safety Precautions for All Limit Switches.

Connection

• Be sure to connect a fuse with a breaking current 1.5 to 2 times

larger than the rated current to the Switch in series in order to

protect the Switch from damage due to short-circuiting.

• If the VB is used for EN ratings, use a gI or gG 10-A fuse approved

by IEC269.

Operation

Make sure the notch of the plunger is not pressed into the scraper

when operating the VB Multiple Limit Switch, otherwise chips or dust

may penetrate into the VB Multiple Limit Switch.

Sealing

• The switch box and cover are made of die-cast aluminum and the

mounting part of the Switch is covered with a seal cap, and ensure

a sealing performance of more than 98

Limit Switch.

The filter on the side of the head prevents oil and water from

penetrating into the interior of the VB Multiple Limit Switch while

preventing the internal pressure of the VB Multiple Limit Switch

from rising when the plunger is pressed.

The seal scraper on the tip of the actuator prevents chips and dust

from penetrating into the moving parts of the VB Multiple Limit

Switch.

• Apply extra tightening to the cap screw on the conduit.

• In order to protect the plunger from abrasion and prolong its

service life, apply a small amount of grease to the plunger and dog

or cam that come into contact with the plunger. (Molybdenum

disulfide grease is recommended.)

Appropriate Tightening Torque

1. Tighten each cover mounting screw to a torque of 1.18 to

1.37 N·m.

2. Tighten each switch terminal screw to a torque of 0.19 to 0.29 N·m

if the mounting screw is M3 in size.

Be sure to wire each solderless terminal correctly with a screw as

shown below.

3. Apply a torque of 5.88 to 6.86 N·m to tighten each mounting bolt

of the casing if the mounting bolt is an Allen-head bolt that is M6 in

size. Apply a torque of 8.04 to 9.22 N·m instead if the mounting bolt

is an Allen-head bolt that is M8 in size.

Mounting Holes

Wiring

Switch through the M3 round solderless terminals with insulation

covers.

Dimensions of Round Solderless Terminal

Wiring (Ground Terminal Models)

Consult your OMRON representative for details on models with 3 to 6

plungers.

Others

• Carefully connect a conduit to each conduit hole and apply a seal

or tape to seal the conduit hole so that cuttings or other materials

will not penetrate through the conduit hole.

• Use the SC Connector. Consult your OMRON representative for

details on SC Connectors.

• Make sure that the position of the actuator that is traveling does not

exceed the overtravel (OT) position. Make sure that the operating

stroke is 70% to 100% of the specified OT distance.

Precautions for Safe Use

Operating plunger

Movable plunger

Seal scraper

Cap

Seal cap

Switch box

Cover

Seal gasket

O ring

Cap screw

Standard switch

Solderless terminal

Terminal screw

Correct

Incorrect

With a Flange Switch Box

Four, 6.5-dia. or M6

mounting holes

Two, 8.5-dia. or M8

mounting holes

Two, 6 dia.

0.15

protruding positions

Without a Flange Switch Box

Two, 8.5-dia. or M8

mounting holes

D dia.

dia.

L

l

F

B

dz dia.: 3.2

D dia.: 1.9

B:

5.2

L:

16.4

F:

5.8

l:

8.0 (mm)

Ground terminal

SC connector

Built-in switch

VB