Azbil VDC - Page 9

Azbil Corporation Safety Guide
Model MTG11A/18A, MTG11B/18B, MTG14C vii
4-3 : Pneumatic piping and electric work
CATUTION
• Pneumatic tubing should be sized so as not to
cause dropping of air pressure when the control
valve is in operation. Pneumatic tubing should
have an allowance in bend (use specialized
tool) and the parallel tubing should be clamped
together.
• Only qualied persons should do electrical
work in accordance to electrical facility
engineering standards.
• Cable connections should be made to conform
to the facility's conditions. A suitable adaptor
or packing should be selected to suit the outer
dimension of the completed installation.
• When using seal tape on pneumatic tubing, do
not apply tape on the rst two threads from
the tip of connector. This may block the air
passage and cause malfunction of the valve.
• When using liquid packing (seize lock) on
pneumatic tubing, care should be exercised
so the liquid does not leak into tubing. It
may block the air passage, resulting in valve
malfunction.
• Avoid electrical work in rainy weather or at a
time of high humidity. Any intrusion of water
into connector or terminal will cause rusting
and electrical leakage.
• Covers of accessories such as the positioner are
provided with a seal packing (gasket). Exercise
care so as not to misplace or lose them while
electrical work is in progress.
• Exercise care so as not to lose xing screws
of accessories such as the positioner. When
tightening screws, ensure that packing is in
place and tighten screws with an even torque.
• Cable threads and conduit seal should be
tightened so as to ensure that water does not
get in.
Y
Seal
tape
Two threads
Liquid run
Positioner