Yokogawa PK200 - Manual (Page 16)

IM 21B03D01-01E 4-2
4. WIRING AND PIPING
4.2.2 Wiring
(1) Install wiring away from noise sources such as a
large capacity transformer, motor, or power supply.
(2) Remove terminal box cover and wiring connection
dustproof plugs, then connect wiring.
Using an Allen wrench (width 3mm), unscrew the
locking setscrew and remove the flameproof cover.
Then, connect the wiring and when installing the
cover, do not neglect to fasten shrouding metal.
(3) It is recommended that clip-on terminals R1.25-5
or R2-5 be used for wiring termination (JIS C
2805).
(4) It is also recommended that wiring be installed in
conduits and ducts to provide protection against
water or external damage. For flameproof external
wiring, see 1.6 Installation of Flameproof Type”
and “INSTALLATION AND OPERATING
PRECAUTIONS FOR TIIS FLAMEPROOF
EQUIPMENT” at the end of this manual.
(5) When installing a flameproof gland packing
adapter (option code: /G11 and /G21) for cable
wiring, observe the following steps.
a. Release the shrouding metal and remove the
terminal box cover.
b. Measure the outside dia. of the cables to be used
in two directions in 0.1mm unit.
c. Obtain the average value of the measured values
in two directions and select a gland packing
whose inner dia. is nearest to the average value
from among those in Table 4.1.
d. Screw the flameproof packing adapter into the
terminal box until the O-ring touches the
terminal box wiring port (at least 6 full turns),
and tighten the lock nut.
e. Insert the cable through the union cover, the
union coupling, the clamp nut, the clamp ring,
the gland, one washer, the rubber packing, and
the packing box, in that order.
f. Insert the end of the cable into the terminal box.
g. Tighten the gland to grip the cable. When
tightening the union cover, tighten approximately
one turn past the point where the cable will no
longer move up and down.
Proper tightening is important. If it is too tight, a
circuit break in the cable may occur; if not tight
enough, the flameproof effectiveness will be
compromised.
CAUTION
Tighten the gland approximately one turn after
the point where you can no longer shift the cable
up and down by hand.
Take great care in this step, since proper
tightening is very important.
h. Fasten the cable with tightening the clamp nut.
i. Tighten the lock nut on the union cover.
j. Connect the cable wires to each terminal.
Table 4.2 Type of Packing and Applicable Cable O.D.
G1 / 2 8-10 16 8-10 G9601AM
10.1-12 16 10-12
G3 / 4 10-12 22 10-12 G9601AN
12.1-14 22 12-14
14.1-16 22 14-16
Wiring port
thread diameter
Appropriate
cable outer
diameter (mm)
Identifying
mark
Part Number
T0402.EPS
(6) Install a sealing fitting (option) to be used for
metal conduit lines, in the following order.
a. Assemble a sealing fitting into the instrument.
Apply sealing compound to the nipple provided
and screw in the nipple by seven to eight turns,
then fix it with a lock nut.
b. Install wiring using insulated wires and provide a
compound filling chamber of inorganic material
by using sealing dams. (See Figure 4.5.)
c. Fill sealing compound from the compound filling
port until the fitting is filled with the compound.
Example of sealing compound
Shimada Electric (1kg can)
For FG5: Approx. 100g/P. filling
For FG6: Approx. 115g/P. filling
d. After the compound has been sufficiently
softened, screw the plug into the filling port.
e. Connect a metal conduit for piping (JIS C 8305)
or explosion-proof flexible fitting to the sealing
fitting by engaging five or more threads.
f. For the details of sealing, see 3.3.2.3 in the
“Recommended Practice of Explosion-Protected
Electrical Installations in General Industries”
published by the Industrial Safety Institute,
Ministry of Labor (Japan).