Toshiba LF494 - Manual (Page 26)

TOSHIBA
6 F 8 A 0 7 7 4
5.1 Cables
Use the kind of cables shown in Table 5.1 to vsdre the converter.
Table 5*1 Cables
Nnme Cable type Nominal
cross-sectional
area
Overall diameter
Power cable Three-wire sheathed
cable (Note)
2
mm^ 11 to 15 mm
I/O cable The number of wires for the output cable depends on the
system specifications. Use
a
shielded cable with nominaJ
cross-sectional area of 1.25 mm^ and overall diameter of
11 to 15 mm.
Notei Use a four-wire cable if the arresters are to be used. See Figure 5.1 below.
5*2 EtKlernal Device Connections and Grounding
The terminal board comieciion;s of ihe 1T494/LF404 flowmeter are shown in Figure 5.1.
Proceed with wiring as described in Section 5.4, “Wiring Procedure."’
If power supply is specified as DC, use LI ds positive (+) and L2 as negative (-) terminals.
Instrument Panel:
ordered separately
Flowmeter
(■*■) Hs)
I LI I l^|FGt|l 3 tc|[cq *4 rn|noa|DQl| " f ^ I
IV wire
5,5mnr
or more
T
Currentoulput (4-20mAde)
. V L>jgita] Output 1
: > ragiu^ O^rtput 2
‘ > Digital Input (20 lo 30 V dc)
___________________________ ! ***^ Grounded with 1 OOtior less
^.................. I - ground resistant’^
■
7
:^
I/O cable
1
-
W
>wcr cable
^ '
— > pQWCï Supply
' \
Power Switch
*1 To use the arresters, ground the GNI) terminal using the wire shown in broken line.
* 2
Locale an cxiernal double-pole power switch on the powder line near the flow'meicr and within easy
operation. Mark one the switch as the disconnecting device for the flowmeter,
Use an appropriate swiicli of the rating shown below:
Recommended sw'ilch rating; Rating 250 V ac, fiA or more
Inrush current 15 A or more
Figure 5*1 Terminal Block Connections
-
2 5
-