User Manual

<2. WIRING AND INSTALLATION>

2-7

IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00

2.5 Sensor wiring

The FLXA21 can be used with a wide range of commercially available sensor types, both from

Yokogawa and other manufacturers.

TerminalscrewsizeisM4,andtorqueofscrewupis1.2N•m.

Pin terminal, ring terminal and spade terminal can be used.

 Pinterminal:pindiameter:max.1.9mm

 Ringandspadeterminal:width:max.7.8mm

For details on the sensors, refer to the respective instruction manuals of the sensors.

NOTE

Whenthewiringofsensorsisnished,besuretoattachthewiringcovers.Furthermore,make

sure the module is locked with the mechanisms on the left and right of the module.

Lock

Unlock

Figure 2.8 Locking the module

NOTE

Conrmthatalllocking-tabs(includingforBLANKslots)are“Locked”positionwhenclosethe

front panel.

Iflocking-tabsare“Unlock”position,thefront panel may be interfered with locking-tabs.

NOTE

Wheninput2isused,theupper-levelmoduleisforinput1.Becarefulnottomakeamistake

when wiring the modules.

Wheninput2isused,rstwireinput2whichisonthelowersecondmodule,andattachthe

wiring cover.

Evenwheninput2isnotused,rstattachthepowersupply/groundingwiringcoverandthenthe

wiringcoverforthesecondmodule,andnallywireinput1.

When all sensor wiring is completed, close the front panel of the FLXA21, and turn on the power.

Make sure that the display is normal.

CAUTION

Donottightenupfourfrontpanelscrewsonebyone.

Eachfrontpanelscrewshouldbetightenedupintwotimesofscrewing.And,rstlythescrewat

theupperleftshouldbescrewedabit,thenextisatthelowerright,thirdisattheupperright,and

fourthisatthelowerleft.Thesecondroundisthesamesequenceagaintotightenupfourscrews.

Donotuseanelectricscrewdriverwithhighrevolutions.Ifanelectricscrewdriverisusedfor

these front panel screws, the revolutions of the electric screwdriver should be less than 400 rpm.

Fourscrewsshouldbetightenedtothefollowingtorque;

0.8 to 0.9 N•m (for the plastic housing)

1.5 to 1.6 N•m (for the stainless steel housing)

ISC

SENCOM