19
Model EA91A＆EA90A
CALIBRATION
6
IMPORTANT
WARNING
OUT
SUP
Supporting Point
Supporting
Lock Screw
Stroke Adjustment Lever
Stroke Adjustment Knob
Each unit of the Positioner is completely
calibrated and inspected before delivery.
However, slight error may occur due to vi-
bration and impact during transportation.
Be sure to perform calibration and loop
test of the Positioner before operation.
IMPORTANT
When the stroke adjustment lever leans
with same angle in both right and left
angle with reference to the leaning angle
50％ as origin, the specifications of
linearity will be satisfied.
Do not open the cover of the terminal box for
using Flameproof Explosion-protected type
(Model EA91A) during power-on. When
circumstances require opening the cover during
power-on, properly make sure that no explosive
gases are present using gas detector before
maintenance.In this connection, it is possible to
inspect and adjust with the cover removed.
However, be very careful not to generate impact
sparks during maintenance.
6.1 Advance Check before Calibration
⑴ Switching of Direct/Reverse Action for Linear
Motion Actuator
Perform switching of direct/reverse action of
the Positioner by changing the supporting
point (minus groove of lever column) of stroke
adjustment lever.
Supporting Point of DA (Direct Action) :
Upper Side
Supporting Point of RA (Reverse Action) :
Lower Side
⑵ Switching of Direct/Reverse Action for Cam
It is possible to switch action by mounting the
cam in accordance with inscription on cam.
(Inscription : DA, RA)
⑶ Check of Stroke Adjustment Lever
Make sure that the stroke adjustment lever is
placed vertically at the 50% point in rated
stroke (or angle). Perform manual switching
mechanism with "M" for manual operation.
(Refer to Item 6.8 "Manual Switching
Mechanism")
Installing Position of Stroke
Adjustment Lever for Reverse Action
Installing Position of Stroke
Adjustment Lever for Direct Action
Zero Adjustment
Knob
(Decrease output:
turn upward,
Increase output:
turn downward)
