H
H
M
M
-
-
S
S
e
e
r
r
i
i
e
e
s
s
E
E
l
l
e
e
c
c
t
t
r
r
i
i
c
c
A
A
c
c
t
t
u
u
a
a
t
t
o
o
r
r
I
I
n
n
s
s
t
t
a
a
l
l
l
l
a
a
t
t
i
i
o
o
n
n
a
a
n
n
d
d
O
O
p
p
e
e
r
r
a
a
t
t
i
i
o
o
n
n
M
M
a
a
n
n
u
u
a
a
l
l
H
H
K
K
C
C
21
6
Trouble Shooting
The following instructions are offered for the most common difficulties encountered during
installation and start-up.
Actuator does not respond
Verify the line voltage to the actuator
Check that the voltage matches the rating on the actuator nameplate
Check internal wiring against actuator wiring diagram
Check limit switch cams
Actuator is receiving power but does not operate
Verify the line voltage to the actuator
Check actuator torque to see if it’s greater than the valve torque
Check limit switches and cams
Check that the torque switches have not tripped
Check mechanical travel stop adjustment
Verify the actuator against valve rotation (standard units are anti-clockwise open)
Check internal wiring
Check for corrosion and condensation
Verify coupler/bracket are correctly installed and is not causing binding
Actuator runs erratically
Check ambient temperature
Verify that the duty cycle has not been exceeded
Check the position of the manual override lever
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