SNS20-28C Actuator with Internal Battery Back-up Installation, Operation & Maintenance Manual
Page 19
TROUBLESHOOTING AND FAQ’S
SYMPTOM
PROBLEM
SOLUTION
A
CTUATOR
D
OES
N
OT
R
ESPOND
T
O
C
ONTROL
S
IGNAL
.
Power not on
Turn on power
Actuator wired incorrectly
Check wiring diagram & rewire
Wrong voltage
Check power supply & make
appropriate changes
Thermal overload activated
Check and replace 10A Motor
Fuse
–
see Part Numbers
Actuator and valve in opposite
Remove actuator and rotate 90
positions when actuator was mounted.
degrees & remount
Input Power Fuse Blown
Replace with proper value fuse
Input signal wires not tight in terminals
Tighten terminal block screws
Bad Brake
Remove brake hub & try to run
Modulating Signal Not Present
Connect 4-20mA or 0-10vdc
Signal to Actuator
A
CTUATOR
W
ILL
N
OT
O
PEN OR
C
LOSE
C
OMPLETELY
.
Travel limits set wrong
Reset cams.
Valve torque too high for actuator
Install correct size actuator
Mechanical stops not removed
Remove stops, CAUTION: Do
not remove any part required for
proper operation
Modulating Actuator Set Points Adj.
Adjust the SPAN or ZERO pots
On the Modulating Board
V
ALVE
O
SCILLATES
.
Valve torque too high for actuator
Install correct size actuator.
Actuator without brake installed on
butterfly valve
Install brake
Motor brake out of adjustment.
Adjust brake
Set screw loose in brake disc
Adjust brake and tighten set-
screw
M
OTOR
R
UNS BUT
O
UTPUT
S
HAFT
D
OES
N
OT
R
OTATE
.
Gear damage or sheared pin/key
Contact ICI or nearest
distributor
