Azbil SVX100, User Manual

Page: 31 / 84

21
To initiate auto-setup using the zero and span adjustment switches
Step Procedure
1 Set the input signal to the SVX to 18 ±1 mA DC
2 Hold the “UP” switch down until the auto-setup program starts (approx. 3
seconds) then release the “UP” switch.
3 The valve moves from fully shut to fully open twice. The valve then opens to
about 50% and stays this way for up to three minutes.
4 Confirm that the auto-setup routine is complete by varying the input signals. The
entire auto-setup procedure should take about three minutes.
5 If the input signal drops below 4 mA while auto-setup is running, then auto-setup
will fail and must be restarted. After completing auto-setup, keep at least 4 mA of
signal (power) for at least three seconds to make sure data and parameters are
stored in SVX memory.
Note)
„
Do not lower the input signal (4-20 mA) to a level less than 4 mA. (The level of the signal can
be set to any level in the 4-20 mA range without problem.)
„
After the operation has completed, check valve operation by varying the input signal and
verifying that the valve goes to the correct position corresponding to the signal. If the span
position has shifted, perform a span adjustment operation. (Refer to “3-2: Zero and span
adjustment” on page 22.)
„
In some cases, the auto-setup routine will not properly detect your valve, especially if the
valve’s actuator is smaller than Azbil Corporation’s HA1 type actuator (diaphragm capacity
of (850 cm 3 {52 inches 3 })) or the operation stroke is smaller than 14.3 mm {9/16 inches}. If
this occurs “4-4-4: Control configuration” on page 37.
„
There is a possibility that the forced open value “4-4-7 : Tvl cut off (Travel Cutoff)” on page
41, may change after performing the auto-setup operation. If necessary, reset the forced fully
open value.
„
If the booster relay is on, and is operating the auto-setup function, there might be a
possibility of hunting. In this case, adjust the booster’s sensitivity or refer to “4-4-4: Control
configuration” on page 37 and adjust the dynamic characteristic manually.
„
If PARAM0 is selected for the actuator size selection item, auto setup will be performed once
from the fully closed to fully open position and back to fully closed. Also, the actuator size will
not be automatically set.
„
The “DOWN” adjustment switch is only for the auto-setup function of Azbil Corporation’s
model VFR. Do not use the “DOWN” adjustment switch with any other actuator.