Nor-Cal Intellisys Throttling Butterfly Valve - Manual (Page 10)

10 10 Visit our Web Site www.n-c.com
TBV-OP-LIT 01/04
I
NTELLISYS
T
HROTTLING
B
UTTERFLY
V
ALVES
11 Call toll free 800-824-4166 or 530-842-4457 • FAX 530-842-9130
TBV-OP-LIT 01/04
I
NTELLISYS
T
HROTTLING
B
UTTERFLY
V
ALVES
5.0 - Product Support
Troubleshooting: The Nor-Cal Products’ TBV control valve is designed for years of maintenance free operation. MTBF has been determined to be in excess
of 2,000,000 operating cycles or 65,000 hours of typical continuous operation. However, some regular inspections and Preventive Maintenance will ensure
that unexpected failures do not occur. Please refer to Table 5.1 for recommendations on TBV-series preventive maintenance and service.
TABLE 5.1 – RECOMMENDED TBV-SERIES PREVENTIVE MAINTENANCE ACTIONS AND INTERVALS
RECOMMENDED ACTION PURPOSE / WHAT TO LOOK FOR RECOMMENDED INTERVAL
With controller power OFF , but valve still installed in
system, manually turn TBV shaft via rear shaft slot or
rotary arm (depending on model).
Feel for areas of high friction or binding, as they may
indicate a build-up of process by-product or valve plate
misalignment due to uneven heating.
Weekly, initially, until a process specific service interval has
been determined for the valve.
Remove TBV control valve from system for visual
inspection.
Look for process build-up. Also, inspect for areas
showing scratches in plate edge or valve inner bore.
The latter can be a sign of plate misalignment, possibly
due to uneven heating.
Monthly, initially, until a process specific service interval has
been determined for the valve.
With controller power OFF , remove TBV drive unit and
inspect Oldham coupling disk (valve body can remain
installed in vacuum system)
Inspect for Oldham coupling disk wear and fit.
The presence of a whitish powder indicates disk wear.
Also, the disk should fit snugly on each of the two
hubs, and remain on even when upside down.
After 3 months of use, and then every 3 months, until a
process specific service interval has been determined.
Remove TBV control valve from system and
perform leak check.
Determine loss of shaft seal integrity. All new valves
are tested to 1 × 10 -9 atm·scc/sec He
Every 6 months, unless extremely high temperatures or highly
aggressive chemicals are used.
Disassemble valve body to access bearings and O-rings
High vacuum grease used can gradually disappear due
to evaporation or chemical attack. The O-ring seals
can wear or crack due to contamination, chemical
attack or excessive heat.
In heated applications: after 12 months of continuous use.
In low temperature applications: after 24 months
of continuous use. Or, whenever a leak is found
via leak detection.
Aside from the Oldham coupling disk and shaft O-rings, there are no user serviceable parts or components in the TBV-series valve. If a problem does occur with
the TBV control valve, please refer to the basic troubleshooting instructions below or contact Nor-Cal Products Intellisys Customer Support at 800-824-4166 to
obtain additional instructions or a Return Materials Authorization number.
NOTE: A pressure control system issue may not be related to the throttle valve itself. Please also refer
to the Adaptive Pressure Controller Operating Manual for related troubleshooting tips and actions.
Some basic troubleshooting can be done by the user referring to the instructions and suggestions below.
Table 5.2 describes common symptoms and recommended actions.
TABLE 5.2 – POSSIBLE FAILURE MODES AND RECOMMENDED ACTIONS
SYMPTOM POSSIBLE CAUSES RECOMMENDED ACTION
The TBV does not appear to turn on or operate.
The TBV is not connected to the controller module
(standard TBV models only)
Check to make sure the controller-to-valve cable is connected
at both ends, using the correct connectors.
The controller-to-valve cable is faulty (standard TBV
models only)
Try another TBV-CRD-XX cable.
The controller module is not on, or is faulty.
Check controller module and refer to appropriate controller
Operating Manual
The TBV appears to operate but pressure- or position
control is inconsistent and poor
The valve plate is jammed or partially
jammed in the valve bore.
Turn off controller power and attempt to move the valve shaft
by hand. If binding is observed, remove valve from system
to determine the root cause. Clean off process residue as
necessary using a non-abrasive method. If plate or valve bore
are damaged, contact Nor-Cal Intellisys Customer Support
The Oldham coupling disk is worn or cracked
Turn off controller power. Remove drive unit from valve.
Replace the Oldham coupling disk as necessary.
A whining or buzzing sound is heard from
the TBV motor drive
The Oldham coupling disk, or possibly hubs, is loose
or worn and a harmonic resonance point has been
excited
Turn off controller power. Remove drive unit from valve.
Replace the Oldham coupling disk as necessary. If problem
persists, contact Nor-Cal Intellisys Customer Support.
The controller motor control coefficients have been
corrupted.
Turn off controller power. Turn back on and allow
initialization sequence to complete
The wrong controller is being used.
Note model and serial number of valve and controller and
contact Nor-Cal Intellisys Customer Support
The motor and valve shaft rotate continuously in one
direction without stopping
The rotor arm used for determination of OPEN and
CLOSED during valve initialization is broken or missing
Contact Nor-Cal Intellisys Customer Support to obtain and
RMA#
The valve has developed a leak to atmosphere along the
valve shaft
O-ring damage and/or loss of vacuum grease can
cause this
The valve plate and shaft need to be removed from the
body so that the O-rings can be replaced and/or re-greased.
Please contact Nor-Cal Intellisys Customer Support to obtain
instructions, or to get an RMA# for valve return.