Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
Document ID: 4557
SSD Installation Instructions
Published Date: 2019.08.20
2.
Measure the steady-state short-circuit AC-RMS current
between the SSD connection points with a clamp-on
ammeter. The short-circuit AC-RMS steady-state current
measured should be less than the steady-state AC current
rating of the SSD model ordered.
3. After installation, the DC voltage across the SSD terminals
can be measured to confirm that the expected value of
cathodic protection voltage exists, assuming the cathodic
protection system is ON. (The voltage measured with a
voltmeter will be less than the actual cathodic protection
voltage because it is not being measured with respect to a
reference cell.)
4. After installation, the steady-state AC current through the
SSD conductors can again be measured. The current
measured should be comparable to the value measured
prior to installation since the AC impedance of the SSD is
negligible (i.e., about 10 milliohms at 60 Hz).
5. To verify correct device operation while in service, measure
the pipe to soil voltage using a reference cell. An acceptable
CP reading will indirectly indicate correct operation with DC
isolation, as device conduction would bond the CP system
to ground (or to the other connected structure) and affect
the CP reading. While an indirect test, it has proven to be a
good indicator of operation. An unacceptable reading may
be due to other factors besides the Dairyland device, and if
needed perform the following additional tests.
6. The definitive test is one performed with the device out of
circuit. If the device is in service, disconnect the CP structure
attachment conductor (typically at the negative terminal) so
that the product is isolated, but first addressing any safety
issues such as adding a current-rated bonding jumper
between the two connection points, wearing insulating
gloves, etc. Note that if the Dairyland device is performing
mitigation of induced AC voltage, disconnecting the device
will leave the structure as an open circuit, and the induced
voltage on the pipeline may rise to high levels. Therefore,
take appropriate safety measures before proceeding.
Next, momentarily short the device terminals to remove
any residual charge that may be on the internal capacitor.
Connect a multi-meter, set to the lowest Ohms scale, across
the terminals. If the product is functional, the resistance
will start at zero ohms and then very slowly increase as
the capacitor in the decoupler begins to charge from the
multi-meter. The test may be discontinued at this point, as
charging the capacitor can take up to 10 minutes, and it is
only necessary to observe this general response briefly. If
the product is failed, the reading will remain fixed and at a
very low resistance value, typically a fraction of one Ohm.
If any measurements do not produce the expected results,
contact Dairyland.
GENERAL COMMENTS
The SSD does not require routine maintenance, but if the
cathodic protection voltage level near the SSD is below the
normal or expected value, it is suggested that the unit be field
tested following procedures available from Dairyland.
If a problem is suspected, contact Dairyland for trouble-
shooting assistance. If repairs are necessary the unit is to be
returned to Dairyland for diagnosis and repair after requesting
a Return Material Authorization (RMA).
The SSD is designed to fail as a short-circuit to assure safety
grounding at all times if the unit fails due to excessive AC fault
current or lightning current beyond rating.
ATEX AND IECEx COMMENTS
• The device shall be placed into service in accordance with
the ratings and limitations stated in the installation and
operating instructions.
• No ongoing maintenance is required, as the device is designed
to be maintenance-free, and is of solid-state construction with
no moving, wearing, or serviceable parts.
• During installation the device should be handled and mounted
in a location so that direct impact is minimized.
• Regular testing of the device is not required. Users who
desire to verify the operating condition of the device should
refer to the section entitled “Field Testing.” Observe all safety
precautions described, in addition to industry or company
safety practices.
• WARNING: Potential electrostatic charging hazard – Plastic
enclosures are to be cleaned or wiped only with a damp cloth.
• Products marked CE, Ex II 3 G are Equipment Group II,
Equipment Category 3, and comply with the Essential
Health and Safety Requirements relating to the design and
construction of such equipment given in Annex II to the
Directive 94/9/EC.
• This equipment is intended for use in area in which explosive
atmospheres caused by gasses, vapors, mists, air or dust
mixtures are unlikely to occur, or are likely to occur only
infrequently and for short periods. Such locations correspond
to Zone 2 classification according to ATEX Directive 94/9/EC.
• This equipment complies with standards EN 60079-0:2012
and EN 60079-15:2010 per certificate number DEMKO 05
ATEX 0431689X and IEC 60079-0 Ed. 6 and IEC 60079-
15 Ed. 4, per certificate number IECEx UL 14.0021X. The
Quality Assurance Report is based on ISO/IEC 80079-34:
Edition 1 2011-04.
