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Maintenance
SPDs require minimal maintenance. Periodic inspection of
diagnostic LED indicators ensures proper operation. Clean
SPD as appropriate.
Troubleshooting & Service
Please contact Siemens Technical Support at 800-333-7421
for service related issues.
Quality SPDs are designed and tested to withstand severe
duty. However, there are various electrical anomalies against
which SPDs cannot protect. These are generally Sustained
Overvoltages also known as Temporary Overvoltages (TOVs).
In this context, Sustained Overvoltages may be only a few
cycles. Failed SPDs tend to be symptoms, not root causes.
There may be larger issues at play. Regardless of cause,
SPDs attempt to protect their load until failure.
Bonding or reference to ground problems are the root
cause of many SPD problems. If the SPD shows problems on
startup, there is reasonable chance of bonding/grounding/
misapplication issue. Such problems permanently damage
the SPD. If not corrected, SPD problems will reoccur.
Tip: Visually confirm N-G bonding. Be aware that a voltmeter
measuring N-G can be misleading. For example, N-G voltage
could read 0V because neutral and ground are at the same
potential purely by happenstance, not because they are
bonded. Visually confirm bonding.
Tip: Experience indicates that regulation-challenged
generators can cause Sustained Overvoltages, as well as
ungrounded generators, and/or usual load transfer systems.
Abnormal N-G Voltage Indicators
This SPD include N-G voltage indicators. If the SPD detects
excessive N-G voltage, the Red Service LED will blink and the
Audible Alarm will cycle. This condition requires immediate
attention as the SPD will fail.
Incorrectly bonded distribution systems damage SPDs.
If the XO or N-G bonding jumper is not installed, the
electrical system has no reference to ground. It becomes an
ungrounded system. Please see previous section regarding
SPDs on ungrounded systems. Such systems are known to
eventually produce abnormally high L-G voltages. SPDs will
attempt to chase this system-level overvoltage abnormality
until the SPD fails. This effect is accelerated on Wye systems
where SPDs are designed for grounded systems. (SPDs for
ungrounded systems generally have higher MCOV to allow
for L-G voltage fluctuations.) Failures of this nature are not
defects in the SPDs workmanship or material. This is an
installation error and is not covered by warranty.
A differential voltage circuit monitors neutral to ground
voltage. When N-G voltage becomes excessive, an
amplifier energizes a resistor. Eventually, that resistor
will overheat and cause thermally sensitive shrink wrap
to shrink around the resistor. This does not occur on
transient or instantaneous N-G overvoltages. When the
SPD is deenergized, the shrink wrap covered resistor
can be accessed by qualified personnel under the
display plate cover.
Installation Guide / User Manual
Module Replacement & Service
The module is field replaceable. Service should only be
performed by qualified persons. Deenergize SPD, confirm
with appropriate measurement equipment and discharge
internal capacitance to ground. Mark locations and
carefully disconnect diagnostic cables, contacts, connecting
conductors, etc. Remove entire TPS4 unit from the Panel.
Reinstall in reverse.
There are no user serviceable parts inside the module.
Disassembly is not permitted.
Modules may be returned to the factory for factory service,
qualification and return. Please contact factory at
800-333-7421 for assistance.
Display Replacement
The display is field replaceable. Service should only be
performed by qualified persons. Deenergize SPD, confirm
with appropriate measurement equipment and discharge
internal capacitance to ground. Mark locations and
carefully disconnect diagnostic cables, contacts, connecting
conductors, etc. Unbolt display and replace. Reinstall
in reverse.
Note that a sealing gasket between the display and the
enclosure is a key component ensuring weather resistance.
Replace the gasket whenever the display is removed.
Preventive Maintenance (Inspection & Testing)
Inspection of the TPS4 SPD unit should be performed
periodically, to maintain reliable system performance and
continued transient voltage surge protection. The large
variations in operating conditions encountered by units in
the field make it difficult to set a fixed maintenance interval,
but inspections utilizing the built-in diagnostics should be
performed at least on a weekly or monthly basis.
Corrective Maintenance (Repair)
The Siemens TPS4 unit is designed for years of reliable,
trouble- free operation. Unfortunately, in an extreme case,
you may experience an alarm condition. In this event, no
attempt should be made to repair the TPS4 itself. There are
no serviceable parts within the unit. Any SPD that requires
service should be appropriately removed from the electrical
distribution equipment, and replaced by a new SPD of the
same model.
Technical Support
800-333-7421
Prior to calling Siemens TPS4 Technical Support for
assistance or ordering parts, please have the following
information available:
TPS4 model number: __________________________________
Manufacture date: ____________________________________
Date of Purchase: _____________________________________
Your order number: ___________________________________
Return Shipment:
Contact Siemens Customer Support, 866-663-7324 to
setup an RMA.
| TPS4-01 Surge Protection Device
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