Maintenance, Dry Contact Connection Configuration

Dry Contact Option

Two sets of Form C dry contacts are included with the Dry Contact option. Dry Contacts change state during inoperative conditions, including loss of power. Any status change can be monitored elsewhere via Dry Contacts.

A Terminal Block includes two sets of Normally Open (N.O.) and Normally Closed (N.C) contacts. Both sets of contacts operate the same. This is shown in Figure 10.

Figure 10: Dry Contact Connection Configuration

DRY CONTACTS

NO C NCNC C NO

A typical application using a Normally Closed configuration would connect to one set of the N.C. and Common terminals. During an inoperative condition, the SPDs dry contact would change state from Normally Closed to open. The Normally Closed configuration is recommended because it will detect a wiring defect, such as cut wire(s), where N.O. will not.

Please note: Dry Contacts are designed for low voltage or control signals only.

•Maximum switching current is 5A

•Maximum switching voltage is 240V DC or AC.

•Higherenergyapplicationsrequireadditionalrelayimplementation outside the SPD.

An optional Remote Monitor accessory is available to provide visual and audible status. The Remote Monitor will consume one of the two sets of Dry Contacts.

Remote Monitor Accessory

A Remote Monitor—Model No. RMSIE (ordered separately) is available for remote annunciation. It requires a standalone 120V power source (wall plug transformer) and uses one set of Form C dry contacts. The Remote Monitor can be configured to monitor several SPDs simultaneously. Installation is detailed in a separate document. Contact factory as appropriate.

Maintenance

SPDs require minimal maintenance. Periodic inspection of diagnostic LED indicators ensures proper operation. Clean SPD as appropriate.

Troubleshooting & Service

Please contact TPS Technical Support at 1.888.333.3545 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.

Module Replacement & Service

The module(s) is field replaceable. Deenergize SPD, confirm with appropriate measurement equipment and discharge internal capacitance to ground. Mark locations and carefully disconnect diagnostic cables, dry contact connections, phase conductors, unplug parallel connections on TPS3 15 models, etc. Depending on model, module may be bolted to backplane or the backplane may be part of the module assembly. Remove module/backplane. Reinstall in reverse order.

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 Siemens TPS Tech Support at 888.333.3545

for assistance.