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UPS Modules - Listed below are 208 input units without internal isolation transformers. Systems with internal isolation transformers are also available. Wilson Engineered Systems general recommendation is to provide isolation either before or after the UPS module to allow a true external catastrophic bypass panel around the UPS. We can provide these transformers as part of the overall system. Complete UPS System requires UPS module, batteries (internal or external), startup. Optional items are additional or external batteries, maintenance bypass panel, network monitor, remote mimic panel, facility monitor, battery monitoring. UPS Modules
For longer time needs external battery cabinets are available. The Series 4200 UPS requires a nominal 288 VDC battery. These batteries will float charge at 324 to 331 VDC. During a discharge the battery energy will be used as the battery drops to approximately 240 VDC. The battery cabinet will have a DC breaker with monitoring contacts and the ability to remote trip in either a safety emergency or when the batteries become too depleted and further discharge would be harmful. There are a multitude of battery configurations available. Below are selections for nominal time and for selections which make sense in terms of good price points and serviceability. Generally we recommend against batteries in the 100 lb each range for service and changeout reasons. Batteries are C&D High Rate Sealed Valve regulated Batteries
Maintenance Bypass Panels All electrical equipment shuild have maintenance performed at least annually. Certainly a critical power system such as a UPS should be maintained. To properly do so either a maintenance bypass panel, second isolated UPS or load shutdown is required. We recommend a maintenance bypass panel on all three phase UPS. An internal maintenance bypass within the UPS cabinet does not meet this need. For safe servicing the bypass panel must be external. That is also why voltage stepdown should not occur within the UPS. Below are the part numbers and sizes for the proper external maintenance bypass.
Monitoring Accesories A network UPS monitor will allow direct communication from the UPS to an ethernet network. This allows remote viewing of UPS status as well as network based logging of UPS performance. During non standard conditions SNMP traps or emails may be sent out. Other monitoring options include a network based facility monitor interfacing with the UPS alarm contacts such as "On Inverter", "On Bypass", "On Battery", "Low Battery" or "Unit Fault". Typically with this monitor additional conditions such as UPS room or area temperature will also be monitored. The lowest level of remote monitoring would be a remote status alarm panel which provides LEDs and a system mimic schematic to indicate UPS status or alarm conditions. The remote status alarm panel includes an audible alarm.
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Site Update 03/26/08 |