CUSTOM MODIFICATION INFORMATION
When an installation needs something other than a standard unit, some of these modifications may provide the right combination to do the job and save your company money.
We have arranged the following information by individual custom modifications. Listed under each modification, we have included the applications for the modification and the benefits associated with it. The custom modifications are in no particular order, but are all based on specific situations we have encountered in the past. They are designed to promote thinking about the best way to solve the customer's problem.
The modifications presented here are representative, not all inclusive. If you need more information on anyone of these modifications, please call (740) 694-0496 and ask for Bill Speth.

1) THREE PHASE IN/SINGLE PHASE OUT
In many cases "three phase power is available on site. When single phase loads are large or not easily balanced with loads on other legs of the three phase circuit, it may be advantageous to let the UPS balance the three phase currents and supply a single phase load on the output. Since this may avoid an additional transformer, as well as save space and rewiring costs, it can have great appeal. The single phase output voltage can also be at a different voltage than the input. When this is the case, a considerable amount of external equipment is eliminated including the step-down transformer, the breakers, and the additioqal wiring and conduit.
You should note that if the unit is in bypass, the load will be unbalanced. As a special case, when single phase 120V loads are required, the load can be shared between two phases when on bypass.
2) INTERNAL BREAKER DISTRIBUTION
When it is useful, our units can be configured with internal breaker distribution for the load circuits. This keeps the wiring simple and compact. When desired, flexible conduit and connections for raised floor applications can be added in custom lengths to make installation even faster.
3) 50/60 HERTZ UPS CONVERTER
Our standard units can be ordered for 50 or 60 Hertz operation. We can provide a modification to allow for frequency conversion from a specified input frequency to the desired output frequency. While a unit operating as a converter would provide normal battery backup on loss of input power, a static bypass circuit cannot be included because of the difference in frequency between the input and output.
4) HIGH TEMPERATURE APPLICATIONS
Our standard units are rated to operate continuously in ambient temperatures up to 40 degrees C (104 F). In some environments, operation in temperatures of 50 degrees C (120 F) is required. We can meet these temperature conditions with a custom modification. You should note that we do not use a fan for cooling in our 3KV A to 20KV A units, nor do we add one for high temperature operation - we increase our capacity. We do this because fans are relatively unreliable.
For operation above 50 degrees C or for operation in hazardous environments, we can offer a sealed unit which is cooled by an equipment air conditioner.
In these applications we can include the right type of batteries for the temperature range, or remote the batteries to a cooler area if that is feasible.
We also offer a unit designed to attach to an existing air conditioning system, providing its own sealed room.
5) MUL TIPLE VOLTAGE OUTPUTS
In some cases, a customer desires to power some 120 volt equipment (like a monitor) along with a 208 single phase output to the main load. We can provide this capability as required. The KVA needs of the 120 volt circuit must be specified.
A variation of this is when two outputs are required, which may be the same voltage, but the neutrals must be isolated from each other. The necessary transformers and breakers can be included in our UPS or inverter, eliminating the cost of external transformers, breakers, and conduit between them.
6) LOAD SHEDDING OF UPS OUTPUTS
Separate branches can be provided on the UPS output circuit. Some of these branches may be shed a fixed amount of time after the unit goes on battery operation. This can be useful in special circumstances where one part of the load is needed to be maintained longer than the rest of the system.
7) FEED STATION BATTERIES
In some cases, a customer may have battery loads in addition to the UPS. A larger charger can be configured into the UPS for these situations, eliminating the need for an additional external charger.

8) EMERGENCY SHUTDOWN
Some facilities require that an emergency shutdown circuit be established for the entire computer room facility. The emergency switches are normally located at each access point in the protected area. Since UPS systems are designed to continue supplying power when AC is lost, a relay circuit (voltage and contacts specified by customer) must be installed in the UPS to shut its output off when the external emergency shutdown circuit is tripped.
9) SPECIAL ALARM CONDITIONS
Occasionally a customer may need a special alarm not included on our standard unit or they may want a contact closure for one of our alarms. Call us with the specifics.
10) SINGLE (OR THREE) PHASE VOLTAGE CHANGE
In some situations, a step up or down transformer is required to provide the correct single or three phase voltage to a critical load. The voltage change can be incorporated within the UPS thus eliminating the additional transformer, breakers, and wiring.
11) SPECIAL METER REQUIREMENTS
Process control specifications and sometimes utility specifications can require specific types of metering or accuracy. We can meet these requirements as necessary.
12) STORAGE HEATERS
If the UPS system will be stored in a very cold environment or a humid one that changes temperature sufficiently, to minimize the risk of condensation, storage heaters should be specified. In very cold conditions, typically below 20 degrees F (-6 C), there is a potential for the installed batteries to freeze. The actual danger temperature depends upon the batteries' electrolytic condition. When the unit is in operation, there is enough heat generated to preclude condensation or freezing.
13) SPECIAL SITE CONDITIONS
In some installations, the UPS system is placed in a shed or other shelter that is not well controlled. If there is a potential for insects or rodents to penetrate the shelter, special screening can be added to the UPS to prevent their potential entry into the unit.
We supply units using tin plating and tropicalizing to protect against high sulfur environment.
These are used in copper refining, sour gas, and sour oil processing.

14) OUTDOOR ENCLOSURES
Dependable Power Systems can supply units and batteries in outdoor enclosures including any heaters and ventilation that may be required, eliminating the need for a costly outdoor building. This should be considered for jobs where the units are already going outdoors, as well as for jobs where indoor space is at premium.
15) MODULAR SIZES
We have encountered situations where physical site restrictions, such as the size of an elevator, narrow hallways with sharp turns, and narrow doorways make placement of the UPS difficult. The larger systems can be modularized in units of33.5 x 85 x 33.5 inches (W,H,D). The modules can be reduced an additional two inches in width by removing the side panels to help get through tight places. Where the restrictions make it impossible to use even standard module size, a custom sized unit can be designed.
16) CUSTOM COLORS
Custom color schemes can be provided on the exterior panels and the exposed frame. The inset control panel color cannot be changed.
17) EXTENDED BATTERY OPERATION
Our standard units can provide extended run times on batteries without requiring a separate battery cabinet. The run time extensions vary by model, size, and battery type. For specific applications, please give us a call.
If a longer run time is needed, we can offer two other solutions. We can provide a single integrated unit with the additional batteries placed internally by going to a larger cabinet size, or we can add an additional module for the extra battery storage space.

18) MULTIPLE STATIC SWITCHES
When a customer has several independent critical loads, they have the choice of putting all the loads on the same UPS or placing the loads on separate UPS units. When all the loads are on the same UPS output, a significant overload on anyone of the legs might be large enough to put the unit into bypass. Once this occurs, the backup protection is temporarily lost for all loads until the overload is removed. If this is not an acceptable solution because of the highly critical protection requirements, the normal alternative is to provide separate UPS units for each load. This will insure that a problem in one critical load will not affect any other critical protection requirements, but this is an expensive approach.
A less costly solution to this problem is to use multiple static switches on the UPS' output. One static switch is configured for each load. If an over current in that load occurs, it will be switched without interruption to bypass without affecting any other load. The rest of the loads will continue to be powered by the inverter. When the overload abates, the individual static switch will return that load to the inverter. The advantage here is .the significant savings possible compared to one UPS unit for each load.
19) DOUBLE REDUNDANT UPS SYSTEMS
With the double redundant UPS system, the primary UPS(A) is back up by the second UPS(B), which is back up by the Bypass source. The load is normally feed from UPS-A. The load is transferred to the back up, UPS-B, only if UPS-A fails, the static switch is manually operated, or the manual bypass switch is operated. The load is transferred to the bypass if the an overload occurs, if both UPS-A and UPS-B fail or if manually transferred, either static switch or manual bypass switch.
20) CUSTOMER SPECIFICATIONS
Some large customers may have specifications for their UPS or charging system requirements.
Send these specifications to us for quotation. We will be happy to look them over and let you know what we can do.
21) LARGER UPS CAPACITIES
While our literature shows our largest unit as 40KV A, we have built units in sizes above 100 KVA.
Since the large ratings are not that common, we did not list it in our literature. Let us know the details and we will submit a quotation.