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Performance
Characteristics and Features to look for in a UPS System |
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| Reliability |
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Overall System Design
- What is the MTBF of the system? Manufacturers should have
this data.
- Minimum single points of failure either with single module or
parallel system ( Centralized Bypass is a single point of failure)
Redundancy
- UPS should have redundant design features such as Fans,
Power Supplies, Batteries, parallel communication buss.
Topology
- Double conversion for greater load protection
- Distributed static switches for parallel operation
- Dual Input capable
- Six pulse SCR or IGBT rectifier
- Transistorized PWM or SCR inverter
Design History
- Field proven design, large number of installs.
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| Installability |
Standards
- UL 1778 Listed
- FCC Class A, Part 15 Compliant
- IEEE 587 B Voltage Surge Withstand
EPO
- Remote EPO capable per NEC
Foot Print
- Minimum footprint for UPS module, battery,
and options
Wiring Terminations
- Top and bottom cable access
- Are lugs included?
Field Retro Fit Capability
- Can parallel UPS module be added in the field?
- Can other options be added in the field?
Maneuverability
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| Source Compatibility |
Efficiency
- 92.5 – 94% good for double conversion.
Low Input Harmonics
- <30% THD for 6-Pulse rectifier.
- <7% THD with optional 5th Harmonic filter.
- <4% THD with optional 11th Harmonic filter
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FCC rating
- FCC Class A, Part 15 tested.
Building Interfaces
- Remote EPO capable
- External contacts for remote alarm annunciation
- Programmable contacts
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Generator Interface
- Smart Filters available to reduce harmonics
- Contacts available to communicate with generator
- Adjustable parameters such as slew rate and phase angle.
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| Output Performance |
Space Vector Modulated (PWM) inverter recommended for
superior output performance.
Voltage Regulation
- Line to Line – No more than +/-1% Vreg. for static loads
- Line to Neutral – No more than +/-3% Vreg. for 100% load imbalance
Transient Response
- Step Load Response – No more than +/-3% THD for steps of 0-100%
- Recovery Time – Recovery to within +/-1% THD in less than 1 cycle
Non-Linear Capability
- Distortion with Non-linear loads –
No more than 3%THD for 100% non-linear load.
Overload Capability
- Inverter ability – 125% for 10min, 150% for 60sec
- Bypass ability – 110% continuous, 200% for 5min, 1000% for ½ cycle
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| Serviceability |
Component Layout
- Front access to main components and assemblies.
- Internal Maintenance Bypass to reduce down time.
- One main control board that is interchangeable with
other kVA sizes, reduces parts count.
Diagnostics
- Open Architecture, no proprietary software or hardware
required for service or preventative maintenance.
- Adjustments using parameters not potentiometers.
- Remote diagnostics available.
- User accessible alarm history.
- Battery Management Software.
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Parts Availability
- 7x24 Service Center with localized parts depot.
- Nation wide field service engineers.
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| Features and Options |
Batteries
- Full Line of matching battery cabinets available
- UPS compatible with wet cell and flywheels
Software
- Full line of monitoring, protection and management
software available
- Remote Monitoring and Diagnostic services.
Transformers
- Full line of input and output isolation and voltage
matching transformers available.
External Monitoring
- Remote Status Panel options
- SNMP or RS422/485 ports
Switchgear
- External Bypass Panels, Load Static Switches, PDU’s
and Automatic Transfer Switches available
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