Liebert® PST4™ UPS
GUIDE SPECIFICATIONS
350VA to 850VA
Single-Phase Uninterruptible Power Supply Systems

1.0	GENERAL
1.1	SUMMARY
This specification defines the electrical and mechanical characteristics and requirements for a continuous-duty single-phase, solid-state, uninterruptible power system.  The uninterruptible power system hereafter referred to as the UPS, will provide high-quality AC power for sensitive electronic equipment loads.
1.2	STANDARDS
The UPS is designed in accordance with the applicable sections of the current revision of the following documents.  Where a conflict arises between these documents and statements made herein, the statements in this specification will govern.
350-500VA, 120V Models
UL STD 1778 and CSA 22.2 No. 107.1, cULus listed/labeled
FCC Part 15, Subpart B, Class B
ANSI C62.41, Category A, Level 3
EN61000-4-2, Level 4, Criteria A
EN61000-4-3, Level 3, Criteria A
EN61000-4-4, Level 4, Criteria A
EN61000-4-5, Level 3, Criteria A
EN61000-4-6, Level 3, Criteria A
ISTA Procedure 1A 
RoHS2/WEEE

660-850VA, 120V Models
cTUVus listed/labeled (certified to UL STD 1778 and CSA 22.2 No. 107.1)
FCC Part 15, Subpart B, Class B
ANSI C62.41, Category A, Level 3
EN61000-4-2, Level 4, Criteria A
EN61000-4-3, Level 3, Criteria A
EN61000-4-4, Level 4, Criteria A
EN61000-4-5, Level 3, Criteria A
EN61000-4-6, Level 3, Criteria A
ISTA Procedure 1A 
RoHS2/WEEE

1.3.	SYSTEM DESCRIPTION
1.3.1	Modes of Operation
The UPS is designed to operate as a standby/offline system in the following modes:
A.	Normal - The critical AC load is continuously supplied with filtered power.  The battery charger maintains a float-charge on the battery.
B.   Battery - When the input power source exceeds the parameters defined in section 1.3.3.1, the critical AC load is supplied power by the inverter, which obtains its power from the battery.  Typical detection and transfer time is 8 ms.
C.	 Recharge - Upon restoration of utility / mains AC power, after a utility / mains AC power outage and complete or partial battery discharge, the unit automatically restarts and resumes supplying power to the critical AC load. The battery can be charged from the utility whether the UPS is ON or OFF.
D.	Battery Start - The UPS is capable of starting without input power.  The unit starts up and operates from the battery, with output frequency set to factory defaults of 60Hz for 120VAC units. 
1.3.2	Design Requirements
A. Voltage:  Input/output voltage specifications of the UPS are:
Input: 100-140 VAC, 60/50 Hz auto-sensing, single-phase, 2-wire-plus-ground.

Output (on utility): 120 VAC, -24/+26 VAC, 60/50 Hz, single-phase, 2-wire-plus-ground. 
Output (on battery): 120 VAC, ±10 VAC, 60/50 Hz, single-phase, 2-wire-plus-ground. 

B. Output Load Capacity: Maximum specified output load capacity of the UPS, regardless of load power factor, is:
•	350VA / 200W
•	500VA / 300W    
•	660VA / 400W	
•	850VA / 500W	

C. Internal Battery: The battery consists of valve regulated, non-spillable, maintenance-free, sealed, lead-acid cells.  The battery is user replaceable and hot swappable, not requiring the UPS to be powered off.  
D. Battery Reserve Time: 2 minutes typical runtime at full load and an ambient temperature of 77F (25C).
E. Battery Recharge: The UPS contains a battery recharge rate designed to prolong battery life. Recharge time is 8 hours to 90% capacity after a complete discharge into full resistive load.

1.3.3	Performance Requirements
1.3.3.1	AC Input to UPS
A. 	Voltage Configuration: The UPS operates at these values without drawing power from the batteries.
120 VAC nominal: single phase, 2-wire-plus-ground: 96 - 146 VAC (±3 VAC), 

B. 	Frequency: The UPS automatically senses the input frequency and operates within the following frequency specifications without drawing power from the batteries.

50 Hz Applications:	 45 - 55 Hz (±1 Hz)
60 Hz Applications:	 55 - 65 Hz (±1 Hz)

C. 	Surge Protection: The UPS units can withstand input surges of up to 320J without damage per criteria listed in IEEE C62.41, Category A, Level 3 on the AC input.  

350-500VA Models: Telephone/Data line surge protection shall be 70J without damage.

660-850VA Models: Telephone/Data line and Coax cable surge protection shall be 70J without damage.

D. 	Input Connections: The 120 VAC units shall have an attached input cord 6 feet (1.8 meters) in length, with a NEMA 5-15 plug. 

1.3.3.2	AC Output

A.	Voltage Configuration: 
120 VAC units:  120 VAC, 60/50 Hz, single-phase, 2-wire-plus-ground.
120 VAC, ± 7 VAC (Battery mode operation)
B.	Voltage Regulation: ±7% steady state.
C.	Frequency Regulation: Same as utility / mains in normal mode operation,  + 0.5 Hz while in battery mode operation.
D.	Load Power Factor Range: 0.5 lagging to 1.0 (unity).
E.	Inverter Overload Capability: 
120 VAC Models (Utility Mode) 
Units are capable of operating until the input circuit breaker on the UPS trips.  The fault LED is lit and audible alarm beeps 2 times per second. 

120 VAC Models (Battery Mode) 
Units are capable of up to 110% overload for 10 seconds with visual and audible alarms present. With 120% load applied the UPS will shut down immediately, with audible fault alarm. 

G. 	Transient Recovery Time: To within ±8% of nominal voltage in < 2 cycles.
H. 	Efficiency: > 97% (Normal mode), > 80% (Battery mode)

1.4	ENVIRONMENTAL CONDITIONS
A. Ambient Temperature
Operating: 
32 - 104°F (0 - 40°C) for altitudes 0 - 4,921 ft. (0 - 1500 meters) above sea level, no derating
32 - 86°F (0 - 30°C) for altitudes 4,922 - 10,000 ft. (1500.5 - 3000 meters) above sea level, no derating

77o F (25oC) for optimum battery performance

Storage: 
5 - 113°F (-15 to 45°C) with batteries for altitudes 0 - 49,210 ft. (0 - 15000 meters) above sea level

68oF (20oC) for optimum battery storage and battery shelf life

B. Relative Humidity:  0 - 95% non-condensing

C. Altitude: 10,000 ft. (3,000 m) maximum without power derating when operated within the temperature specified in section 1.4.A.  Ambient temperature shall need to be reduced 41°F (5°C) for each additional 1640 ft. (500 m) above 10,000 ft. to avoid power derating.
D. Audible Noise
Noise generated by the UPS during normal operation and battery mode shall be < 40dBA, when measured at 1 meter from any surface of the UPS. 
E. Electrostatic Discharge
The 120 VAC units are able to withstand an electrostatic discharge compliant to EN61000-4-2, level 4, Criteria A, without damage and without affecting the connected load. 

1.5	USER Accessories and Packaging 
The specified UPS system shall be supplied with a printed Quick-Start guide/manual and wall mounting template. The manual includes drawings and instructions, a functional description of the equipment, safety precautions, illustrations, operating procedures, and general maintenance guidelines.  The UPS shall also be supplied with a CD containing the electronic copy of the user manual, Liebert MultiLink Shutdown software, (1) USB cable (6-ft; 1.8m).  The 660-850VA models shall also include (1) Coax cable (3-ft; 1m).  The packaging meets the requirements of ISTA Procedure 1A.

1.6	WARRANTY
The manufacturer warrants the UPS against defects in materials and workmanship for three (3) years.  The warranty covers all parts.  An optional one (1) or three (3) year extended warranty is available from the manufacturer.
The user shall not have to pay freight or provide a credit card number for the manufacturer’s standard warranty support.  The manufacturer shall cover any freight to ship the replacement unit (next day freight) and shall provide a return call tag to cover freight to have the original unit returned to the manufacturer.  

1.7	QUALITY ASSURANCE
1.7.1	Manufacturer Qualifications
The manufacturer shall have more than forty-five (45) years’ experience in the design, manufacture, and testing of solid-state UPS systems and the company shall be certified to ISO 9001.

1.7.2	Factory Testing
Before shipment, each product shall be tested to assure compliance with the specification.  

2.0	PRODUCT
2.1	FABRICATION
All materials and components making up the UPS are new, of current manufacture, and have not been in prior service except as required during factory testing. All relays are provided with dust covers.
2.1.2	Wiring
Wiring practices, materials, and coding are in accordance with the requirements of the standards listed in section 1.2.  All wiring is copper.

2.1.3	Cabinet
The UPS unit comprised of: TVSS & EMI/RFI Filters, Battery Charger, Inverter, Automatic Voltage Regulator and Battery consisting of the appropriate number of sealed battery cells; is housed in a mini-tower NEMA type 1 enclosure with IP20 protection.  The UPS cabinet shall be injection-molded in the manufacture’s standard color.  Dimensions and weights shall be:

120 VAC MODEL	UNIT DIMENSIONS
W x D x H in (mm)	UNIT WEIGHT
Lbs (kg)	
350VA	11.97 x 4.84 x 3.35 (304 x 123 x 85)	6.4 (2.9)	
500VA	11.97 x 4.84 x 3.35 (304 x 123 x 85)	7.1 (3.2)	
660VA	12.4 x 7.2 x 3.3 (314 x 183 x 83)	9.4 (4.3)	
850VA	12.4 x 7.2 x 3.3 (314 x 183 x 83)	9.7 (4.4)	

120 VAC MODEL	SHIPPING DIMENSIONS
W x D x H in (mm)	SHIPPING WEIGHT
Lbs (kg)	
350VA	8.6 x 15.0 x 6.3 (218 x 380 x 160)	7.3 (3.3)	
500VA	8.6 x 15.0 x 6.3 (218 x 380 x 160)	7.9 (3.6)	
660VA	10.3 x 14.7 x 6.1 (261 x 373 x 155)	10.6 (4.8)	
850VA	10.3 x 14.7 x 6.1 (261 x 373 x 155)	11.0 (5.0)	

2.1.4	Cooling
The UPS shall be convection cooled.

2.2	COMPONENTS and operation
2.2.1	Input Protection
The UPS has built-in protection against under voltage, over current, and over voltage conditions including low-energy lightning surges introduced on the primary input power source. The UPS shall be provided with an input circuit protector. 
2.2.2	Converters

2.2.2.1 Inverter
The inverter incorporates solid-state devices and control circuitry to convert DC power from the battery.  The inverter shall use IGBT devices and shall utilize a pulse width modulated (PWM) design to provide regulated and conditioned simulated-sine wave AC power for supporting the critical load.  

2.2.2.2	Battery Charger
	The battery charger shall be provided to convert AC power to regulated DC power for battery charging. The UPS contains a battery recharge rate designed to prolong battery life.  The battery is constant voltage charged to recharge and maintain the battery in a fully charged state.  Recharge time is 8 hours to 90% rated capacity after discharge into full resistive load.  The battery charger shall begin to charge batteries once the UPS is connected to an AC source that is within the input specifications defined in section 1.3.3.1.A of this specification whether the UPS is ON or OFF.

2.2.2.3	DC Protection
The following DC shutdown levels protect the UPS:
DC Over voltage Shutdown
DC Under voltage Shutdown (End of Discharge)
DC Under voltage Warning (Low Battery Reserve)

2.2.2.4	Output Protection
For output faults including short circuits and overloads, the UPS is protected by the input circuit protector during Normal mode operation and by electronic current limiting during Battery mode operation.

2.2.2.5	Overload
The UPS is capable of supplying power for overloads exceeding 100% until the UPS input circuit breaker trips.  A visual indicator and audible alarm indicate overload operation.  For greater current demands > 120%, the UPS employs circuit protector and electronic current-limiting protection to prevent damage to components. 

2.2.2.6	Output Frequency
An oscillator controls the output frequency of the UPS.  The oscillator maintains the output frequency to + 0.5 Hz of nominal when operating from battery power

2.2.2.7	Battery Over-Discharge Protection
To prevent battery damage due to excessive discharge levels, the UPS control logic automatically monitors the battery voltage and switches off the output at the predetermined battery shutdown voltage set point.

2.2.3	Display and Controls
2.2.3.1	General
The UPS is provided with a microprocessor-based unit status and control display designed for convenient and reliable user operation.  The status and alarm indicators are displayed on a status indicator display

2.2.3.2	System Indicators
There shall be two (2) LED status indicators on the top of the 350-500VA UPS models (Utility and Fault) and an LCD display on the top of the 660-850VA UPS models.

350-500VA models:
The (green) Utility LED Indicator illuminates when the UPS is operating and supplying power to connected loads: 
•	Solid green indicates Normal mode
•	Blinking green indicates Battery mode operation and the audible alarm sounds every 5 seconds to indicate the UPS is operating on battery.

The (red) Fault LED Indicator illuminates when the UPS detects a problem. 
•	Solid red and constant audible alarm indicates a UPS fault. 
•	Blinking red with an audible alarm sounds twice every 5 seconds to indicate low battery with green LED still blinking.  
•	Blinking red with an audible alarm of 3 beeps every 30 seconds indicates that a battery replacement is required.  

660-850VA models:
The LCD shall provide numerical values of the input voltage and frequency, output voltage and frequency, output watts and amperage, and the estimated battery time remaining.  There shall also be a load capacity bar / battery capacity bar that display in 20% increments.

2.2.3.3	On/Off Controls
UPS start-up and shutdown operations are accomplished by the "On/Off" push button located on the front panel of the UPS.  Depressing the button for more than 2 seconds will start-up the UPS and to turn the UPS off the button will need to be depressed for 2 seconds.

2.2.3.4	Scroll and Alarm Silence (660-850VA Models Only)
The scroll button shall allow the user to navigate through the numerical parameters on the LCD display.  The Scroll button shall also allow the user to silence the audible alarm when unit in battery mode except when operating in overload/low battery/fault condition.  

2.2.4	Internal Battery
Valve regulated, non-spillable, lead-acid (VRLA) cells are used as a stored-energy source for the specified UPS system. The battery is housed internal to the UPS cabinet, and sized to support the inverter at full rated load, with ambient temperature of 77 o F (25 o C) for a minimum of 2 minutes reserve time.  The expected life of the battery shall be 3 - 5 years or 250 complete discharge cycles.

2.2.5	Output Distribution
Output distribution is integral to the UPS and is located on the rear of the unit.  

350-500VA models shall have (3) NEMA 5-15 receptacles that are surge and battery protected and also have (3) NEMA 5-15 receptacles that are surge protected only.

660-850VA models shall have (4) NEMA 5-15 receptacles that are surge and battery protected and also have (4) NEMA 5-15 receptacles that are surge protected only.

2.2.6	Communications – USB Interface Port
The UPS shall have (1) USB Interface Port. The USB connector shall be a RJ45 connector. The USB interface port shall always be active. The UPS shall be capable of communicating system status and system shutdown via the USB. Hardware shall support and allow operating system communication for Windows 98 and newer. USB port shall be capable of communicating via Liebert MultiLink Shutdown software, which is provided.   The UPS shall also be provided with a 6 ft. (1.8m) USB cable that is USB Type A to RJ45 for connection between the UPS and a computer

2.2.7	Surge Protection – Telephone / Network
The UPS shall have built in surge protection for telephone or computer network connection. The UPS shall contain (2) RJ45 connectors to allow either RJ11 (telephone) or RJ45 (network) cables. The UPS shall be capable of proper operation whether this feature is used or not.

2.2.8	Surge Protection – Coax Cable (660-850VA Models Only)
The UPS shall have built in surge protection for cable modem, DSS receiver or cable TV converter box connection. The UPS shall contain (2) Coax Cable connectors and shall include (1) 3 ft. (1m) RJ59/U (75 Ohm) coax cable. The UPS shall be capable of proper operation whether this feature is used or not.