Model Number	LT Series
Brand Name	Controlled Power

Uninterruptible Power Systems (UPS)

LT SERIES – 700 VA to 2.1 kVA

GENERAL

The LT Series Uninterruptible Power System (UPS) is a single phase, continuous duty on line, single conversion UPS. It is designed to supply reliable, clean, regulated power for critical loads. An efficient ferroresonant transformer, microprocessor controlled, solid state PWM inverter and long lasting battery pack provide immunity to all line disturbances and power interruptions with no break in AC output power. The synchronous inverter produces a true uninterruptible output in any mode of operation. A self-diagnostic monitoring alarm systems keeps operators continuously advised of the system status.

CONSERVATIVE RATING

The LT Series is conservatively rated for non-linear loads with crest factors as high as 3.5 and power factors of 0.6. There is no need to over size for kVA requirements.

K-FACTOR

K-Factor rating of 30 or better. In addition, odd harmonic currents, which are generated by today’s typical switch mode power supplies, are attenuated by the UPS. This prevents overheating of building and wiring transformers.

ENVIRONMENTAL ADAPTIVE CONTROL

Soft utility and engine generators produce severe input voltage distortions that cause many UPS detection circuits to misjudge real power fluctuations. The LT Series eliminated this problem by capturing the input voltage waveform and using artificial intelligence to make detection decisions.

OPERATION

Under normal operation conditions, the critical load is supported through an on-line ferroresonant power purifier. The ferroresonant power purifier corrects for every power line disturbance except long term power outage. Also during normal operating conditions, a precision battery charger maintains a ripple free float charge on the batteries keeping them fully charges and ready. Upon failure of commercial AC power, DC battery power is converter to AC by a microprocessor controlled PWM inverter and further filtered through the on-line ferroresonant power purifier for the load. With this technology we are able to attain isolated, regulated, conditioned, uninterrupted output power with no break in output power during failure or restoration of commercial AC power. System reliability (MTBF) is proven to be in excess of 200,000 hours for the ferroresonant power purifier and 100,000 hours for the total system including batteries.

SYSTEM MONITORING AND ALARM PANEL

Digital, 3 digit, bright LED display provided to display the following system operating parameters:

Percent of battery capacity

Output voltage Percent of load

LED indicator lights and switch selectable audible alarms are provided to indicate the following system conditions:

System on (green)

System on battery (yellow)

Low battery warning (red) General alarm

Weak battery warning (yellow )

REALTIME UPS MONITORING

Realtime UPS monitoring is one of the industries most advanced tools for managing UPS operations. Operators can easily analyze vast amounts of important UPS and electrical utility line data. The UPS incorporates a multitasking microprocessor that controls the operation, processes data and makes the information available in an ASCII format through RS232 protocol at the UPS J1 communications port. The UPS can be programmed by the user for optimum performance and compatibility with actual site operating conditions.

Examine the system set points

This section allows the UPS’s programmable operating set points to be reviewed.

Sample of system set points Definition

Minimum AC Start = 177 Minimum AC voltage required for the UPS to start

Maximum AC Start = 229 Maximum AC voltage allowable for UPS start

Low output = 108 Alarm when UPS output voltage falls below this setting

High output = 128 Alarm when UPS output voltage exceeds this setting

Low battery (%) = 40 Low battery alarm when 4% of battery source remains

High battery (%) = 105 Alarm when battery voltage exceeds this setting

Low frequency = 59 Alarm when output frequency is less than this value

High frequency = 61 Alarm when output frequency is greater than this value

Over temperature = 180 Alarm when device temperature exceeds this level

Input nominal = 208 Input voltage center operating point

Output nominal = 120 Output voltage center operating point

Output kVA = 3.1 UPS maximum output rating

Sag switch point (%) = 85 Percentage of input nominal voltage when UPS will use
batteries. 00 for activation of Fuzzy Ranging.

Surge switch point (%) = 110 Percentage of nominal peak voltage when UPS will use batteries.

Sensitivity (1-2) = 1 Sensitivity to line voltage disturbances; 1= normal, 2 = increased

Frequency delay (2-9) = 8 Number of cycles out of band prior to transfer to inverter   mode.

Transfer delay seconds = 10 Upon return of AC power; number of seconds required
prior to accepting the utility power line

System ID = 00001170 ID and Serial number

Examine the system parameters

Sample of system parameters Definition

Input voltage = 208 Voltage applied to input of the UPS

Output voltage = 120 UPS output voltage to the load

Battery voltage (%) = 100 Percent of full battery charge

Output current = 15.5 Amperage the load draws from the UPS

Load percentage = 60 Percentage of total UPS output capacity that the load requires from the UPS

kW = 1.30 Total real power the UPS is delivering to the load

kVA = 1.86 Total apparent power the UPS is delivering to the load

Power factor = 0.70 The power factor the load represents to the UPS

Frequency = 60.0 Frequency of UPS output power to the load

Crest factor = 3.00 Crest factor of output current the load represents to the UPS (ratio of peak current to RMS current)

Number of outages = 9 Logs number of utility power line outages

Number of overloads = 0 Logs the number of overloads placed on the UPS

BATTERY

Controlled Power Company offers a wide range of factory pre-assembled and tested emergency battery options. The entire LT Series product line is available with self-contained (internally located) batteries. For longer emergency run times, externally located battery options are also available. All batteries are sealed, maintenance free and rated for a projected service life of 5, 8 or 10 years depending on the battery option choice.