The LTR 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.

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 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

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