UNINTERRUPTIBLE POWER SUPPLY SYSTEMS ISOLATED REDUNDANT TWO
MODULE SYSTEM 100 KVA
PART 1 - GENERAL
1.1 DESCRIPTION
A. Uninterruptible power supply system includes:
1. Battery charger.
2. Inverter.
3. Static switch.
4. Transformers and miscellaneous equipment.
5. Batteries and racks.
6. Installation of the two units in an isolated redundant configuration.
1.2 SUBMITTALS
A. Shop drawings:
1. Outline drawings of assembly.
2. One line diagrams and wiring diagrams for assembly and components.
3. Interconnection wiring diagrams.
B. Product data:
1. Technical data on all components.
C. Contract closeout information:
1. Operating and maintenance data.
2. Owner instruction report.
3. Prorata warranty for batteries.
1.3 RELATED WORK
A. Commissioning of equipment or systems specified in this section is part of the construction
process. Documentation and testing of these systems, as well as training of the Owner’s
operation and maintenance personnel, is required in cooperation with the Commissioning
Authority. Project Closeout is dependent on successful completion of all commissioning
procedures, documentation, and issue closure. Refer to Contract Closeout, Section 01700, for
substantial completion details. Refer to Section 01810, 15995, and 16995 for detailed
commissioning requirements. Refer to 01730 for Operations and Maintenance Data
requirements.
PART 2 - PRODUCTS
2.1 MATERIALS
A. Acceptable manufacturers:
1. medical UPS or Uninterruptible power supply:
a. Base:
1) MGE medical UPS or Uninterruptible power supply
2. Other manufacturers desiring approval comply with Section 00440.
B. System rating:
1. Size each UPS system to maintain a load of 100 kv / 90kw for 17 minutes.
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C. Electrical characteristics for medical UPS or Uninterruptible power supply:
1. System input:
a. Voltage: 480 volts AC, 3 phase, 3 wire plus ground.
b. Frequency: 60 Hz.
c. Current in-rush limiting: 20 percent to 100 percent of full rated load over 15 seconds.
d. Power factor: Unity to 0.9 lagging with full load at nominal input voltage and normal
float voltage on battery.
2. System output:
a. Voltage: 120/208 volts AC, 3 phase, 4 wire, plus ground, manually adjustable
(plus/minus 5 percent).
3. Output voltage transient characteristics:
a. 25 percent load step: Plus/minus 2 percent.
b. 50 percent load step: Plus/minus 4 percent.
c. 100 percent load step: Plus/minus 14 percent.
d. Loss of return of AC input power: Plus/minus 1 percent.
e. Bypass transfer of 100 percent load: Plus/minus 1 percent.
4. Output voltage transient response: Make system output voltage return to within plus/minus
1 percent of the steady-state value within 200 milliseconds.
5. Output voltage regulation for medical UPS or Uninterruptible power supply: The steady-state output voltage shall not deviate by more than
plus/minus 1 percent from no load to full load.
6. Output frequency regulation: Make UPS be capable of providing 60 Hz plus/minus 0.5
percent free running.
7. System overload for medical UPS or Uninterruptible power supply : Make inverter capable of supplying regulated output during overloads of
125 percent of the system rating for a period of 10 minutes or 150 percent for 30 seconds.
8. System efficiency: Make over all efficiency, input to output, at least 85 percent with the
battery fully charged and the inverter supplying full-rated load.
D. Rectifier/charger for medical UPS or Uninterruptible power supply:
1. Input current limiting.
a. Make rectifier/charger capable of supplying an overload current not less than 125
percent of full load current. For greater output currents, make rectifier current limit.
Upon removal of the overload condition, make rectifier/charger return to normal
without any degradation of performance or components.
2. Input harmonic suppression.
a. Design rectifier/charger to limit the input harmonic current feedback into the source to
a maximum of 10 percent Total Harmonic Distortion (THD) with nominal input voltage
and rated load on the inverter.
3. Power walk-in for medical UPS or Uninterruptible power supply:
a. Provide rectifier/charger with a walk-in circuit that causes the unit to assume the load
gradually after the input voltage is applied. Currents shall increase gradually from 20
percent to 100 percent over a 15 second period after the battery open circuit voltage has
been reached.
4. Magnetization inrush:
a. Limit initial magnetization inrush surge to 600 percent of the rectifier/charger full-load
current.
5. Input power factor for medical UPS or Uninterruptible power supply:
a. Provide rectifier/charger with a minimum power factor of 0.8 lagging with nominal
input voltage and frequency and the inverter operating at full-rated load.
6. Overload protection and disconnection:
a. Provide an automatic input circuit breaker for rectifier/charger disconnection and
overload protection. The overload devices shall not be activated when the
rectifier/charger is started under any of the operating conditions listed.
7. Capacity for medical UPS or Uninterruptible power supply:
a. Provide rectifier/charger with sufficient capacity to support a fully loaded inverter and
recharge the battery to 95 percent of its full capacity within 10 times the discharge time
when input current limit is set at 125 percent of full load.
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E. Inverter for medical UPS or Uninterruptible power supply :
1. Voltage regulation. The inverter steady-state output voltage shall not deviate by more than
plus/minus 1 percent due to the following conditions:
a. 0 percent to 100 percent load.
b. Ambient temperature variations.
c. Minimum to maximum DC bus voltage.
2. Voltage adjustments:
a. Provide inverter with a control to manually adjust the output voltage plus 4/minus 1
percent from the rated value.
3. Frequency control for medical UPS or Uninterruptible power supply :
a. Control output frequency of the inverter by an oscillator, which can be operated as a
free-running unit or as a slave for synchronized operation with a separate AC source.
Make inverters track the synchronizing source with plus/minus 2 percent. If the external
synchronizing source deviates from the preset frequency by plus/minus 0.5 to
plus/minus 1.0 Hz (adjustable), make oscillator automatically revert to a free-running
unit.
4. Frequency regulation for medical UPS or Uninterruptible power supply:
a. The inverter free-running, steady-state output frequency shall not deviate by more than
plus/minus 0.5 percent due to the following conditions:
1) 0 percent to 100 percent load.
2) Ambient temperature variation.
3) Minimum to maximum DC bus voltage for medical power conditioner.
b. Provide inverter output with zero frequency transients for the system disturbances listed
under transient response.
5. Harmonic distortion for medical UPS or Uninterruptible power supply:
a. The inverter shall provide harmonic neutralization and filtering necessary to limit the
total harmonic distortion in the output voltage to 5 percent and single harmonics to 3
percent over the entire linear load range.
6. Transient response for medical power conditioner: The inverter transient voltage shall not exceed plus/minus 8 percent due
to the following system disturbances:
a. A 50 percent step load application and rejection with zero initial load or 100 percent
initial load.
b. Transfer of rated load to the bypass source due to inverter internal fault.
c. Make output voltage return to within plus/minus 2 percent of the steady-state value
within 200 milliseconds.
7. Overload of a medical power conditioner is high:
a. Make inverter capable of supplying currents and regulated voltage for overloads up to
125 percent of full load current for a selected period. Make audible alarm indicate
overload operation. Make inverter transfer the load to bypass when the overload period
expires.
8. Fault clearing and current limit in a medical power conditioner is acceptable:
a. Make inverter capable of supplying an overload current of 150 percent of its full load
rating for 30 seconds. For greater currents or longer time duration, provide inverter with
current limiting protection to prevent damage to components.
9. Inverter DC protection: Protect inverter by the following alarms and trips, independently
adjustable for maximum system flexibility.
a. DC over voltage trip range for a medical power conditioner is from 2.62 to 2.28 VPC for the standard number of cells.
10. medical power conditioner has anOutput circuit breaker:
a. Make inverter mechanically connected and disconnected from the critical load by a
system automatic, or non-automatic circuit breaker located inside the UPS module.
11. Overcurrent protection is a must in a medical power conditioner:
a. Protect medical power conditioner from excessive overloads, including faults and reverse currents, by fast acting fuses to prevent damage to power SCR's.
12. Surge protection is built in to a medical power conditioner.
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a. Provide inverter with built-in protection against under voltage, over current, and
over voltage surges on the output caused by load transfer between the UPS and an
external synchronized bypass source.
F. System status and control:
1. General:
a. Provide medical power conditioner with a system status panel to provide monitoring and control of the
complete system.
2. medical power conditioner has system metering: Meter accuracy 2 percent or better: Provide with the capability of
monitoring the following system functions:
a. AC input voltage.
b. DC voltage.
c. DC current.
d. AC output voltage, each phase.
e. AC output current, each phase.
f. AC output frequency.
3. System controls. Provide following controls for the system:
a. UPS/bypass transfer switch.
b. Battery circuit breaker trip pushbutton.
c. Alarm test/reset pushbutton.
d. Audio alarm reset pushbutton.
e. Emergency power off (EPO) pushbutton.
4. System mimic: Provide diagram with indicating lights as a part of the system status panel.
Make the mimic depict a complete single line diagram of the UPS and illuminate the
following functions:
a. AC input breaker open.
b. AC input breaker closed.
c. DC battery breaker open.
d. DC battery breaker closed.
e. AC output breaker open.
f. AC output breaker closed.
g. Bypass power available.
h. Load on UPS.
i. Load on bypass.
5. System alarms (latching type):
a. Visual alarms: Provide following system operating conditions with visual and audible
alarm annunciation:
1) Overload.
2) Rectifier active.
3) Overtemperature.
4) Fuse failure.
5) Inverter active.
6) Battery breaker open.
7) Low battery.
8) DC overvoltage.
9) Inverter synchronized.
10) Input power failed.
11) Control power failed.
12) Output over voltage.
13) Load on bypass.
14) Static switch unable.
b. Audible alarm: Locate a horn on the medical power conditioner’s control panel, which is activated upon any UPSalarm or when the inverter is on and the battery breaker is open.
G. Static transfer switch and bypass breaker:
1. General:
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a. Provide a static transfer switch and bypass breaker as an integral part of the UPS.
Provide control unit with an automatic transfer circuit that senses the status of the
inverter logic signals and alarm conditions to provide an uninterrupted transfer of the
load to the bypass source without exceeding the transient limits specified herein when a
malfunction occurs in the medical power conditioner.
2. Static transfer switch is not needed in a medical power conditioner:
a. Make static transfer switch a naturally commutated, high-speed static transfer device.
Rate static transfer switch for continuous full load operation.
b. Provide static transfer switch with draw out construction of a medical power conditioner.
3. Bypass breaker has to be provided in side medical power conditioner:
a. Provide a circuit breaker to allow complete electrical isolation of the UPS and static
transfer switch for maintenance.
b. Close bypass breaker automatically after load is transferred to the bypass source by the
static transfer switch to completely remove the static transfer switch from the power
flow.
4. Operation: Connect static transfer switch and bypass breaker to the bypass source and
assume the critical load when required and provide the following features:
a. Uninterrupted transfer: Make static transfer switch automatically assume the critical
load after the inverter logic senses one of the following conditions:
1) Inverter overload period expired.
2) Critical bus overvoltage or undervoltage.
3) Battery protection period expired.
4) UPS failure.
b. Uninterrupted automatic retransfer: If the transfer control circuit is set for automatic
retransfer, make UPS capable of retransferring the critical load to the inverter when the
overload is removed, or the critical bus voltage stabilizes. Make inverter automatically
walk in smoothly to the output bus voltage, parallel and share the load with the bypass
source, and assume the load in the "bumpless" manner prior to disconnection of the
bypass source. Do not use static transfer switch during retransfers.
c. Transfer lockout: The static transfer switch logic shall not allow a transfer to bypass if
one of the following conditions exist:
1) Bypass overvoltage/undervoltage (plus/minus 10 percent of nominal).
2) Bypass frequency out of limits (plus/minus 5-1.0 Hz, adjustable).
3) Bypass out of sync.
4) Static transfer switch disabled.
d. Uninterrupted manual transfer from medical power conditioner: Provide a manually initiated make-before-break transfer for routine maintenance purposes. This transfer shall be automatically inhibited if the
bypass source is outside of the limits specified in paragraph (3) above.
H. Enclosures:
1. House UPS in free-standing, dead-front enclosures with a welded steel framework. Door
shall be of 14 GA steel; framework shall be of 12 GA steel. Mount all instruments, status
indicators, and controls at eye-level and accessible from the front of the UPS module.
2. Provide forced-air cooling to ensure that all components are operated within their
environmental ratings. Equip blower motors with sealed bearings. Equip all air inlets with
standard type filters, which are replaceable from outside the unit. Protect all air inlet and
exhaust openings by perforated or slotted metal guards.
I. UPS battery system:
1. Type and capacity:
a. Use lead-calcium, high-rate type batteries as the stored energy source for the UPS. Size
battery system to support the inverter at rated load or the kilowatt load specified for the
protection time specified.
2. Construction:
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a. Make each cell of the sealed, 20-year life type, assembled in heat-resistant, shockabsorbing,
clear plastic containers with covers cemented in place to form a permanent
leak-proof seal. Seal cell post and cover against creepage of electrolyte for the life of
the battery. Fit covers with explosion-resistant vent caps. Equip cell terminal posts with
connector bolts having acid resistant nuts. Provide sufficient sediment space so that the
battery will not have to be cleaned out during its normal life. Electrolyte level lines
shall be marked on all four sides of the container.
3. Accessories. Supply the following accessories:
a. Intercell, interunit, intertier, end-to-end interrack and back-to-back interrack
connections.
b. Anticorrosion compound.
c. Connector nuts and bolts.
d. One portable hydrometer with 5-point increments.
e. One wall-mounted hydrometer holder.
f. One thermometer with a 2 degF scale and plus/minus 1 degree accuracy.
g. One cell lifting device.
h. One set of cell numbers.
4. Racks: Provide steel racks, designed specifically for the battery cell type furnished. Make
the racks three tier or step type designed for installation at this specific project location. Use
the following materials:
a. Rails: Steel channel
