Acme Piu

POWER INTERFACE
UNIT (PIU)
ACME's PATENTED POWER INTERFACE UNIT (PIU) is an ideal solution for telecom sites in areas having wide
fluctuations and surges in the mains supply. PIU system houses all electrical equipment required in the
shelter within a rack space of 600mm x 400mm and offers an efficiency better than 97%.
ACME developed the PIU system on thyristor-based technology having true RMS measurement and monitoring
capability. Thus, poor AC mains is no more a problem as it offers wide input mains range and even diminishes the
use of the diesel generator due to unhealthy mains.
Benefits
Maximum mains power utilisation
Saving in space and materials installation
In-built lightning and surge protection
Input-output galvanic isolation and high voltage/low voltage protection
Modularity in line conditioner unit to ensure regulated output using static switches
Enhancing reliability of operation and improved MTBF
Better M2M interface through menu driven panel
GSM modem-based storage and transfer of performance data, remote monitoring/and
history tracking
Easy analysis and maintenance management
Plug & play, quick installation to meet the stringent rollouts
Major components of PIU system are:
Static Line Conditioner Unit (LCU) protects electrical & electronic equipment from
input power supply surges at speeds of 30 msec to 10 msec. It protects sensitive
equipment and instruments from start up line voltage drops (say when an Air Conditioner
or motor starts). It conditions an input voltage with a variance of 50% to an output
voltage with a variance of 10% ( 1% optional for sensitive instruments).
Auto Mains Failure (AMF) system for automatic changeover to Diesel Generator (DG).
The system starts and runs the DG set and continually monitors all parameters such as oil
pressure, air filter clog, low fuel and high temperature in order to maintain the health of
the DG set.
Switch Mode Power Supply (SMPS) maintains critical operation power input by
alternating automatically between the Mains, DG or Battery Banks at efficiencies of 95%
(generally available: 90% and less).
Battery Management System (BMS) monitors and controls the charging rate for
enhancing the life of batteries by regulating battery heat. It also monitors health of the
cells and creates an automatic log of all parameters.
AC distribution, fire alarm, safety & security, alarm extension and GPRS-based network
management system are an integral part of ACME's PIU system.
PIUs available in a broad range of power ratings to accommodate all requirements

Sl No.
2A
3A
Basic PIU
5
7.5
7.5
12.5
12.5
15
Rating in kVA
upgradable
upgradable
upgradable
4A
10
11
15
20
25
30
37.5
45
50
62.5
Leading Through Innovation
Preempting critical power

needs with reliable edge
Technical Specifications*
Description
I - Structure
Capacity
Mechanical
Thickness
IP Protection
Tests
Standard Specification
Description
Standard Specification
IV - Protections
15 KVA (Range - 5 KVA to 50 KVA) wide input range
19 CNC fabricated rack, using CRC sheet duly powder
coated with white & blue size 19 duly 1800(H) x 600(W) x
400(D)mm
1.66 mm CRC sheet is used
Input
Voltage protection
levels - 2 at input
Voltage protection
4-POLE 160AMP MCCBs

High Voltage Disconnect (HVD) 485V after
10 milliseconds
Low Voltage Disconnect (LVD) 110V after 5 seconds
Input HVD 485V; LVD 110V
IP 21, suitable for indoor use

Designed to comply EMI/RFI as per FCC class-A. Burst
test as per IEC 62.41 and environmental test as per
TEC QM-333, category B2
Designed as per IEC 60950 safety standards
CE Certified
More than 70,000 Hrs.
levels-2 at LCU
Output HVD 250V (immediate); LVD 190V after 3 sec
Insulation
>1000 megaohms
Safety
Compliance
MTBF
II - Central processing unit
Micro controller
High-Speed micro controller, true RMS for all voltage &
current, all the inputs to the measurement board is duly
protected against surge as per IEEE-62.41. The
measurement circuit is rated at least twice of the
maximum input range, each independent for AMF & LCU
Time
Real time & date-programmable
Event logs
Last 500 events
RS 232 Port
For PC interface to adjust the critical data and unload
the alarms. This port is used for configuration of
PFCs. Data is extended through RS 232 port.
Data Transfer:
PIU is equipped with suitable GPRS Modem/GPRS DTU
and able to process the data
It is able to connect via RS 232 Port to power plants for
energy meter reading or with any other specific equipment.
Energy
Able to measure the Mains, DG and DC Channel Energy.
Digital spare inputs
16 Digital inputs for system management (optional)
Network management
Central management system with MIS all
system
over India sites (Optional)
III - LCU with isolation transformer
Type
Micro controller based, true RMS, static line conditioner
Power rating
3 phase input, with auto phase selector (optional)
Rated input voltage range
110V to 485Vac L to L
Rated output voltage
220V +/- 10%
Input frequency range
47-53Hz
Total harmonic distortion
<3%
(THD)% of Voltage/Current
Input power factor at 100%
>0.95
load@415V i/p & 215Vo/p
Output load power
>0.95 (Load dependent)
factor at 100% load@
415V i/p & 215Vo/p
Efficiency at full load &
>97.5%
min/max i/p range
Dynamic response time
400V/us
Response time
<10ms
Inter winding capacitance <10nf

Input/Output isolation
6KV
Winding
Double wound with copper foil shielding
Inrush Current
144 Amp (Equal to Max full load Current)
Temperature
-50C to 550C
Lightening
Protection from multistrike lightening class B+C, 50KA,

as per IEC 61312-3
Humidity
RH 95%
V - Auto mains failure system

DG trip protection (safety with alarms)
Low lub oil (supply of LLOP not in scope), Low fuel level (sensor not in scope of ACME),
Over load (adjustable depending on diesel generator capacity) (>110%-factory
setting), Voltage protection. (a) HVD & LVD-+/-5V above/ below the range, HCT/HWT
Delays
DG on load after DG starts and supply healthy (30 Seconds), Blackout delay for 10
seconds between mains and DG contactor changeover - DG cooling time - 5 minutes,
Three attempt for DG start with delay between attempts (40-40-40 sec), DG lock time
after three very short mains restoration 10-10-20 minutes
Automatic SMPS Based CVCC for 12V/120AH DG Battery Charging
VI - Safety & security systems provided
VII - AC distribution unit & control (can be customised as per user
requirement)
AC distribution unit
Standard Configuration
Input Protection
Yes
MCCB/MCBs
Mains, DG, SMPS, Power point, Lighting, Aviation lamp,

Battery charger, Air conditioners
VIII - Miscellaneous
Real time based, Dry contact
Accessories
Aviation lamp controller, Surge arrester. (Class B+C), Auto

phase selector, Room temperature sensor
IX - Measuring system
Display Frequency Currents Voltage
DG set measurements
Mains/DG status, DG acccumulated hours, DG voltage
Mains measurements
Input voltage, Output voltages for LCU modules
LED indications
Mains ON, DG ON, Smoke/Fire alarm, Over load, LCU

Fail, Fuel Low, DG fail to start, DG fail to stop,
Alternator fail, LLOP, DG overload, Mains fail, system
battery low, DG battery low, HCT/HWT, High shelter
temperature, PIU Battery Low, Mains Fail.
List of potentional
free contacts
As per configuration
*Specifications subject to change

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POWER INTERFACE

Major components of PIU system are:

PIUs available in a broad range of power ratings to accommodate all requirements

Leading Through Innovation

Preempting critical power

4-POLE 160AMP MCCBs

IP 21, suitable for indoor use

Output HVD 250V (immediate); LVD 190V after 3 sec

Inter winding capacitance <10nf

Double wound with copper foil shielding

144 Amp (Equal to Max full load Current)

Protection from multistrike lightening class B+C, 50KA,

V - Auto mains failure system

Mains, DG, SMPS, Power point, Lighting, Aviation lamp,

Aviation lamp controller, Surge arrester. (Class B+C), Auto

Mains/DG status, DG acccumulated hours, DG voltage

Input voltage, Output voltages for LCU modules

Mains ON, DG ON, Smoke/Fire alarm, Over load, LCU

*Specifications subject to change

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