Single Phase System Three Phase System
Model NSC ………………………………… Model NTC ………………………………… Input AC voltage …………. V +/- 10% Input AC voltage ………….. V +/- 10%
Input frequency 50 Hz or 60 Hz +/- 6% Input frequency 50 Hz or 60 Hz +/- 6%
UPS Power Solutions
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Marine / Offshore UPS System
Standard Rectifier Specification
Output
Rectifier output voltage 12V, 24V, 48V, 110V or 220V DC (nominal)
Float adjustment 80% to approx. 135% of V nominal
Boost/Hi-rate adjustment 80% to approx. 135% of V nominal
Output characteristic Constant voltage / current ( I/U as per DIN 41773)
Output voltage Stability Static +/- 1% with 10 – 100% load variation, input voltage of +/-
10% and input frequency of +/- 6%
Dynamic +/- 5% with 10 – 100% load variation. Recovery time to
static within typically 200 ms.
Current regulation < +/- 2% to I max.
Ripple filter < 2% Vr.m.s. with battery connected ( Bat. ≥ 5 x In )
RFI / EMC G according to VDE 0875 / EN 50081-2
Indications Rectifier On, Float and Boost LEDs
Environment
Operating temperature -10° to +40° C derate from 40° C to 55° C by lowering the
output current with 1.25% per ° C
Storage temperature -25° C to +70° C
Altitude Up to 1000m, derate from 1000 m to 5000 m by lowering the
output current with 6.7% per 1000 m.
Relative humidity operation from 0 – 95% (non- condensing )
Acoustic noise typically 45 – 65 dB(A)
Protection
Rectifier input Soft start function and Surge suppressor
Rectifier output protected against short circuit
Battery output polarity reversal of battery
Current limiting 105% of rated current
Rectifier Control
Rectifier input Input fuse / switch
Rectifier output DC output fuse
Battery Battery dc fuse
Charge mode Float/Auto/manual boost switch
Indication LED test button
Alarm Standard with manually reset button
Magnetic
High voltage insulation 2 KV AC for 1 minute between input / output and electrical earth
Insulation resistance 10 MOhms with 500VDC between input/output and electrical
Earth
Mechanical
Paint finish Epoxy powder coat with chemical rust resisting primer
Colour RAL 7032, Light Grey
Degree of protection IP 20 according to IEC 60529
Surge Protection Solutions
UPS / Surge protection solutions
Surge protectors or UPSs can safeguard your computer system. Using both a surge protector and a UPS helps guard against less serious power surges, and both a surge protector and UPS provide additional AC sockets for your rapidly PC growing system.
The UPS is the better choice because of the following reasons:
- Safety nets: A UPS provides a number of extra minutes of AC power if your home or office experiences a power failure — generally enough so that you can close any documents you’re working on and then shut down your PC normally.
- Auto shutdowns: More expensive UPS models can shut down your PC automatically in case of a power failure.
- Current cleaners: Most UPS units filter the AC current to smooth out brownouts and noise interference from other electronic devices.
- Audible alerts: Some UPS units sound an alarm whenever a power failure or significant brownout occurs.
Earthing & Grounding Solutions
Earthing, Bonding and Grounding solutions
The principal purposes for an “effectively bonded grounding system via a low impedance path to earth” are to provide for the following:
- Provide for an applicable reference to earth to stabilize the system voltage of a power distribution system during normal operations.
- Create a very low impedance path for ground-fault current to flow in a relatively controlled path.
- Create a very low impedance path for ground fault current flow in order for overcurrent protective devices and any ground fault protection systems to operate effectively and satisfactorily as designed and intended.
- Limit differences of potential, potential rise, or step gradients between equipment and personnel, personnel and earth, equipment and earth, or equipment to equipment.
- Limit voltage rise or potential differences imposed on a power distribution system from lightning, a surge event, any phase-to-ground fault conditions, or the inadvertent commingling of or the unintentional contact with different voltage system
ARA UPS Alarm Distribution Unit
FUNCTION
- Alarm relay contact to monitoring system
- Alarm to audible & visible
– Earth fault
– Auto by-pass
– On battery mode(AC fault)
– Battery low
– Any UPS fault - Manual by-pass for UPS maintenance
- Automatic by-pass
- Remote ON/OFF & RPO(Remote Power Off) Control
- Output feeder terminal
- Auto sources change Main & Emergency power
■ DNV – Pt.4 Ch.8 Sec.7
▶ For power supply units with batteries included, the following additional alarms shall be provided:
● When the charging of a battery fails, alternatively if the battery is being discharged
● When the automatic bypass is in operation for on-line units
● Operation of battery protective device
■ ABS – 9.17.4(e)
▶ Monitoring and Alarming. The battery charger unit or uninterruptible power system (UPS) unit is to be monitored and an audible and visual alarm is to be given in a normally.
▶ Attended location for the following:
● Power supply failure (voltage and frequency) to the connected load
● Earth fault
● Operation of battery protective device
● When the battery is being discharged
● When the bypass is in operation for on-line UPS units.
● When changeover occurs for battery charger units and DC UPS units required to comply with 4-3-2/7.1.6(c).
■ Lloyd’s Register – 9.3.5 / 9.3.6
▶ An external bypass, that is hardwired and manually operated, is to be provided for UPS to allow isolation of UPS for safety during maintenance and maintain continuity of load power.
▶ UPS units are to be monitored and an audible and visual alarm is to be initiated in the navigating bridge or the engine control room, or an equivalent attended location for:
● Power supply failure (voltage and frequency) to the connected load
● Earth fault
● Operation of battery protective device
● Battery discharge
● Bypass in operation for on-line UPS units.
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