Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
readout to indicate setting level. The voltage regulation system
shall include provisions for reactive load sharing and electronic
voltage matching for paralleling applications. Motorized voltage
adjust pot is not acceptable for voltage matching.
Controls shall be provided to monitor the output current of the
generator set and initiate an alarm when load current exceeds
110% of the rated current of the generator set on any phase for
more than 60 seconds. The controls shall shut down and lock out
the generator set when output current level approaches the thermal
damage point of the alternator.
Controls shall be provided to monitor the KW load on the
generator set, and initiate an alarm condition when total load on the
generator set exceeds the generator set rating for in excess of 5
seconds.
Controls shall include a load-shed control; to operate a set of dry
contacts (for use in shedding customer load devices) when the
generator set is overloaded.
An AC over/under voltage monitoring system, which responds
only to true RMS voltage conditions, shall be provided. The
system shall initiate shutdown of the generator set when alternator
output voltage exceeds 110% of the operator-set voltage level for
more than 10 seconds, or with no intentional delay when voltage
exceeds 130%. Under voltage shutdown shall occur when the
output voltage of the alternator is less than 85% for more than 10
seconds.
A battery monitoring system shall be provided which initiates
alarms when the DC control and starting voltage is less than
25VDC or more than 32 VDC. During engine starting, the low
voltage limit shall be disabled, and if DC voltage drops to less than
14.4 volts for more than two seconds a "weak battery" alarm shall
be initiated.
When required by National Electrical Code or indicated on project
drawings, the control system shall include a ground fault-
monitoring relay. The relay shall be adjustable from 100-1200
amps, and include adjustable time delay of 0-1.0 seconds. The
relay shall be for indication only, and not trip or shut down the
generator set. Note bonding and grounding requirements for the
generator set, and provide relay which will function correctly in
system as installed.