engine / genset control auto transfert switch
MNS
Auto transfert
switch unit
• Simple and effective unit
• 3 phase mains voltage monitoring
• Adjustable voltage with potentiometer
• Remote start output
The MNS is a basic, micropro- A SIMPLE PRODUCT FOR BASIC APPLICATIONS
cessor controlled unit designed The functions have been reduced to the minimum. The front panel mimic dia-
gram provides information about the mains and generator power availability
to monitor 3-phase mains
as well as contactor positions.
voltages, send remote start The MNS continuously monitors the AC mains phase voltages. If at least one of
commands to the generating the phase voltages goes outside set limits, it triggers a transfer cycle.
set, and manage changeover
of both the generator and the SPECIAL TEST MODE FUNCTION
mains contactors. The MNS provides a TEST mode pushbutton allowing the genset to be tested
without a mains failure. The Test mode is also called the Emergency Backup
The genset should be controlled mode which keeps the genset running and makes a quick transfer in the event
of a mains failure.
by a Remote Start control unit.
HIGH COMPATIBILITY AND FLEXIBILITY
Because of the simplicity of its connections, the MNS may be used with most
commercially available or custom built engine control systems.
The lower limit of the mains and genset voltages may be manually adjusted via
the potentiometer found on the left hand side of the unit. The upper voltage
limit is factory set.
The unit uses two part connectors for easy replacement
RELIABLE AND EASY TO USE
The MNS is dedicated to basic applications which require no extra costs or
expensive hardware.
All CRE Technology products aim to provide the same satisfaction levels. The
MNS has passed EMC and low voltage tests, and each unit is 100% tested be-
fore delivery.
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AFTER SALES SERVICE CHARACTERISCTICS
Like all CRE Technology products, the Current, voltage and frequency
unit also benefits from our technical • Alternator Voltage: 15-300 V-AC PART NUMBER
support. All CRE products are delivered (Ph-N) A60W1
with one year warranty. • Mains voltages: 300 V-AC max (Ph-N) ASSOCIATED PRODUCT
• DC supply range: 9 to 33 V-DC. Complementary: MDA PLUS
INPUTS • Current consumption: 80mA max.
• DC SUPPLY: 12 or 24 volts DC, (+) and (Outputs open).
(-) terminals. • Low Voltage Limit: Adjustable from
• R-S-T: mains phase voltages. 70 to 270V-AC.
• MN: mains neutral terminal. • High voltage Limit: 320 V-AC Ph-N
• G: Generator phase voltage. (fixed)
• GN: Generator neutral terminal. Sequence timer
• Wait Before Remote Start: 3 sec.
OUTPUTS • Engine Heating Period: 5 sec.
MAINS CONTACTOR: • Generator Contactor Delay: 0.75 sec.
Normally closed relay output connect- • Mains Return Delay: 30 sec.
ing the phase-R voltage to the terminal. • Mains Contactor Delay: 0.75 sec.
(10amps@250V-AC) Environment
GENERATOR CONTACTOR: • Operating temp.: -20 °C (-4 °F) to 70
Normally open relay output connecting °C (158 °F).
the phase-G voltage to the terminal. • Storage temp.: -30 °C (-22 °F) to 80
(10amps@250VAC) °C (176 °F).
• Maximum humidity: 95% non-con-
REMOTE START:
densing.
Normally open engine start request re-
lay output. Connects the battery posi- Dimensions and weight
tive to the terminal. • Dimensions: 72x72x38mm (WxHxD)
(10amps@28V-DC) • Panel cut-out dimensions: 68x68 mm
• Weight: 140g (approx.)
Homologation
• EMC
• Low voltage
MNS
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