Sens NRG24-20 Spezifikationen PDF herunterladen (Seite 69)

Our energy working for you.™

www.cumminspower.com

and Cummins are registered trademarks of Cummins Inc. PowerCommand and “Our energy working for you.” are trademarks of Cummins

Power Generation. Other company, product, or service names may be trademarks or service marks of others.

S-1270z (7/08)

Time-delay functions

Engine start: Prevents nuisance genset starts in the event of momentary power system variation or loss. Not included

in utility-to-utility systems.

Transfer normal to emergency: Allows genset to stabilize before application of load. Prevents power interruption if

normal source variation or loss is momentary. Allows staggered transfer of loads in multiple transfer switch systems.

Retransfer emergency to normal: Allows the utility to stabilize before retransfer of load. Prevents needless power

interruption if return of normal source is momentary. Allows staggered transfer of loads in multiple transfer switch

systems.

Engine stop: Maintains availability of the genset for immediate reconnection in the event that the normal source fails

shortly after retransfer. Allows gradual genset cool down by running unloaded. Not included in utility-to-utility systems.

Delayed (programmed) transition: Transfers load to neutral position, disconnected from sources, to allow inductive

load voltages to decay.

Fail to disconnect timer: Signals external device to disconnect either the genset or utility to prevent extended

operation in parallel with the utility.

User interfaces

Basic interface panel

LED indicators provide at-a-glance source and transfer

switch status for quick summary of system conditions.

Test and override buttons allow delays to be bypassed

for rapid system checkout.

Digital display (M018)

The digital display provides a convenient method for

monitoring load power conditions, adjusting transfer

switch parameters, monitoring PowerCommand network

status or reviewing transfer switch events. Password

protection limits access to adjustments to authorized

personnel. The digital display comes standard with the

Level 2 PowerCommand microprocessor control and is

optional with the level 1 control.

User interface options

Front panel security key (M017)

Front panel access can be locked out using this option.

Prevents unauthorized transfers or testing. Prevents

unauthorized adjustments via the digital display.

Analog bar graph meter (D009)

An LED bar graph display provides easy to read

indication for normal and emergency voltages and

frequencies, load currents, power factor, and kilowatts.

Green, amber, and red LEDs provide at-a-glance

indication of system acceptability. Available as an option

with the Level 2 PowerCommand microprocessor

control.

Control options

Relay signal module (M023)

Provides an adjustable transfer pre-signal time delay of 0

to 60 seconds to prevent interruption of power during

elevator operation. Relay outputs include: Source 1

Connected and Available, Source 2 Connected and

Available, Not in Auto, Test/Exercise Active, Failed to

Disconnect, Failed to Synchronize, Failed to

Transfer/Retransfer, and Transfer pre-signal (elevator

signal).

Loadshed (M007)

Removes the load from the emergency power source by

driving the transfer switch to the neutral position when

signaled remotely. Transfers load back to the emergency

source when the signal contacts open. Immediate

retransfer to the preferred source when it is re-

established.

PowerCommand network interface (M031)

Provides connection to the PowerCommand network.

LonWorks compatible for integration into customer

monitoring strategy.

Load power and load current monitoring (M022)

Measures load phase and neutral, current, power factor,

real power (kW) and apparent power (kVA). Warns of

excessive neutral current resulting from unbalanced or

nonlinear loads.

* Note: Some options may not be available on all models - consult factory for availability.

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