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> Woodward aptl 9905-007 auto power transfer and load
Woodward aptl 9905-007 auto power transfer and load
GOOD WORKING CONDITION WOODWARD APTL TAKING OUT OF A WORKING SYSTEM THAT WAS UPGRADED
The APTL Control provides new levels
of control for standby generators or
cogeneration. The control permits truly
bumpless transfer of loads from the local
system to and from the utility or to and
Long ramp rates can improve engine
economics and extend engine life.
Electronic ramping times for loading
or unloading are adjustable from 5
Power transfer is controlled for:
Amount of load set by computer
Amount of load set by an internal or an
Meter output indicates the percentage of
system generating capacity in use.
Adjustable ramps replace MOPs for loading
or unloading. Ramp rates for loading and
An APTL Control provides low and high
Tracks plant load when not connected to a
Locks in load when paralleled until load or
The APTL Control provides a compact
control unit for a load-sharing system, offering
features not previously available. The APTL
prevents load bumps when joining to and
The APTL Control adjusts the output of the
generating system by biasing the load-sharing
lines. The APTL will provide loading control
for the entire system, or for a single-engine
generating set. Individual Generator Loading
Controls are needed to unload and load
individual units of multiple-generator systems.
The APTL Control, when combined with
electronic load sharing and speed controls and
an SPM-A Synchronizer provides an automatic
method of exercising emergency generators or
The emergency system is started and
synchronized with the utility. Paralleling at no
load on the standby generator is accomplished
with the synchronizer. The APTL Control is
activated by an auxiliary contact on the
paralleling circuit breaker. The APTL then
holds the emergency generator at no load.
At the same time switching logic closes the
Utility Unload contacts, causing the local load
to be transferred from the utility to the
emergency generator at the selected rate. When
the transfer is completed the single-pole,
double-throw Utility Unload contacts will
open. These contacts are used to initiate an
automatic separation from the utility.
Several loading methods are available for use
After exercising the generators, a bumpless
return to the utility is accomplished through
the normal sequence of synchronizing and
paralleling, and then using the unload mode
and the unload-relay contacts in the APTL
Control to initiate separation and shutdown
The APTL Control sets new standards of
automation for standby generation
