Specifications

The ASCO 7000 Seri es Soft Load Power Transfer Switch
synchronizes and parallels two independent power sources,
without interrupting power flow. The switch can be programmed
to either maintain parallel operation of both power sources,
or transfer the load to the onsite generating unit, avoiding
transients caused by block loading.
Synchronizing Power Ensures Continuity
24-hour protection no matter
when trouble strikes
3
Coupled with Web-enabled
ASCO
POWERQUEST
®
command
and control, the Soft Load Power
Transfer Switch enables you to
use your onsite generation unit
for soft load transferring, base
loading, importing or exporting.
Soft Load Power Transferring
In the soft load power trans-
fer mode, the transfer switch
synchronizes and parallels the
onsite generating unit to the
utility source, then immediately
instructs the generating unit
to assume a preset load value
(Gen Minimum Load Setpoint).
The Soft Load Controller then
continues to control generator
excitation to the preset
power factor setting. It begins
increasing load on the engine
at a preset ramp time rate. At
the point the load on the util-
ity source drops to the cutoff
value, the switch disconnects
the utility feeder.
Continuous Base Loading
In the base loading mode, the
generating unit operates con-
tinuously in parallel with the
utility source until operation
is discontinued on command.
While operating, the soft load
controller holds the load and
power factor to the generat-
ing unit constant. Load varia-
tions are carried by the utility
source. The switch retransfers
the load to the utility source if
the generating unit malfunc-
tions.
Power Importing
or Exporting
In the importing or export-
ing modes, the power
transfer switch maintains
the generating unit in par-
allel with the utility source.
The switch’s Soft Load
Controller instructs the gen-
erating unit to produce the
required output and var-
ies the load on the unit to
maintain the set import or
export level. Load variations
are carried by the generat-
ing unit up to the maximum
generator load setting.
If either the utility or gen-
erator power fails in any of
the modes, the load auto-
matically transfers to the
available source.