Unloaded System Test; Loaded System Test; Closed-Transition Loaded Test - Kohler MPAC 1500 Manual

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Note: See Figure 3-15 for Sync Check screens.
Figure 3-12 Test Sequence Screens
36 Section 3 Operation
Appears if load control
time delays are set
Programmed-transition
models only
Appears if load control
time delays are set
Appears if load control
time delays are set
Programmed-transition
models only
Appears if load control
time delays are set

3.10.1 Unloaded System Test

When an unloaded test is initiated, the controller
immediately signals the generator to start, without
waiting for the engine start time delay to expire. The
contactor does not change position during an unloaded
test, but if the normal source should fail, the contactor
will transfer to the emergency source. The unloaded test
feature is available only with the Util-Genset and
Genset-Genset modes of operation.
The load bank control output is active during an
unloaded exercise or unloaded system test.
contactor transfers to the standby position during the
test, the load bank control is deactivated. (The standby
source supplies power to the load.)

3.10.2 Loaded System Test

A loaded test simulates a preferred source failure,
except that the engine start time delay is bypassed. The
generator set is signaled to start immediately upon test
activation. Load control signals are issued prior to
transfer with their associated time delays. Since the
loaded test transfer will be between two live sources, the
in-phase monitor or closed transition feature will be
activated if it is enabled. If the preferred source is lost
during a loaded test with the contactor in the standby
position, the test will continue to be active, even on
restoration of preferred. If the standby source is lost and
the preferred source is available, the test will be
terminated, and the transfer switch will immediately
transfer to the preferred source position, bypassing all
time delays except the off-position requirements in a
programmed-transition system.
When a loaded test is terminated normally, the
retransfer sequence operates as though the preferred
source has been restored after a failure. All time delays
are executed and an in-phase transfer will occur if
enabled. The loaded test feature is available with the
Util-Genset, Util-Util and Genset-Genset modes of
operation.

3.10.3 Closed-Transition Loaded Test

When a loaded test is initiated on a closed-transition
model, the generator set is signaled to start and the
controller monitors the sources for synchronization.
The load is transferred when the sources are
synchronized.
If the
TP-6714 4/10