MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM047 Rev 13 05/03/30
64
Thomson Technology
Delay timer will start when The Utility Ready To Load output de-energizes. Once
the Neutral Delay time period expires, The Generator Ready To Load output will
then be energized. The similar sequence will occur when transfer in the opposite
direction. The purpose of the Neutral Delay timer is to prevent out of phase
transfers, which may be caused by a fast transfer and the two sources of supply
are out of synchronism. The Neutral Delay timer ensures the load voltages
decay before the transfer is initiated.
Set to the desired time in seconds. The Neutral Delay timer is typically set for 3
seconds. Refer to
Section 9.3
for further details on this timing function.
NOTE:
The Neutral Delay feature is only
effective when an electrically held
“contactor-type” transfer switch is
connected. Contact Thomson
Technology for further application
information on use with other types of
transfer switch mechanisms.
10.3.28. RETURN DELAY
The Return Delay programming menu appears when the Utility Ready To Load
programmable output is selected as is typically used in an AMF application. The
Return Delay is initiated once the remote start signal is removed, signaling that
utility power is now available. Once the Return Delay timer expires, the
Generator Ready To Load output will be removed, and the Utility Ready To Load
output energizes to signal transfer the load back to the utility supply. The purpose
of the Return Delay timer is to ensure that the utility power has returned to a
steady state for the selected time period before the load is transferred back to the
utility supply. The Return Delay timer is typically set for 120 seconds. Refer to
Section 9.3
for further details on this timing function.
10.3.29. PROGRAMMABLE OUTPUT CONTACTS
Select the desired function that will activate the designated programmable relay
output contact. One of the following functions may be selected:
