S.& A.S. OMEGA-ATS, User Manual, Page: 7 / 46

When the Mains is re-established, the power is switched back with a dead transfer time “Transfer” 
after a restoration delay “Mains Rest.”  and the genset is shut down after the elapse of the “Cooling”
 time. For MGG and GG installation, in case the requested genset fails to start or its contactor fails to
engage or it shuts down due to any fault, the other genset will automatically start and supply the load.
If the “Hold Start”
 is enabled, and in case the genset failed to start, the start signal remains on so that
when it restarts, it will feed the load after disengaging the running genset. When the “Hold Start” is
disabled, the start signal is removed. Manual reset is required to recover from this failure. Please refer
to section 2 for display description.

Mains: The module monitors the Mains supply. The load is fed exclusively from this supply if it is within the
acceptable limits. No gensets will be started if the Mains fails.

G1: In this mode, G2 is always in standby mode. G1 is started when it is in ready mode  and the Mains fails.

G2: In this mode, G2 is always in standby mode. G1 is started when it is in ready mode  and the Mains fails.
In case contactors are used for the transfer switch, each contactor is controlled by one dry contact. The
other dry contact is used as an alarm output (CxD.NO).
If motorized circuit breakers or changeover switches are used, each motorized breaker/ switch is controlled
by two relays. The first has one normally open dry contact (CxENG) and is used to engage the motorized
circuit by giving a pulse of 2 seconds, the second is controlled by a contact that has a common (CxC),
normally open (CxD.NO) and normally closed (CxD.NC) contacts to disengage the motorized circuit breaker
by giving a pulse of 4 seconds.
 Presettable in the menu. Refer to Section 2.4
 Refer to Section 2.5
1. GENERAL
DESCRIPTION