InteliATS
NT
PWR, SW version 2.5, ©ComAp – May 2015 34
IA-NT- PWR-2.5-Reference Guide.pdf
AMF + no battery operation
Specification
It is possible to operate controller without a battery supplying the controller. For such operation the
following conditions have to be fulfilled:
Controller is supplied from 24V/2.5A AC/DC power supply whose source is switched between
Mains and Gen-set via relay (another contacts of the relay for GCB switching) according to
the Mains state (OK/Fault). See the schematic diagram for more details
Normally closed relay contacts have to be used for the gen-set start command. Setpoint
“GenStart Logic” has to be set to CLOSE-OFF
Switching of the 24V AC/DC power supply is blocked when GCB is closed, so the power
supply is not switched to Mains if voltage on the mains bus appears – protection against
“Flip-flopping” of the power supply when voltage changes arise on Mains.
It (power supply) will be switched to Mains when GCB is opened.
Then in the case of Mains failure:
24V AC/DC power supply source is switched to gen-set
Voltage supplying controller disappears
Gen Start relay is deenergized and contacts closed
Gen-set is started
Controller is supplied from running gen-set
Controller is initialized, waits for Gen OK conditions
MCB is opened, GCB closed and the 24V AC/DC power supply source is locked in gen-set
position.
If Mains returns:
GCB is opened, 24V AC/DC power supply source is unlocked and switched to Mains
MCB is closed
Gen-set is stopped
Hardware requirements
1x IA-NT PWR
1x 24V/2.5A AC/DC power supply
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