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ATS16A Automatic Transfer Switch

The Power Inspired ATS16A, is a fully featured Automatic Transfer Switch (ATS) designed to automagically transfer power from one source to another should the preferred power source fail, aiding in creating a resilient installation for 3KVA UPS Systems. The ATS16A is rack mountable occupying only 1U of rack space.

Power Inspired ATS16A Automatic Transfer Switch

The system comprises two input sources, A&B. Both can be switched on and off from the front panel. There is no master and slave, instead the preferred source is simply selected from the front panel. If source A is selected and should fail, source B will become active and vice versa.

Automatic Transfer Switch Built in PDU

The rear panel of the Automatic Transfer Switch is a comprehensive Power Distribution Unit PDU, with a 16A output and two banks of 4xIEC 10A outlets allowing the connection of a full range of attached equipment without the need for additional PDU’s.

The rear panel also incorporates a contacts port to allow ATS status to be communicated to remote alarms or a Building Management System.

Further communication is available via the RS232 or USB interface, and with software for Windows operating systems gives full control and monitoring of the Automatic Transfer Switch. You can monitor Voltage, Frequency and Status of both A&B inputs, the selected output load in Amps and % of load, as well as environmental conditions (temperature & humidity). You can control the levels at which you require the input voltages to be deemed out-of-tolerance and change over, set up notifications and alarms. The ATS16A can also be fitted with an SNMP card via the Intelligent slot to allow monitoring of the Automatic Transfer Switch over a network.

The Automatic Transfer Switch is typically used in two applications. One for providing UPS redundancy, and the other for providing continuous power by means of a generator.

ATS providing n+1 redundancy

n+1 Arrangement

To achieve n+1 power redundancy, the two UPS are connected to inputs A & B. UPS A is chosen as the primary. Should power from UPS fail, the ATS16A will automagically transfer to UPS B.

ATS connection diagram-gen-set

ATS connection diagram-gen-set

For continuous operation requiring a Gen-Set, the UPS is set to input A and the gen set to input B. Set Input B to primary power source. In normal operation, the Gen Set will be Off, resulting in the ATS selecting input A supplied from the UPS. The UPS should be fitted with a Dry Contact Card, and in the event of mains failure, a relay activates which starts the gen set.

When the power from the gen-set is in tolerance, the ATS will then transfer power from input A to input B, with the load now supplied by the gen set. When power returns the gen set can be switched off, and power will return to the UPS supply.

The advantage of this arrangement is that you can use the ATS PDU to power the loads. The disadvantage is unconditioned power to the load when on gen set operation, and the requirement for a dry contact card on the UPS.


ATS Connection Diagram-gen-set-alt

ATS Connection Diagram Gen Set Alternative

An alternative arrangement is to have the two inputs as Utility and Gen Set. The output from the ATS feeds the UPS which feeds the load. If Utility is source A and Gen Set source B, B is set to primary. Should the mains fail or go out of set limits, the ATS will have no power inputs. The contact card on the ATS16A, then activates the Gen Set, which will start up the ATS16A again, resulting in source B powering the UPS.

The advantage of this arrangement is the UPS is always in circuit, the disadvantage is the requirement to use the UPS PDU and the fact that the ATS16A effectively will be shut down during transition.

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