Relay Outputs Connection - ComAp MainsPro G99TT Global Manual

For proper connection of the power supply, see also the printed sign on the MainsPro G99TT unit:
Requirements for power supply connections
The unit is suitable for permanent connection to the power supply. The power supply circuits must have
sufficient current stability, corresponding to the appropriate power supply range and comply with the
standards relevant for the installation.
Note: External power supply is recommended in order to avoid excess of allowed supply voltage (256Vrms,
respectively 370V of peak value including dc offset).
Please be aware that not all power meters can detect the supply voltage including the dc component!
Note: The difference between power supply voltage and measured voltage must not exceed 1kV (peak-to-
peak), otherwise external power supply with appropriate voltage stability is recommended to use. For
isolated, ungrounded systems external, galvanically isolated power supply is recommended in all cases.
Requirements for power supply disconnecting device:
In case of power supply from AC voltage, the unit must be equipped by circuit breaker or contactor, marked as
disconnecting device in accordance with the EN 61010-1 standard.
IMPORTANT: The power supply circuit 8-40 VDC is internally interconnected with the supply
circuit 85-265 VAC. In case of operation with both power supply terminals connected, keep in
mind, that a failure of insulation in the AC power supply may cause propagation of AC voltage
into the circuits of low safe DC voltage, due to galvanic interconnection of both circuits!

3.3.6 Relay outputs connection

For safety purposes, it is recommended to set all MainsPro G99TT relay outputs to inverse logic for failure
trips and signaling. This means that under fault-free conditions all contacts are kept in energized position. In
trip or out-of-range signaling state, the contacts de-energize. In case of power-supply fail, the unit
automatically moves to fault-signaling by de-energizing the output relays, assuring safety disconnection of
the controlled devices. These outputs are marked with exclamation mark (i.e.!CommTrpPer).
However, the outputs can be set to normal logic which means, that in fault-free state all contacts are kept in
de-energized position. In trip or out-of-range signaling state, the contacts energize. These outputs are without
exclamation mark (i.e.CommTrpPer).
MainsPro G99TT 1.0.0 Global Guide
15