MainsPro, SW version 1.4, ©ComAp – January 2013
MainsPro Installation and Operation Guide
For proper connection of the power supply, see also the printed sign on the MainsPro 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 withstand, 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!
The difference between power supply voltage and measured voltage must not exceed 1kV (peak-to-
peak), otherwise external power supply with appropriate voltage withstand is recommended to use.
For isolated, ungrounded systems is external, galvanically isolated power supply 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.
Note:
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!
Relay outputs connection
For safety purposes, it is recommended to set all MainsPro relay outputs to inverse logic for failure
trips and signalling. This means that under fault-free conditions all contacts are kept in energized
position. In trip or out-of-range signalling state, the contacts de-energize. In case of power-supply fail,
the unit automatically moves to fault-signalling 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 signalling state, the contacts energize. These
outputs are without exclamation mark (i.e.CommTrpPer).
Relay outputs in MainsPro are freely assignable by the setpoints f(RE).
- In default configuration, RE1 serves as the permanently energized common trip output contact
(!CommTrpPer). Use this contact to operate the connector devices with permanently
energized inputs.
- In default configuration, RE2 serves as an impulse common trip contact (CommTrpImp). Use
this contact to operate e.g. opening or UV coil of circuit breakers.
- Remaining 3 relay outputs serve for signalling of any sensed failure.
- The arrangement of RE1 to 4 outputs in default configuration corresponds to the functionality
of the previous NPU-FUV unit outputs.
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