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2 Introduction of Installation and
Operation Guide
2.1 Purpose of this manual
2.2 Conformity declaration
2.3 Warnings
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Congratulations to your purchase of ComAp MainsPro G99TT unit! MainsPro G99TT is a microprocessor-
based protective relay, providing a comprehensive set of protective and supplementary functionalities. The
basic protective functions are:
Voltage
Frequency
Loss of mains
This covers the basic requirements for mains-decoupling (inter-tie) protection, but allows also usage in many
applications where benefits of the unit's unique functionality is needed.
2.1 Purpose of this manual
The Installation and Operation Guide serves for the personnel providing installation of the MainsPro G99TT
unit. It contains wiring and setting instructions needed for installation and commissioning of the unit. It also
contains introduction of the user interface and necessary procedures for setting and operation of the unit.
Although MainsPro G99TT is very simple and intuitive for the operating personnel, we recommend keeping a
hardcopy of this manual available permanently at the site where MainsPro G99TT unit is installed, to facilitate
the necessary service and operation tasks.
2.2 Conformity declaration
Following described machine complies with the appropriate basic safety and health requirement
of the EC Low Voltage Directive No: 73/23 / EEC and EC Electromagnetic Compatibility Directive
89/336 / EEC based on its design and type, as brought into circulation by us.
2.3 Warnings
IMPORTANT: Be aware that the relay outputs can change state during and after the unit setting
(before the unit is used again ensure that the proper setting is done)!!!
IMPORTANT: Be aware that the devices connected to binary outputs of the unit may operate
upon disconnection of power supply, measurement inputs and/or binary inputs!!!
2.3.1 Dangerous voltage
In no case touch the terminals for voltage and current measurement!
Always connect grounding terminals!
Before accessing potentially life-threatening live parts the device must be isolated or disconnected from
MainsPro G99TT 1.0.0 Global Guide
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