GHIELMETTI 674.114.913.02, Manual

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GHIELMETTI AG – 7UW50 - Technische Dokumentation ROR/09.02.2021 Page 11 of 19
Warning : Some of the following test steps carried out in presence of hazardous voltages. The shall
be performed by qualified personnel only which is thoroughly familiar with all safety regulations and
precautionary measures and pay due attention to them. Non-observance can result in severe
personal injury.
Before initial energization with supply voltage, the relay shall be situated in the operating area for at
least two hours in order to ensure temperature equalization an to avoid humidity influences an
condensation.

Check the DC. voltage for the supply of the device, the DC voltage from the trip relays of the
protection and supervision relays connected to the matrix columns, and the DC voltage for
all switching elements (breaker coil or master trip relays) connected to the matrix outputs
(rows) have the same origin and belong to the same DC circuit

Switch off the circuit breakers for the DC supply

Fit a DC ammeter in the auxiliary power circuit (range approx.. 1.5A to 3A)

Close the battery supply circuit breaker; check polarity and magnitude of voltage at the
terminals of the unit or at the connector module

The green LED on the front must come on after at most 0.5s. The unit faulty alarm contact
of the auxiliary supply circuit must disappear after at most 1s. the current consumption data
given in the Specifications

Open the circuit breaker for the DC power supply

Remove DC ammeter; reconnect the auxiliary voltage leads

Check through the control wiring from the protection devices

Check through the tripping circuits to the circuit breakers or to the eternal trip relays

Check the signal circuits

Close the battery supply circuit breaker
13 Operating Instructions
13.1 Safety precautions
Warning : All safety precautions which apply for work in electrical installations are to be observed
during tests and commissioning.
Caution : Connection of the device to a battery charger without connected battery may cause
impermissibly high voltages which damage the device. See also Section 3.1. 1 under Technical data
for limits.
13.2 Operation of the device
The diode plugs are accessible after removal of the front cap of the unit which can be sealed. The
diode plugs can be re-plugged under current-free conditions, in accordance with the required
tripping scheme.
13.2.1
Marshalling of the trip commands
The matrix device comprises 28 inputs (columns) and 10 outputs (rows). Programming is carried out
by putting a black diode plug into the cross point of a column and row.
Caution : Do not draw-out or insert a plug under load! Each column can be made effective by
inserting the assigned red master plug