Applications, Installation; Front Panel, Measure Selection And Status Leds - LOVATO ELECTRIC ATL20 Manual Operativo

2
APPLICATIONS
– Utility-to-utility, utility-to-generator or generator-to- generator changeover
– Control of motorised circuit breakers, motorised switches or contactors
– Generator management with automatic test and rotation-emergency
– Three-phase, two-phase or single-phase voltage controls
– L-L voltage and/or L-N voltage control
– Controls of minimum voltage, maximum voltage, phase loss, asymmetry, minimum frequency, maximum frequency, with independent enable and delay
– Voltage thresholds with programmable hysteresis.
INSTALLATION
– Install the unit following the wiring diagrams on the last pages of this manual.
– Use the appropriate wiring diagram for the application.
– Program parameters based on the wiring diagram adopted and pay particular attention to the programming of inputs/outputs.
NOTES ABOUT POWER SUPPLY CIRCUITS
– ATL20 and ATL30 have a dual power supply circuit, that means they can operate with both AC and DC supply or with only one of the two indifferently.
– In presence of both power supplies, energy is drawn from the AC source. In this case, only a little power is drawn from the DC source, needed to allow
operation of the supply circuit itself.
– To maintain the control active during the changeover operations, it is advisable to power the controller with the DC supply provided by backup battery or
UPS.
A
C
FRONT PANEL
– The unit front panel is equipped with two LED displays which show the voltages of the two supply lines (Line 1 and Line 2) with the relevant key for
measurement selection.
– Four keys, OFF-MAN-AUT-TEST (E-F-G-H), enable to select the operating mode, which is displayed by the corresponding LED.
– A mimic diagram is located in the centre of the front panel; it shows the presence of the power supply sources and the status of circuit breakers for load
connection.
– Two keys (C and D) allow the manual control of circuit breakers.
MEASUREMENT SELECTION
– Press the key under each display
(A and B) repeatedly to display the various measurements related to the line in question.
– Line-to-line (L-L) voltages, line-to-neutral (L-N) voltages and frequency are available for each line.
– Red LED combinations indicate which measurement is selected. The list of measurements varies depending on whether the unit is set up for three-phase,
two-phase, or single-phase control.
– After 1 minute without touching the key, the measurement reverts to default value, which may be the first L-L voltage or the first L-N voltage depending on
the setting of the voltage control.
– In case of alarms or messages, the alarm code will occupy the display. Pressing the selection key will mask the alarm temporarily and allow the
measurements to be accessed.
B
E
F
D
G
H
G
B