MANUAL
EFU10000
4.0kVA INVERTER UNIT
Pag. 19
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7.2 B
RAKING
A braking system is used in order to prevent the DC voltage rising to an impermissible value. When
used, it activates a braking resistor (external to inverter) that is connected in parallel to the inverter
BUS capacitors. The over voltage energy is converted to heat via the braking resistor.
WARNING
Braking resistors may be subject to unexpected overloads due to faults.
Resistors MUST be protected using thermal cutouts. These devices
must not interrupt the circuit in which the resistor is inserted but their
auxiliary contact must cut off the power supply to the power section of
the inverter. If the resistor requires a protection contact, this must be
used
together
with
that
of
the
thermal
cutout.
7.3 B
EHAVIOUR OF
LED
S
On connector CON7 three LEDs can be externally connected for monitoring the inverter working
conditions. A detailed description of the LEDs behavior is reported on Table 3, while on paragraph
10 “TROUBLESHOOTING” the related user’s operating actions are suggested.
POS.
RED LED
GREEN LED
YELLOW LED
CONDITION
1
Fast flashing
Fast flashing
Fast flashing
Pre-Test & Start-Up
2
Slow flashing
Slow flashing
Slow flashing
Inverter ready for generating
3
OFF
ON
OFF
Inverter normally operating
4
Slow flashing
ON
ON
Overload Condition
5
ON
OFF
ON
Overload Protection
6
Slow flashing-
ON
Slow flashing
Overtemperature Condition
7
ON
OFF
Slow flashing
Overtemperature Protection
8
OFF
Slow flashing
OFF
Output Undervoltage (see paragraph
11.5.7)
9
ON
Slow flashing
ON
Output Undervoltage (not Severe)
Protection
10
ON
Slow flashing
OFF
Output Undervoltage (Severe)
Protection
11
Slow flashing
ON
Fast flashing
BUS Overvoltage Condition (I
st
level)
12
ON
OFF
Fast flashing
BUS Overvoltage Protection
13
ON
OFF
OFF
Inverter Failure
14
ON
Fast flashing
Fast flashing
Brake Resistor Protection
15
ON
ON
ON
Generator behavior or external AC
voltage connected to the inverter output
Table 3: LEDs behaviour
