Braking Resistors; Differential Current Braker (Fi) - EURA DRIVES E800 series Safety Instructions, Installation And Operating Manual

1) Common installation rules and safety information regarding EURA E800 inverters
DANGER OF FIRE
BURNS
IMPACT ON
DIFFERENTAL
CURRENT
BRAKERS
E800 – Rev.01 -EN- SOFT Rev. 2.04
© 2015 EURADRIVES EUROPE GmbH

Braking resistors

All kinetic energy of the system converts to heat, during braking cycle.
This energy dissipates in the braking resistor.
Improper dimensioning of the braking resistor or insufficient heat
exchange may result in high risk if fire
Also over-voltage on the input power supply my lead to high risk of
fire
Therefore all braking resistor must have two thermistors, series
connected, which contacts open in case of over-temperature,
disconnecting the whole power supply, on inverters input terminals
Braking resistors surface may become very hot, even
during normal operation. Therefore it is necessary to
mount the resistor in a save location, using proper
protecting cages.

Differential current braker (FI)

The use of frequency inverters may delay or even inhibit the
trigger of differential current brakers.
For life protection, all plant with inverters must have following:
Input wiring protection: Fuses or automatic over-current braker
(Dimensioning: see tables).
Differential current protection: "
(braker), minimum requirement type „B" , mounted on all
inverter power lines.
It is not permitted to connect other equipment on inverter power
lines.
For single phase inverters (230V class) the use of differential
current braker type "A" or "F" is allowed.
The trigger current of the differential current breaker depends on the
operating frequency, motor type, PWM frequency and the lenght of
the motor cable
It is recommended, to use differential current breaker with 300 mA
threshold (for industrial environment).
- 6 -
All-sensitive" protectors