Lenze 8400 - Manual (Page 254)

Braking operation
Braking operation with external brake resistor
Rating for Lenze brake resistors
8
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254 EDS84ASC552 EN 9.1
8.2.5 Rating for Lenze brake resistors
To decelerate greater moments of inertia or with a longer operation in generator mode an
external brake resistor is required. It converts braking energy into heat.
The brake resistors (IP20) recommended in the table are designed to tolerate a
regenerative power of approx. 1.5 times the normal value. The cycle time of the brake
resistors is 150s and includes abrakingtime ofmax. 15sand arecovery time(pause)ofmin.
135s.
ƒ The brake resistors are equipped with a thermostat (potential-free NC contact,
switching capacity: AC 250V, 0.5A).
ƒ To increase the power, brake resistors can be connected in parallel or in series.
– The resistance for the controller must not fall below the lowest permissible value.
– The thermostat of several brake resistors at a controller must always be connected
in series.