28
Fig 2.18 Connecting Braking Units in Parallel
Breaking
Unit
Application
Precautions
When
using
a
Braking
Resistor
Unit,
create
a
sequence
to
detect
overheating
of
the
braking
resistor
and
turn
OFF
the
power
supply
to
the
Inverter.
Fig 2.19 Power Shutoff Sequence
Inverter
Braking resistor overheat-
ing contacts (Thermal pro-
tector contacts)
Braking resistor overheat-
ing contacts (Thermal pro-
tector contacts)
Braking resistor overheat-
ing contacts (Thermal pro-
tector contacts)
Braking
Resistor
Unit
Braking
Resistor
Unit
Braking
Resistor
Unit
Level
detector
Braking Unit #2 Braking Unit #3
Braking Unit #1
Cooling fin overheating con-
tacts (thermostat contacts)
Cooling fin overheating con-
tacts (thermostatic contacts)
Cooling fin overheating con-
tacts (thermostatic contacts)
Inverter
Three-phase power:
200 to 240 V, 50/60 Hz or
380 to 480 V, 50/60 Hz
MCCB
Overload relay trip contact
of Braking Resistor Unit
Fault contacts
* Use a transformer with 200 and 400 V outputs for the power 400 V Inverter.
R/L1
S/L2
T/L3
MC
MA
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