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Terminals using automatic cage clamps are provided. Tightening torque is not
applicable.
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These devices provide Class 10 motor overload protection. The maximum internal
overload protection level (current limit) is 150% for 30 seconds. Refer page 5-1 for
user current limit adjustment information.
An external motor overload protective device must be provided by the installer
where the motor used has a full-load ampere rating of less than 50% of the drive
output rating.
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These devices are provided with solid state short circuit (output) protection. Branch
circuit protection should be provided as specified in the National Electrical Code,
NEC/NFPA-70.
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The wiring terminals accept a maximum conductor size of No. 12 AWG (3.3mm2).
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During deceleration, or with an overhauling load, the motor acts as a generator.
Energy flows back from the motor into the DC link capacitors within the Frequency
Inverter. This causes the DC link voltage to rise. If the DC link voltage exceeds
810V then the Frequency Inverter will trip to protect the capacitors and the Inverter
power devices. The amount of energy that can be absorbed in the capacitors is
relatively small; typically more than 20 % braking torque will cause the Frequency
Inverter to trip on overvoltage. Dynamic braking increases the braking capability of
the Frequency Inverter by dissipating the excess energy in a high power resistor
connected across the DC link. See Figure 4.5 for Dynamic Brake Switch
specification.
When the DC link voltage rises
above 750 V, the brake unit switches
the external resistor network across
the DC link. The brake unit switches
'%54
EXTERNAL
RESISTOR
NETWORK
+
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off again when the DC link voltage
GATE
DRIVE
falls below the threshold level. The
CIRCUIT
amount of energy produced by the
motor during regeneration depends
upon the RAMP DOWN TIME
parameter and the inertia of the load.
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