Nidec DFS 1, Руководство по установке электроустановки

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DFS1/DFS2 Power Installation Guide
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Issue Number: 2
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4.12 Output contactor
A contactor is sometimes required to be installed between the drive and motor for safety purposes.
The recommended motor contactor is the AC3 type.
Switching of an output contactor should only occur when the output of the drive is disabled.
Opening or closing of the contactor with the drive enabled will lead to:
1. OI ac trips (which cannot be reset for 10 seconds)
2. High levels of radio frequency noise emission
3. Increased contactor wear and tear
The Drive Enable terminal (terminal 31 on
Unidrive M700 / M701 and terminal 29 on
Powerdrive 300 ) when opened provides a Safe Torque Off function. This can in many cases replace
output contactors.
For further information see the
Control User Guide .
4.13 Safe Torque Off
The drives are provided with a Safe Torque Off function. In many cases this can replace output
contactors.
For further information see the Unidrive M700, M701, M702 Control User Guide. CT Part Number:
0478-0353-02.
4.14 Braking
Output contactor
If the cable between the drive and the motor is to be interrupted by a contactor or circuit
breaker, ensure that the drive is disabled before the contactor or circuit breaker is opened
or closed. Severe arcing may occur if this circuit is interrupted with the motor running at
high current and low speed.
Safe Torque Off does not provide isolation
The Safe Torque Off function does not remove dangerous voltages from the drive and
does not isolate the motor output terminals.
Braking
The current range of DFS drives are not provided with Braking resistors, cabling or a brake
overload protection circuit that disconnects the drive from the supply in the event of an
overload or fault.
Contact the supplier of the drive if braking is required.
WARNING
WARNING
WARNING