Braking - Control Techniques Unidrive 1 Series User Manual

Safety Product Mechanical
Information Information Installation
Figure 4-5 Preferred chain connection for multiple motors
Motor protection
relay
Chain connection (preferred)
Figure 4-6 Alternative connection for multiple motors
4.5.3 Star / delta motor operation
The voltage rating for star and delta connections of the motor should
always be checked before attempting to run the motor.
Unidrive User Guide
Issue Number: 9
Electrical Getting
Menu 0
Installation Started
Motor protection
relay
Star connection
Inductor
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Running
Optimisation Macros
the motor
The default setting of the motor rated voltage parameter is the same as
the drive rated voltage
i.e. 400V drive 400V rated voltage
200V drive 200V rated voltage
A typical 3 phase motor would be connected in star for 400V operation
or delta for 200V operation however variations on this are common
i.e. star 690V delta 400V
Incorrect connection of the windings will lead to severe under or over
fluxing of the motor, leading to a very poor output torque or motor
saturation and over-heating respectively.
4.5.4 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
WARNING
interrupted with the motor running at high current and low
speed.
A contactor is sometimes required to be fitted between the drive and
motor for safety isolation 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 RFI noise emission
3. Increased contactor wear and tear
For more information please contact the supplier of the drive.
4.6

Braking

Internal connection does not require the cable to be armoured or
shielded.
In-built in the Unidrive software is overload protection for the brake
resistor. In order to enable and set-up this function, it is necessary to
enter two values into the drive:
• Resistor short-time overload time (Pr 10.30)
• Resistor minimum time between repeated short-time overloads (Pr
10.31)
This data is available from the manufacturer of the braking resistors.
4.6.1 Minimum resistances and power ratings
Table 4-4 Minimum resistance values and peak power rating for
the braking resistor at 40°C (104°F)
Model
UNI1201 to UNI1205
UNI2201
UNI2202 to UNI2203
UNI3201 to UNI3205
UNI1401 to UNI1405
UNI2401
UNI2402 to UNI2403
UNI3401 to UNI3405
UNI4401 to UNI4405
The minimum resistance allows the braking resistor to dissipate up to
approximately 150% of the power rating of the drive for up to 60
seconds.
For high-inertia loads or under continuous braking, the continuous power
dissipated in the braking resistor may be as high as the power rating of
the drive. The total energy dissipated in the braking resistor is dependent
on the amount of energy to be extracted from the load.
Advanced Technical
Diagnostics
Parameters Data
Minimum Instantaneous
resistance power rating
Ω
20
20
15
5
40
40
30
10
5
UL Listing
Information
kW
15
15
20
60
15
15
20
60
120
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