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Unidrive Regen Installation Guide
www.controltechniques.com
Issue Number: 2
6
Important considerations
6.1
Fundamentals
6.1.1
You must
•
Use Regen inductors of the correct type and value, as specified.
•
Use a start-up resistor of the correct type and value, as specified.
•
Connect the Regen drive output enable signal to the enable input on the motoring drive(s).
•
Use a switching frequency filter if an RFI filter is present or the AC supply is not dedicated solely to the Regen drive.
•
Fit fuses where specified, and ensure they are of the correct rating.
•
Ensure that the cubicle is correctly sized and ventilated, taking into account the losses generated by all of the circuit components.
6.1.2
You must not
•
Connect a circuit of any type between a Regen and motoring drive’s DC bus.
•
Attempt to use a Unidrive size 1-4 Regen in parallel configuration (only Unidrive size 5 Regen can be used in parallel configuration).
6.2
Unidrive size 3 and 4
If a Unidrive size 3 or 4 of any other variant except the Regen variant is to be used in a Regen system, an internal modification is required to both the
Regen and motoring drive(s).
N
Modification of the drive must only be carried out by CT authorised personnel. If any details are required, contact C.T. Technical support.
6.3
Ventilation
When designing a Regen System, considerations must be made for the additional ventilation requirements due to the introduction of the Regen and
Switching Frequency filter inductors.
A Regen System can operate in an ambient temperature range of 0°C to 50°C (32°F to 122°F) for Unidrive sizes 1 to 5. An output current derating
must be applied with ambient temperatures between 40°C and 50°C. For derating figures see the Unidrive Size 1 to 5 User Guide.
Ventilation for both the Regen and motoring drives in the system should be as specified in the Unidrive Size 1 to 5 User Guide. Provided the
maximum cable lengths in Table 6-3 on page 18 have not been exceeded, natural air flow ventilation through the Regen and switching frequency filter
inductors is adequate. In special conditions, where the maximum cable length (refer to Table 6-3 on page 18) has been exceeded, forced cooling
should be introduced for the Regen Inductor as specified in Appendix C Long cables on page 41.
When sizing the cubicle(s) for the Regen system considerations must be made for the systems losses.
Damage to the drive(s) will result if this modification is not carried out.
The inductors have normal operating temperatures of approx. 150°C depending upon the ambient and the motor cable lengths. Care must
be taken so that this does not create a fire risk.
System Losses
Documented In...
RFI Filter
Unidrive Size 1 to 5 User Guide
Regen drive
Motoring drive
Control Module, Unidrive size 5
Power Module, Unidrive size 5
CAUTION
NOTE
CAUTION
