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Unidrive M Regen Design Guide 123
Issue Number: 4
Table 6-11 Unidrive M Rectifier AC cable ratings
* Twin rectifier
Cable sizes are from IEC60364-5-52:2001 table A.52.C with correction factor for 40 °C ambient of 0.87 (from table A52.14) for cable installation
method B2 (multicore cable in conduit).
Cable size may be reduced if a different installation method is used, or if the ambient temperature is lower.
The cable sizes noted in Table 6-7 to Table 6-10 are typical cable sizes based on UL508C and IEC60364-5-52:2001. Maximum cable sizes for size 11
are 2 x 240 mm² or 2 x 400 kcmil per pole. The user will have to decide what size of cable to use in any given application based on the local wiring
regulations. Use of high temperature cables that are thinner than those stated in the typical cable chart maybe possible, contact the supplier of the
drive for advice.
Installation method (ref:IEC60364-5-52:2001)
B1 - Separate cables in conduit
B2 - Multicore cable in conduit
C - Multicore cable in free air
A fuse or other protection must be included in all live connections to the AC supply.
Fuse types
The fuse voltage rating must be suitable for the drive supply voltage.
IEC Fuse types
• IEC class gG - Full range breaking capability in general application. Slow acting.
• IEC class gR - Dual rated: semiconductor protection (ultra-fast acting) and cable protection.
• IEC class aR - Semiconductor Protection, fast acting. Provides no protection from slow, small overloads, so cable must be protected by using a
gG fuse or circuit breaker.
• HRC- High Rupturing Capacity – Denotes the ability of the fuse link to interrupt extremely high fault currents.
North American Fuse Types
• UL class J - Full range breaking capability in general application. Slow acting. Up to 600 V only.
Ferraz HSJ -High speed class J fuses. Dual rated: semiconductor protection (ultra-fast acting) and cable protection. Up to 600 V only and only from
Ferraz.
6.3.2 Unidrive M DC fusing and cable size ratings
DC bus fusing is required in the following systems for both the Regen and motoring drives, and the rectifier if used as the external soft start circuit.
1. Single Regen, multiple motoring drives
2. Multiple Regen, multiple motoring drives
3. Unidrive M Regen brake resistor replacement
4. Regen systems using a rectifier
DC bus fuses as detailed following, must be installed in both the positive and negative branches of DC bus connections to each of the Regen and
motoring drives, and the rectifier if used as the external soft start circuit.
Ferraz have a range of DC fuses which could be used to provide the required protection, types (00 and 21) may be used.
00 - Fuse with no trip indicator installed
21 - Fuse installed with trip indicator
The DC bus voltage set-point on a 400 V Regen system (default) is set to 700 Vdc, this can be up to a maximum 800 Vdc. Therefore ensure the
selected DC bus fusing is of the correct voltage rating with regards to the DC bus voltage level (Pr 03.005 DC bus voltage set-point).
Model
Cable size (IEC) Cable size (UL)
mm
2
AWG or kcmil
Input
Input
Nominal Maximum Installation method Nominal Maximum
10204100 2 x 150 2 x 185 C 2 x 300 2 x 500
10404520 2 x 150 2 x 185 C 2 x 350 2 x 500
10502430 2 x 95 2 x 185 B2 2 x 3/0 2 x 500
10602480 2 x 95 2 x 185 B2 2 x 3/0 2 x 500
11406840 4 x 120 4 x 120 C 2 x 250 2 x 250
11503840 2 x 120 2 x 120 C 2 x 250
11604060 2 x 120 2 x 120 C 2 x 300 2 x 300
1142X400* 2 x 2 x120 2 x 2 x120 C 2 x 2 x 300
1162X380* 2 x 2 x120 2 x 2 x120 C 2 x 2 x 300
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