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Unidrive M Regen Design Guide 43
Issue Number: 4
If K2 is installed in the position shown in Figure 4-4 then discharge resistors should be installed to the SFF Cap Bank A and where installed,
Cap Bank B. If K2 is installed on the supply side of Cap Bank A and Cap Bank B then a discharge resistor is not required. Refer to Table 10-35
Discharge resistor details for SFF capacitors to support 8 % THDv on page 300.
Where varistors other than those listed in Table 3-22 are fitted branch circuit protection may be required, where this is the case, follow the
manufacturers recommendations.
VDR1, VDR2 and VDR3 when operating with a 690 Vac supply should consist of two varistors each in series as detailed in Table 3-22 on page 38.
To prevent inductive voltage spikes surge suppressors should be fitted to the contactor coils.
The Regen inductor core losses are directly dependent on the switching frequency and specific core material and therefore selection is critical. As a
result only Regen inductors specified in this guide should be used.
SFF branch circuit protection may be required, refer to section 3.9.3 Switching frequency filter capacitor on page 30.
Ensure that cables from both capacitor banks to the fuses, where fitted, are of a similar length.
UVW
L1 L2 L3 PE
-DC +DC
-DC
+DC
21
1
2 3 4 5 6 7 8 9 10 11 41 42
22 23 24 25 26 27 28 29 30 31
T. 30
T. 24
S5
Mt.1
AC Supply
NOT USED
Motor
Connections
Motoring
drive DC
Connections
U
V
W
PE
S2
S3 S4
Drive enable
0common
Run forward
Run reverse
Motor thermistor
Unidrive M
Motoring drive
Drive reset
+24V output
0V common
V
Drive OK
Power feed forward
connections (optional)
see Optimization section
0V common
Power feed
forward O/P
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