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Unidrive SP Regen Installation Guide 53
Issue Number: 2 www.controltechniques.com
5.3.4 Switching frequency filter capacitors
Table 5-9 Switching frequency filter capacitors
Discharge resistors
PoleCap capacitors have a pre-mounted ceramic discharge module, all
other capacitor types (Windcap, Phasecap or PHI capacitors) can have
either three preformed discharge resistors or a pre-mounted ceramic
discharge module supplied with capacitors.
Figure 5-13 Discharge resistor arrangement
Cautions and warnings
In case of dents of more than 2 mm depth or any other mechanical
damage, capacitors must not be used at all.
To ensure the full functionality of the overpressure disconnector, elastic
elements must not be hindered and a minimum space of 5 cm has to be
kept above each capacitor.
Protection should be provided to prevent over current and short circuit.
Discharging
Capacitors must be discharged to a maximum of 10% of rated voltage
before they are switched in again.
The capacitor must be discharged to 75 V or less within 3 minutes.
There must be not any switch, fuse or any other disconnecting device in
the circuit between the power capacitor and the discharging device.
Over current and short circuit protection
Use HRC fuses or MCCBs for short circuit protection. Short circuit
protection and connecting cables should be selected so that 1.5 times
the rated capacitor current can be permanently handled.
HRC fuses do not protect a capacitor against overload - they are only for
short circuit protection.
The HRC fuse rating should be 1.6 to 1.8 times rated capacitor current.
Figure 5-14 3-phase PHIcap dimensions
3-phase capacitor
Pt No.
CN
(uF)
∅ x L
(mm)
Discharge resistor
(kΩ)
Weight
(kg)
Mounting
Max torque
(Nm)
Type No
1664-1074 3 x 7.0 53 x 114 390 0.3 M8 Stud 4 PHIcap
1664-2174 3 x 16.6 63.5 x 129 390 0.4 M12 Stud 10 PHIcap
1610-7804 3 x 8.0 75 x 210 390 0.5 M12 Stud 15 Polecap
1668-7833 3 x 8.3 116.2 x 204 390 1.2 M12 Stud 10 Windcap
1666-8113 3 x 11.2 116.2 x 204 390 1.3 M12 Stud 10 Windcap
1668-8163 3 x 16.6 116.2 x 204 390 1.2 M12 Stud 10 Windcap
1666-8223 3 x 22.5 116.2 x 204 390 1.4 M12 Stud 10 Windcap
1665-8324 3 x 32 116.2 x 204 390 1.1 M12 Stud 10 Phasecap
1665-8394 3 x 39 116.2 x 204 390 1.2 M12 Stud 10 Phasecap
1665-8484 3 x 48 116.2 x 204 390 1.3 M12 Stud 10 Phasecap
1664-2644 3 x 64 116.2 x 204 390 1.2 M12 Stud 10 Phasecap
1665-8774 3 x 77 116.2 x 204 390 1.8 M12 Stud 10 Phasecap
Ceramic discharge
m
l
Three preformed
resistors
Discharge Resistor
Arrangements
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