VECTORDRIVE DSV 5444 Top technology in drive electronics
07.07.04 10:12 Dietz-electronic page 9 of 60
3.3.1 Mains fuses and power chokes
The unit feeder must be fused and fitted with power chokes to attenuate phase effects. The core of the power
choke should be earthed.
The design of fuses and chokes should be determined on the basis of the table below. The minimum cross-
section of the mains feeder is dictated by the mains fuse and type of installation.
VECTORDRIVE DSV
5444-
Mains fuse
3x (time-lag)
Power choke
3x 4% uk[mH]
3..6 (S/L) 6 A 2,40 - 10 A
9 (S/L) 16 A 2,40 - 10 A
12 (S/L) 16 A 0,70 - 35 A
16 (S/L) 25 A 0.70 - 35 A
25 (S/L) 35 A 0,70 - 35 A
32 (S/L) 50 A 0,70 - 35 A
45 (S/L) 63 A 0,50 - 50 A
60 (S/L) 80 A 0,50 - 50 A
80 (S) 100 A 0,30 - 80 A
80 (L) 125 A 0,30 - 80 A
100 (S/L) 125 A 0,25 -100 A
130 (S/L) 160 A 0,20 -120 A
S = Standard L = Lift version
3.3.2 Operation with leakage current safety device
It is only possible to use leakage current safety devices (F1) in conjunction with frequency inverters in certain
circumstances. Check national standards to see whether a leakage current safety device is admissible for
your application. In the event of a fault, DC currents can occur on the mains side with frequency inverters.
You should therefore only use leakage current safety devices suitable for DC leakage currents.
Mains filters under some operating conditions (e.g. failure of one phase) can cause high discharge current,
resulting in spurious tripping of the safety device. Switching devices on the mains side, such as mains switch
or fuse, must therefore switch symmetrically. Rotary switches are generally unsuitable for use with mains
filters.
3.4 Motor connection
The motor phases U, V, W are connected to the terminals U1, U2, U3 on the underside of the frequency
inverter. The motor housing should be earthed, e.g. to the additional PE terminal. Make sure that the phase
sequence is maintained for clockwise phase sequence, otherwise the motor will turn to the left for positive
setpoint values. The line cross-sections of the motor feeder are dictated by the rated current of your fre-
quency inverter. Only use screened motor feeders if no output filter or add-on filter is used.
Operating with low speeds and high motor currents causes serious overheating of the motor. It may be that
self-cooling or self-ventilation are no longer sufficient. In this case the motor must be fitted with an external
fan and temperature sensor (thermistor).
With parallel operation of several motors with one inverter, the cumulative motor current must not exceed the
rated equipment current.
If the motor is operated above its rated frequency (standard 50 Hz motor), check the limit speed. Ask your
motor manufacturer if in doubt.
