Eaton Rapid Link RAMO5, Manual

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6 RASP5 Speed controller
6.4 Special technical data
138
Rapid Link 5 · RAMO5 · RASP5 10/19 MN034004EN www.eaton.com
6.4.1 Overload Capacity
The variable frequency drive modules in the RASP5 speed control unit allow
for an overload cycle of 150 % I
e
for 60 s every 600 s of operation.
After the overload phase (150 % l
e
for 60 s or 200 % l
e
for 2 s), 100 %rated
current I
e can be continuously
recalled.
Figure 91: Overload cycle in operation
6.4.2 Derating curves
Although high pulse frequencies allow for low running noise and shorter
response times, they also produce higher losses at the power output stages,
as well as greater interference in the mains and motor cables. Because of
this, the pulse frequency should be set to the lowest possible value.
In expert mode (P1-14 = 101), the switching frequency can be changed in
parameter P2-22.
With higher pulse frequencies, the RASP5 heats up.
Therefore, the output current (I
2N
) must be reduced (derating) at high pulse
frequencies, depending on the ambient temperature.
I
150 % I
e
I
e
t
60 s
600 s
￫
For requirements for higher switching frequencies (> 16 kHz),
the load (output current) and/or the ambient temperature must
be reduced.
The RASP-FAN-S1 makes it possible to run the unit at higher
ambient temperatures.