3.3.5 Switching frequency and temperature
Unit size
12
13
14
Rated switching frequency
1)
f
SN
/ kHz
8
8
4
Max. switching frequency
1)
f
S_max
/ kHz
16
16
16
Max. heat sink temperature
T
HS
/ °C
90
80
Temperature for derating the switching frequency
2)
T
dr
/ °C
80
70
temperature for uprating the switching frequency
2)
T
ur
/ °C
70
50
Temperature for switching to rated switching frequency
2)
T
em
/ °C
85
75
Table 18:
Switching frequency and temperature
1)
The output frequency is to be limited in such a way that it does not exceed 1/10 of the switching
frequency.
2)
On reaching the temperature T
dr
the switching frequency is step down. The switching frequency
is increased again on cooling down to temperature Tur.
If derating is not requested in individual cases, the function can be deactivated via software.
The drive converter cooling is designed by way that the heat sink overtemperature
threshold is not exceeded at rated conditions. A switching frequency higher than the rat-
ed switching frequency also produces higher losses and thus a higher heat sink heating.
If the heat sink temperature reaches a critical threshold (
T
dr
)
the switching frequency
can be reduced automatically step by step, in order to prevent that the drive converter
switches off due to overheating of the heat sink. If the heat sink temperature falls be-
low
T
ur
, the switching frequency is increased to the setpoint again. At temperature
T
em
the switching frequency is immediately reduced to rated switching frequency. „Derating“
must be activated, for this function to work.
3.3.6 Protection of the drive converter
Unit size
fuse in A
Alternatively Motor
protection switch
U
N
= 400V
gG (Iec)
U
N
= 480V
class „cc“ (UL)
U
N
= 480V
class „J“ (UL)
eaton
PKZM0 32-e (UL)
Sccr 30 kA
Sccr 30 kA
Sccr 5 kA
Sccr 5 kA
12
16
15
15
480Y/277V, 20 HP
13
20
20
20
14
25
25
25
—
Unit size
fuse in A
Alternatively Motor
protection switch
U
N
= 230V
gG (Iec)
U
N
= 200-230V
class „cc“ (UL)
U
N
= 200-230V
class „J“ (UL)
eaton
PKZM0 32-e (UL)
Sccr 30 kA
Sccr 30 kA
Sccr 5 kA
Sccr 5 kA
12
16
15
15
200V, 7.5 HP
230V, 10 HP
13
20
20
20
14
25
25
25
—
Table 19:
Protection of the drive converter
Short-circuit-capacity
and
the following is valid for
the connection to mains: The units are suitable for use in a circuit capable
of delivering not more than 30 kA eff. unaffected symmetrical short-circuit
current.
36
UNIT DATA
Summary of Contents for COMBIVERT S6 Series
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