Converteam ALSPA MV3DB Series, Manual

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2. Specifications MV3DB Series DB Units
ALSPA MV3000e Dynamic Braking Units (07/06)
Page 2-2
2.2 Duty Cycle
The rated Duty Cycle is 18 seconds ON per 3 minutes. This is illustrated in Figure 2-1.
During the 18 sec ON time, Nominal kW quoted in Table 2-1 should not be exceeded.
t2 =
162 seconds
OFF
t1 =
18 seconds
ON
Duty Cycle = t3 = 3 minutes
Repeat
Average Regenerative Power
Nominal kW
(Table 2-1)
2.3 Data Common to all DB Units
Table 2-3 Environment
Storage Altitude (maximum)
Temperature range
Relative humidity
3000 m
–25
o
C to +55
o
C (–13
o
F to +130
o
F)
5% to 95%, non-condensing
Transport Altitude (maximum)
Temperature range
Relative humidity
Vibration, drop
Overland 3000 m. Withstands air transport
pressurised to
≡
3000 m (maximum)
–25
o
C to +70
o
C (–13
o
F to +158
o
F)
≤
95%, non-condensing
IEC 60721-3-2 Class 2M1
Operating Altitude (maximum)
Temperature range
Relative humidity
Vibration
Cooling air
Ingress protection
Resistor acoustic
noise
1000 m, 1000 m to 2000 m with derating
0
o
C to 40
o
C (+32
o
F to +104
o
F);
40
o
C to 50
o
C (+104
o
F to +122
o
F) with derating
2.5% per
o
C. Refer to
Table 2-1
.
5% to 95%, non-condensing
IEC 60721-3-3 Class 3M1 & EN50178
As per drive
IP20 when fitted
< 70 dB(A)
Figure 2-1 Rated braking duty cycle