Technical Data
51
6.3.4 Operational
Limits
in
Conjunction with Mains Supply
A mains power supply voltage of 115 VAC or below limits the maximum
possible output power of the
CMC 353
.
In order to increase the output power when operated with a mains power
supply voltage of
≤
115 VAC, you can supply the
CMC 353
from two phases
(L-L) rather than from the normal one phase-neutral (L-N). This increases
the power supply by the factor
√
3 (115 VAC *
√
3 = 200 V).
To limit the internal losses and to maximize the output power of the voltage
amplifier, always set the maximum test object voltage to the minimum value
possible for the test.
Table 6-8:
Typical total output power
at low mains power supply
voltages
6.3.5
Operational Limits with Current and Voltage Amplifier in
Parallel
A parallel operation of current and voltage amplifier lowers the maximum
output power of the
CMC 353.
To limit the internal losses and to maximize the output power of the voltage
amplifier, set the maximum test object voltage to the minimum value
possible for the test. To minimize no-load losses, do not route unused
amplifiers in the
Hardware Configuration
.
Table 6-9:
Typical test set uptime for
different output powers
when operating at an
ambient temperature of
23 °C
Mains
1
1
At an ambient temperature of 23 °C, after 10 min of continuous operation at full output
power, allow a duty cycle of 10 min on/10 min off.
Current amplifier
Voltage Amplifier
AUX DC
115 V
3 x 250 W @ 20 A
3 x 85 W @ 85 V
45 W @ 110 V
100 V
3 x 200 W @ 20 A
3 x 85 W @ 85 V
45 W @ 110 V
90 V
3 x 150 W @ 20 A
3 x 85 W @ 85 V
45 W @ 110 V
Current amplifier
Voltage Amplifier
t1
1
1
t1 = maximum possible uptime for a cold
CMC 353
test set.
3 x 200 W @ 20 A
3 x 60 W @ 85 V
> 1800 s
2
2
At an ambient temperature of 23 °C, when operating the
CMC 353
test set with a low mains
power supply, allow a duty cycle of 10 min on/10 min off.
3 x 250 W @ 20 A
3 x 85 W @ 85 V
600 s
3 x 430 W @ 20 A
3 x 100 W @ 85 V
500 s
Summary of Contents for CMC 353
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