Advanced Cooling Controller
User Manual
A Parameter Description
Issue Draft A (2014-12-26)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
71
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Parameter
Description
Default Value
than the anti-condensation
frequency drop temperature
difference.
Anti-cond freq
rise lim temp diff
When the supply air
temperature is lower than the
calculated dew-point
temperature at the return air
side, condensation may occur.
To avoid condensation, the
frequency of the compressor
frequency rise is limit when
the temperature difference
between the supply air and
dew-point is smaller than the
anti-condensation frequency
rise limit temperature
difference.
–5.0°C
Low limit for
speed shield
To avoid the resonance of the
compressor and pipes, the
resonant point should be
shielded. The parameter is the
low limit of the compressor
resonance frequency range.
Low limit for
speed 1 shield,
Low limit for
speed 2 shield,
Low limit for
speed 3 shield: 0
rpm
Low limit for
speed 4 shield:
3330 rpm
Low limit for
speed 5 shield:
3810 rpm
Upp limit for
speed shield
To avoid the resonance of the
compressor and pipes, the
resonant point should be
shielded. The parameter is the
upper limit of the compressor
resonance frequency range.
Upp limit for
speed 1 shield,
Upp limit for
speed 2 shield,
Upp limit for
speed 3 shield: 0
rpm
Upp limit for
speed 4 shield:
3390 rpm
Upp limit for
speed 5 shield:
3870 rpm
Startup LP
shielding time
When the system is started, the
system pressure is relatively
low. The precision air
conditioner will automatically
shield the low pressure
protection, which will be
180s