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SiEN12-710A
Control Specification
Function and Control
43
2.2 Frequency Control
Outline
Frequency that corresponds to each room’s capacity will be determined according to the
difference in the temperature of each room and the temperature that is set by the remote
control.
The function is explained as follows.
1. How to determine frequency.
2. Frequency command from an indoor unit. (The difference between a room temperature and
the temperature set by the remote control.)
3. Frequency command from an indoor unit. (The ranked capacity of the operating room).
4. Frequency initial setting.
5. PI control.
Detail
How to Determine Frequency
The compressor’s frequency will finally be determined by taking the following steps.
For Heat Pump Model
1. Determine command frequency
$
Command frequency will be determined in the following order of priority.
1.1 Limiting frequency by drooping function
$
Input current, discharge pipes, low Hz high pressure limit, peak cutting, freeze prevention,
dew prevention, fin thermistor temperature.
1.2 Limiting defrost control time
1.3 Forced cooling
1.4 Indoor frequency command
2. Determine upper limit frequency
$
Set a minimum value as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipes, Low Hz high pressure, peak cutting,
freeze prevention, defrost.
3. Determine lower limit frequency
$
Set a maximum value as an lower limit frequency among the frequency lower limits of the
following functions:
Four way valve operating compensation, draft prevention, pressure difference upkeep.
4. Determine prohibited frequency
$
There is a certain prohibited frequency such as a power supply frequency.
Comm
a
nd fre
qu
ency
Limit frequency
S
kip control
E
a
ch
u
pper limit f
u
nction
Compre
ss
or protection f
u
nction
E
a
ch lower limit f
u
nction
Fo
u
r-w
a
y v
a
lve oper
a
ting compen
sa
tion, etc. (*)
Initi
a
l fre
qu
ency
PI control
Defro
s
t control (*)
E
a
ch drooping f
u
nction
Inp
u
t c
u
rrent control, etc.
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Target frequency
Comm
a
nd fre
qu
ency X repe
a
t
s
when fre
qu
ency
b
ecome
s
lower
Fre
qu
ency ch
a
nge
s
b
y PI control < repe
a
t
s
when fre
qu
ency
b
ecome
s
lower
*: only for he
a
t p
u
mp model
(R1
3
75)
Summary of Contents for 2MKS40FV1B
Page 11: ...Introduction SiEN12 710A x ...
Page 12: ...SiEN12 710A List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 17: ...Heat Pump SiEN12 710A 6 List of Functions ...
Page 25: ...Heat Pump SiEN12 710A 14 Specifications ...
Page 111: ...Instruction SiEN12 710A 100 Operation Manual ...
Page 199: ...Wiring Diagrams SiEN12 710A 188 Appendix ...
Page 203: ...SiEN12 710A iv Index ...