Daikin AKZ8 Series, Instruction Manual

Page: 21 / 44

19
Bef
ore
Operation
Handling
Oil tank
Inlet oil temperature thermistor (To “
∗
1” point)
Outlet oil temperature thermistor (To “
∗
2” point)
Returned oil temperature thermistor (optional)
(To “
∗
3” point)
Room temperature thermistor
(To “
∗
4” point)
Machine temperature tuning
thermistor (Th5) (optional)
(To “
∗
5” point)
Control board
Intak
e air
Exhaust air
∗
4
∗
2
∗
1
B D
A
C
Condenser
Ev
apor
ator (Cooler)
Pressure reducing
mechanism
(Refrigerant)
Room temperature (Th3)
Inlet oil temperature
(Th4)
Machine
temperature
(Th5)
Outlet oil temperature
(Th2)
Returned oil
temperature
Fan
M
Compressor
(Refrigerant only)
(Refrigerant)
M
Oil pump
Oil inlet
Oil outlet
∗
5
∗
3
Machining center
(Oil)
(Oil)
Operation Setting
The Oil Cooling Unit operation setting provides the following modes.
Control method Setting range
Operation mode
∗
3
(Reference page)
Holding constant oil temperature
(Keeping a control target at a
constant temperature)
Fixed temperature
control
Reference
temperature
Control target
∗
1
Inlet oil temperature
Outlet oil temperature
Returned oil
temperature
∗
2
0 (p. 20)
1 (p. 20)
1 (p. 20)
5.0–50.0 (˚C)
5.0–50.0 (˚C)
5.0–50.0 (˚C)
Tuning oil temperature to room
temperature (or machine
temperature)
(Keeping a constant temperature
difference between the control target
and the reference temperature)
Cooling oil at constant capacity (%)
(Executes cooling operation according to capacity
command, but disables oil temperature control.)
Tuning temperature
control
Capacity direct
designation
(used for trial
run etc.)
Inlet oil temperature
Outlet oil temperature
Returned oil
temperature
∗
2
Inlet oil temperature
Outlet oil temperature
Returned oil
temperature
∗
2
3 (p. 21)
9 (p. 22)
5 (p. 21)
5 (p. 21)
–
9.9–9.9 (K)
0–100 (%)
–
9.9–9.9 (K)
–
9.9–9.9 (K)
4 (p. 21)
6 (p. 21)
6 (p. 21)
–
9.9–9.9 (K)
–
9.9–9.9 (K)
–
9.9–9.9 (K)
Room
temperature
None None
Machine
temperature
∗
2
The oil cooling system of the Oil Cooling Unit is as shown below.
System outline drawing
Description on the refrigerating cycle
∗
4
∗
1: For control target measuring points, see the figure below.
∗
2: Optional function using optional parts
∗
3: Operation modes 2, 7 and 8 cannot be used.
∗
4: K (Kelvin) is a symbol of the SI unit system that indicates a temperature difference (˚C).
A: The compressor produces high-temperature, high-pressure compressed gas so that the refrigerant gas can be easily cooled and liquefied
in the condenser.
B: The condenser cools and condenses the high-temperature, high-pressure gas produced in the compressor, to transform it to high-temperature,
high-pressure liquid.
C: The pressure reducing mechanism throttles the high-temperature, high-pressure liquid to reduce pressure, and transform it to low-temperature,
low-pressure liquid/gas mixture so that it can be easily evaporated in the evaporator.
D: The evaporator evaporates the low-temperature, low-pressure liquid/gas mixture produced in the pressure reducing mechanism by absorbing
heat from the oil (by cooling the oil), and transforms it to low-temperature, low-pressure gas.
PIM00116C_EN.fm 19 ページ ２００８年９月２９日 月曜日 午前１１時５１分