Fujitsu UTP-VX90A Installation Manual - Page 19

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Fujitsu UTP-VX90A Installation Manual

12. OPERATIONS

12.1. Analog external inputs

• Use an insulated screwdriver to set the adjustment dial.
• Do not apply voltage greater than 10V.
The operation temperature and required operation performance are set by changing the
voltage of the signals entered to "analog external inputs". Compensating the analog circuit
tolerance before using this function is recommended.
(1) Initial settings for using the analog external inputs circuit.
Set the DIP switch SET3-1 to "ON".
Set the DIP switch SET3-2 to "OFF".
(2) Compensate the tolerance of the circuit that measures the voltage of the analog input
signals.
Connected unit
Power supply
DC 5V
• Compensation method
i) Connect the power supply adjusted to output DC 5V to the designated terminal.
ii) Turn ON the power supply.
iii) Use the adjustment dial to compensate so that the temperature display for the wired
remote controller indicates 20°C.
(3) Setting the operation temperature using analog external inputs
Connected unit
Connected
device
The operation temperature is set by changing the voltage of the input signals.
(• If using this function, set the DIP switch SET3-2 to "OFF".)
Formula: Operation temperature T (°C)=2.5 × Ain + 7.5
Ain= Input voltage (1.0 to 9.0V)
See the following diagram for the advanced input conditions.
CAUTION
Control unit (DX-kit)
PC board
Terminal block
VR700
Analog inputs
adjustment dial
VR700
Control unit
(DX-kit)
Analog signal
a) Using the inlet to control the temperature
Cooling
30°C
18°C
4.2 V
9.0 V
Input voltage
b) Using the outlet to control the temperature
Cooling
25°C
14°C
2.6 V
7.0 V
Input voltage
(4) Setting required operation performance using analog external inputs
• The operation capacity can be set by changing the voltage of the input signals.
* Refrigerant cycle protection is prioritized, so operation may not be as required.
• If using this function, set the DIP switch SET3-2 to "ON".
Formula: Required operation performance C(%)=12.5 × Ain - 11.25
Ain= Input voltage (1.3 to 8.9 V)
If Ain<1.3 V, C=0% fi xed
If Ain>8.9 V, C=100% fi xed
100%
5%
1.3 V
8.9 V
Input voltage
Heating
30°C
10°C
1.0 V
9.0 V
Input voltage
Heating
28°C
17°C
3.8 V
8.2 V
Input voltage
En-18