En-18
12.
OPERATIONS
12.1. Analog external inputs
CAUTION
• 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.
Analog inputs
adjustment dial
Connected unit
Power supply
DC 5V
Terminal block
PC board
VR700
Control unit (DX-kit)
VR700
• 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
Control unit
(DX-kit)
Analog signal
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.
a) Using the inlet to control the temperature
b) Using the outlet to control the temperature
30°C
30°C
25°C
28°C
18°C
4.2 V
2.6 V
3.8 V
8.2 V
7.0 V
9.0 V
1.0 V
9.0 V
10°C
14°C
17°C
Cooling
Cooling
Input voltage
Operation
temperature
Operation
temperature
Input voltage
Input voltage
Input voltage
Heating
Heating
(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
Input voltage
Required operation
performance
1.3 V
8.9 V
100%
5%
9381279005_IM.indb 18
9381279005_IM.indb 18
6/30/2014 11:31:19 AM
6/30/2014 11:31:19 AM
