Fujitsu AJ 126LELDH Series Design & Technical Manual page 770

Item
NOTES:
• *1: Number of twist is not specified. However, it shall satisfy the electrical specifications such as
characteristic impedance, attenuation, etc. (Example: More than 40 times/m)
• *2: Cross talk attenuation is applied when the twisted cable has 2 pairs (2 P).
• Material is not specified. However, it shall be selected by considering the operating environment
(temperature, humidity) and the local regulation by the environment condition (ROHS directive, etc.).
• Mechanical specification is not specified. However, it shall be selected by considering the operating
environment.
• Never bundle transmission cable with power supply cable.
¢ Wiring rules
• In the following cases, Signal amplifier is required.
– When the total length of the transmission cable exceeded 500 m
AB + BC + BD + DE + EF > 500 m (Fig. 1)
– When total number of the units is over 64.
• When the total length of the transmission cable exceeded 500 m
• Transmission cable length between each unit: 400 m
• Total transmission cable length: 3,600 m (Fig. 2)
Terminal
resistor
Outdoor unit
B
A
D
Indoor unit
When AB + BC + BD + DE + EF > 500 m,
signal amplifier is required.
NOTE: For details of maximum wiring length, refer to
4-3. Transmission cable
Reference specifications for transmission cable
Unit
Fig. 1
Transmission cable
System
C
controller
E F
Touch
panel
controller
- (06-56) -
Specifications
Fig. 2
Terminal
resistor
Outdoor unit
A
Transmission cable
B
D
Terminal resistor
E
G
NS 3
Indoor unit
"VRF network system"
NS 1
Touch
panel
C
controller
NS 2
System
F
controller
NS 4
H
Signal amplifier
on page 06-4.
4. Wiring design