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Shenzhen Hpmont Technology Co., Ltd. Chapter 4 Electrical Installation
MONT72 Series User Manual V1.0 - 31 -
4.6.2 Wiring Requirement
In order to avoid interference intercoupling, it is recommended to separate the power supply cables,
motor cables and the control cables, and keep enough distance among them, especially when the
cables are laid in parallel and are long enough.
The signal cables should cross the power supply cables or motor cables, keep it perpendicular (90
° ) as
shown in Figure 4-19.
Distribute the power supply cables, motor cables and control cables in different pipelines.
Figure 4-19 System wiring
Shielded / armoured cable: High frequency low impedance shielded cable should be used.
For example: Copper net, aluminum net or iron net.
Normally, the control cables must use the shielded cables and the shielding metal net must be
connected to the metal enclosure of the controller by cable clamps as shown in Figure 4-20.
Figure 4-20 Shielded cable connection
4.6.3 Motor Connection
The longer cable between the controller and the motor is, the higher frequency leakage current will be,
causing the controller output current to increase as well. This may affect peripheral devices.
When the cable length is longer than 100 meters, it is recommended to install AC output reactor and
adjust the carrier frequency according to Table 4-13.
Table 4-13 Carrier frequency and the cable length between controller and motor
Cable length
< 30m 30 - 50m 50 - 100m ≥ 100m
Carrier frequency 15kHz below 10kHz below 5kHz below 2kHz below
The cross sectional area (CSA) of controller cables should refer to 4.2 Peripheral Accessories Selection,
on page 15.
The controller should be derated if motor cables are too long or their CSA is too large. The current
should be decreased by 5% when per level of CSA is increased. If the CSA increase, so do the current to
ground and capacitance.
Controller
Power supply cable
Power supply cable
Motor cable
Motor cable
Control cable Control cable 90°
>20 cm
90°
>50 cm
>30 cm
PE
PE
Enclosure Enclosure
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