Requirements Of Wiring Connection - Midea Aqua Tempo Super Series Technical & Service Manual

Aqua Tempo Super Series air cooled scroll chiller unit (50Hz) MCAC-ATSM-201606

13.3.3 Requirements of wiring connection

● No additional control components are required in the electric cabinet (such as relay, and so on), and the
power supply and control wires not connected with the electric cabinet are not allowed to go through the
electric box. Otherwise, electromagnetic interference may cause failure of the unit and control components
and even damages to them, which thus lead to protective failure.
● All cables led to the electric box should be supported independently but by the electric box.
● The strong current wires generally pass the electric box, and 220V alternating current may also pass the
control board, so wiring connection should conform to the principle of separation of strong current and weak
current, and the wires of power supply should be kept more than 100 mm away from the control wires.
● Only use 380-415V 3Ph~ 50Hz rated power supply for the unit, and the maximum allowable range of
voltage is 342V-418V.
● All electric wires must conform to local wiring connection norm. The suitable cables should be connected
to power supply terminal through wiring connection holes at the bottom of the electric cabinet. According to
Chinese standard, the user is responsible for providing voltage and current protection for the input power
supply of the unit.
● All power supplies connected to the unit must pass one manual switch, to ensure that the voltages on all
nodes of electric circuit of the unit are released when the switch is cut off.
● The cables of correct specification must be used to supply power for the unit. The unit should use
independent power supply, and the unit is not allowed to use the same power supply together with other
electric devices, to avoid over-load danger. The fuse or manual switch of the power supply should be
compatible with working voltage and current of the unit. In case of parallel connection of multiple modules,
the requirements of wiring connection mode and configuration parameters for the unit are shown in the
following figure.
● Some connection ports in the electric box are switch signals, for which the user needs to provide power,
and the rate voltage of the power should be 220-230V AC. The user must be aware that all power supplies
they provided should be obtained through power circuit breakers (provided by the user), to ensure that all
voltages on the nodes of the provided power supply circuit are released when the circuit breakers are cut off.
● All inductive components provided by the user (such as coils of contactor, relay, and so on) must be
suppressed with standard resistance-capacitance suppressors, to avoid electromagnetic interference, thus
leading to failure of the unit and its controller and even damages to them.
● All weak current wires led to the electric box must apply shielded wires, which must be provided with
grounding wires. The shield wires and power supply wires should be laid separately, to avoid
electromagnetic interference.
● The unit must be provided with grounding wires, which are not allowed to be connected with the grounding
wires of gas fuel pipelines, water pipelines, lightning conductors or telephones. Improper earth connection
may cause electric shock, so please check whether earth connection of the unit is firm or not frequently.
Note: 25/35/65/80/130kW module only 16 scroll units can be combined at most.
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