Terminal
Type
Attribute Function Remark
A/B/C
detecting
A/B/C three-phase 380VAC
Detecting A/B/C voltage and
phase sequence
Comm. port
RS485
A1/B1
Communication with MDI
Inverters of the main motor
and fan
RS485
A2/B2
Online or background
communication
Power input L/N
Controller power supply
input
220VAC
Table 2-2 There are 3 LEDs on panel, which are defined as follows:
LED Status Definition
POWER
Off The controller is powered down.
On The controller is powered on.
RUN
Off The screw compressor is shut down.
On The screw compressor runs.
Blink The compressor is in sleep mode.
ALARM
Off The compressor runs normally with no fault, or
fault has been cleared.
On Fault occurs to the screw compressor and an
alarm is given.
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