Chapter
Ⅲ
Installation and Wiring
Page 14
3.2.1 Description of the terminals of frequency inverter
Description of the Main Circuit Terminals of Frequency Inverter:
Identification
Name
Function Description
R, S, T
（
L1, L2
）
AC input
3-phase (single-phase) AC input terminal,
connected to power grid
DC+, DC-
PV DC input
Input terminal of PV cell panel
U, V, W
Output of
frequency
Inverter
3-phase (single-phase) AC output terminal,
generally connected to the motor of water pump
Safe protection
earthing
Safe protection earthing terminal; each machine
must be earthed reliably
Description for -SS2 single-phase output models
1) Generally, the output terminals U and W of the inverter connect to the phase
cables of the single-phase motor.
2) If the single-phase pump cannot be started, the two-phase control method
must be used, and the start-up and running capacitors (if any) of the motor must be
removed. The figure below shows the internal wiring of the common single-phase
motor. In the figure, L1, L2, C1, and C2 indicate the running winding, start-up
winding, running capacitor, and start-up capacitor. When the motor speed exceeds
75% of the rated speed, the start-up capacitor is switched off.
U2
U1
L1
V2
V1
L2
C1
C2
L
N
Internal wiring of the single-phase motor winding after removing the starting
and running capacitor:
Summary of Contents for CDI-SPD Series
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