HBD PV500-0007M1 User Manual page 20

PV500 series solar pumping inverters
3.2.2 Terminals of control circuit
Category
Power supply
Digital input
Functions of control terminals
Terminal
Terminal name
symbol
24V 24V power supply
COM Common terminal
Forced switch to
DI1
power frequency
DI2 Full-water alarm
Empty-water
DI3
Single/two phase
DI4
It provides the power of
24V±10% and maximum current
of 200mA.
It functions as the working power
supply of digital input and output
or externally connects to the
sensor power supply.
Terminal feature parameters:
1. Internal impedance: 3.3kΩ
2. Acceptable voltage input:
12~24V
3. Maximum input frequency:
1kHz
DI1: Forcible switch to power
frequency (Switching-on indicates
switching to power frequency, and
switching-off indicates input
controlled by the keypad.)
DI2: It connects to the high-
alarm
water switch of the normally
open contact by default.
DI3: It connects to the low-water
switch of the normally closed
contact.
algorithm
DI4: A high electrical level
switching
corresponds to the single-phase
algorithm. A low electrical level
corresponds to the two-phase
algorithm.
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Installation guidelines
Terminal function