CHINT DTSU666 - Page 5

PT Ratio Setup Guide
1. Initial interface after power
on
2. Press ‘SET’ for 3s to enter
the password input interface
3. Press ‘SET’ and ‘➡’ to enter
the password (default 701)
4. Press ‘SET’ for 3s to
enter the setting interface
5. Press ‘➡’ to PT 6.Press ‘SET’ to enter PT set，
the default PT is 1.0
7.Press ‘SET’ and ‘➡’ to
change PT value
8. Press ‘ESC’ to save value and
quit PT set, press ‘ESC’ again to
back to initial interface
SET ESC
SET ESC
SET ESC
SET ESC
SET ESC
SET ESC
SET ESC
SET ESC
Sampling Voltage ＞ 480Vac
(3P3W)
Wiring Guide
Notes：
1. Sampling voltage ＞480Vac, please refer to the guide to wire, setup the wiring mode and PT
ratio
2. Please ensure that the CT wiring is correct, and ensure that the voltage sampling and CT wiring
on different phase lines (regardless of phase sequence) meet the corresponding relationship in
the table below.
3. Make sure the direction of the arrow on CT point from grid to load.
4. Voltage sampling needs to be through the PT. In order to prevent short circuit at the PT
secondary side, a fuse is needed to be connected in series for protection.Recommended fuse
specifications: ≥ 100V/1A
Voltage sampling and CT port wiring table
L1 (CT1)
L2
L3 (CT2)
Voltage sampling
2
10
8
CT+ (I*a/I*b/I*c)
1
7
CT- (Ia/Ib/Ic)
3
9
I
*
c
Ic
I
*
a
Ia
(B lue)
(B lue)
(Whit e)
(Whit e)
1 4 7 10
32 35
24 2 5
38 1 1 1 22 5 8
3 9 106
SET ESC
L2
L2
32 35 38 11 122 5 8
3 9 10
6
L2
1 4 7 10
2 4 2 5