Huawei EMMA Pro - Page 34

Item Name Type Conductor Cross-
Sectional Area
Source
RS485 RS485
communicati
ons cable
Two-core
outdoor shielded
twisted pair
cable
0.2 mm
2
to 1.5
mm
2
(0.5 mm
2
recommended)
Prepared
by the
customer
CT (Optional)
External CT
cable
Two-core or
multi-core
twisted pair
cable
0.2 mm
2
to 1.5
mm
2
(0.5 mm
2
recommended)
Prepared
by the
customer
DO DO signal
cable
Two-core or
multi-core
twisted pair
cable
0.2 mm
2
to 1.5
mm
2
(0.5 mm
2
recommended)
Prepared
by the
customer
12V_OUT 12 V output
cable
Two-core or
multi-core
twisted pair
cable
0.2 mm
2
to 1.5
mm
2
(0.5 mm
2
recommended)
Prepared
by the
customer
FE FE
communicati
ons cable
Cat 5e network
cable, internal
resistance ≤ 1.5
ohms/10 m
RJ45 connector
0.12 mm
2
to 0.2
mm
2
(0.2 mm
2
recommended)
Prepared
by the
customer
ANT (Optional)
External
WLAN
antenna
External antenna
with the RP-
SMA-J port
- Prepared
by the
customer
Table 5-2 Recommended external CT specications
Turn
Ratio
Accuracy Test Point Percentage at Rated Current
1% 5% 20% 100% 120%
≥
2000:1
0.2 Dierence
(%)
±0.40 ±0.20 ±0.20 ±0.20 ±0.20
Angle
dierence
(')
±30 ±15 ±10 ±10 ±10
NOTE
● Secondary side: 50 mA
● Primary side: N x 50 A ( N ≥ 2, and N is an integer)
● The external CT communications cables are shorter than or equal to 30 m and not
routed separately. It is recommended that the cables be routed through pipes.
EMMA-(A01, A02)
User Manual 5 Electrical Connections
Issue 05 (2024-01-19) Copyright © Huawei Digital Power Technologies Co., Ltd. 28