Terminal blocks, Ct polarity, Terminals and connectors be1-11 t – Basler Electric BE1-11t User Manual
Page 224
212
9424200995 Rev H
Figure 165. Rear-Panel Connections with Fiber Optic Ethernet
Terminal Blocks
J-style cases use two sizes of terminal blocks.
The terminal blocks used for current sensing connections use #8-32 screws with lock washers. The lock
washer is an integral part of the current-sensing wiring system and must not be removed. Without the lock
washer, the terminal screw may bottom out and prevent a tight fit against the lug. The torque applied to
the terminal screws should not exceed 15 inch-pounds (1.69 N
•m). Each terminal block screw
accommodates a lug no wider than 0.344 inches (8.6 millimeters).
All other terminal blocks use #6-32 screws. The torque applied to these screws should not exceed 12
inch-pounds (1.35 N
•m). Each terminal block screw accommodates a lug no wider than 0.320 inches (8.1
millimeters).
CT Polarity
CT polarity is critical to the proper operation of the BE1-11t. The following provides fundamental
information on CT polarity and protection systems.
By ANSI convention, current transformer polarity will face away from the protected winding of a
transformer, motor, generator, or reactor, and away from the contacts in a circuit breaker. Therefore,
primary current flow towards the winding or contacts (direction of protected zone) will result in a
secondary current out X1, in phase with the primary (see Figure 166 and Figure 167).
!
WARNING
BE1-11
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C13
C14
C15
C16
C17
C18
V
A
OUT 2
OUT 3
OUT 4
OUT 5
OUT 1
ALARM
V
B
V
C
V
X
V
X
N
E12
E11
E10
E9
E8
E7
E6
E5
E4
E3
E2
E1
OUT 8
OUT 7
IN5
IN6
IN7
OUT 6
A8
A7
A6
A5
A4
A3
A2
A1
IRIG
PWR
C
A
B
RS-485
GND
B8
B7
B6
B5
B4
B3
B2
B1
IN1
IN2
IN3
IN4
D1
D3
D5
D7
IA1
IB1
IC1
IG1
IA1
D2
D4
D6
D8
IB1
IC1
IG1
IA2
F2
F4
F6
F8
IB2
IC2
IG2
F1
F3
F5
F7
IA2
IB2
IC2
IG2
ETHERNET
TX
RX
P0061-46
Terminals and Connectors
BE1-11t