GE 845 User Manual

CHAPTER 2: INSTALLATION ELECTRICAL INSTALLATION
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–27
Table 2-8: Slots F,G,H with I/O options A,A,F (left) and I/O options A, N, F (right)
Serial Communications
One two-wire RS485 port is provided. Up to thirty-two 8 Series IEDs can be daisy-chained
together on a communication channel without exceeding the driver capability. For larger
systems, additional serial channels must be added. Commercially available repeaters can
also be used to add more than 32 relays on a single channel. Suitable cable should have a
characteristic impedance of 120 ohms and total wire length should not exceed 1200
meters (4000 ft).
Voltage differences between remote ends of the communication link are not uncommon.
For this reason, surge protection devices are internally installed across all RS485
terminals.Internally, an isolated power supply with an opto-coupled data interface is used
to prevent noise coupling.
Slots F,G,H with I/O options A,A,F Slots F,G,H with I/O options A,N,F
Terminal # SLOT F SLOT G SLOT H Terminal # SLOT F SLOT H
1 RELAY_1 RELAY_9 Digital In_15 1 RELAY_1 Digital In_8
2 RELAY_1 RELAY_9 Digital In_16 2 RELAY_1 Digital In_9
3 RELAY_1 RELAY_9 Digital In_17 3 RELAY_1 Digital In_10
4 RELAY_2 RELAY_10 Digital In_18 4 RELAY_2 Digital In_11
5 RELAY_2 RELAY_10 Digital In_19 5 RELAY_2 Digital In_12
6 RELAY_2 RELAY_10 Digital In_20 6 RELAY_2 Digital In_13
7 RELAY_3 RELAY_11 Digital In_21 7 RELAY_3 Digital In_14
8 RELAY_3 RELAY_11 Digital In_22 8 RELAY_3 Digital In_15
9 RELAY_3 RELAY_11 Digital In_23 9 RELAY_3 Digital In_16
10 RELAY_4 RELAY_12 Digital In_24 10 RELAY_4 Digital In_17
11 RELAY_4 RELAY_12 Common 11 RELAY_4 Common
12 RELAY_4 RELAY_12 +24V 12 RELAY_4 +24V
13 Digital In_1 Digital In_8 ARC
FLASHSensor
1Sensor
2Sensor
3Sensor 4
ARC
FLASHSensor
1Sensor
2Sensor
3Sensor 4
14 Digital In_2 Digital In_9 14 Digital In_2
15 Digital In_3 Digital In_10 15 Digital In_3
16 Digital In_4 Digital In_11 16 Digital In_4
17 Digital In_5 Digital In_12 17 Digital In_5
18 Digital In_6 Digital In_13 18 Digital In_6
19 Digital In_7 Digital In_14 19 Digital In_7
20 Common Common 20 Common
21 +24V +24V 21 +24V
22 RELAY_8 RELAY_16 22 RELAY_8
23 RELAY_8 RELAY_16 23 RELAY_8
24 RELAY_8 RELAY_16 24 RELAY_8

GE 845 Specifications

General

Brand	GE
Model	845
Category	Protection Device
Language	English