Fail Over Sequence; Required Components - GE Multilin G500 Instruction Manual

Fail over sequence

Required components

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G500 redundancy requires two G500 units and zero, one, or two RS232 switch panels.
The RS-232 switch panel is optional for Warm and Hot Standby redundancy.
Using the redundancy configurations given in this section, a pair of LEDs on the RS232
switch panel marked CCU A and CCU B indicate which of the G500 units is currently active.
If the hardware or software of the active unit fails, it is automatically switched offline and
serial connections to the field are transferred to the standby unit. A toggle switch on the
RS232 switch panel can be used to manually switch the G500 devices between active and
standby modes.
If the active G500 unit fails, the following actions occur:
1. The standby G500 unit detects the failure through the lack of a heartbeat signal on the
ping cable or through a status change on the watchdog cable.
2. The standby G500 unit attempts to pull the RS232 switch panel to assume the active
state.
3. The RS232 switch panel transfers all serial field connections to the standby G500,
which then becomes the active G500.
To implement a redundant G500 system, you need the following components
Component Function
RS232 Switch Panel Communications switch.
Power Supply Power supply to power the RS232 switch panel.
Input: 85 – 264 VAC or 90 – 350 VDC.
Watchdog Cable Connects G500 A to the RS232 switch panel.
Assembly
Connects G500 B to the RS232 switch panel.
Ping Cable Assembly Links both G500 units to facilitate a heartbeat message
that determines the status of the active unit.
G500 RJ45 to RS232 Connects the G500 to the RS232 switch panel which is
Serial Cable then connected to external field devices.
Power/SysFail Cable Connects the RS232 switch panel to an external power
supply and to the G500 SysFail terminal block.
Ground Cable Provides a ground connection for the RS232 switch panel. 970-0182
*An RJ45 to DB9 cable (977-0556) is required to convert the G500 RS232 ports to DB9.
(/LLL) is length of the cable in inches, i.e. 36inches is /036.
The serial ports on the G500 are galvanically isolated from each other, however, when the
RS232 switch panel is used, the serial common of all ports are tied together.
Pins 4 on switch panel connectors J2 through J9 are tied together and to the panel's power
supply. Any loading from field devices on these pins, loads the RS232 panel power supply
and should be taken into consideration when sizing power supplies.
The G500 watchdog (control) port must be configured for port 4 or 8 on the Built-in ports or
port 4 on the Expansion port. The watchdog (control) must be configured to be the same
port number on both G500A and G500B.
GE INFORMATION
CHAPTER 3: INSTALLING THE G500
G500 SUBSTATION GATEWAY INSTRUCTION MANUAL
:
GE part
number
517-0247
580-0046
977-0540
977-0556*
977-0541
977-0556*
977-0559/LLL
977-0556/LLL
970-0161