Applications
GARD 8000 SYS RFL Electronics
May 1, 2013 2-10 973.334.3100
2.4 GARD 8000 BASE SYSTEM
The Base System consists of a chassis with Power Supply, a Controller Module and a Display With
TPS Module. While this system will provide the functionality of a digital teleprotection system, order
specific inputs and outputs need to be added.
2.4.1 POWER SUPPLY
The GARD 8000 Power Supply comes in two versions:
Wide range: 48/125 Vdc or 115 Vac
250 Vdc: 220/250 Vdc or 230 Vac
24 Vdc 19 – 29 Vdc Only
One power supply is able to take the total load of a fully populated chassis. When a redundant power
supply is included they are connected in parallel. The load is mainly carried by one of the supplies
while the other operates as stand-by. Being connected in parallel, there is no switching-over period in
case one of them fails; the load is automatically taken over by the redundant supply.
When two power supplies are used in the same chassis, each supply can use different input power
sources.
2.4.2 SYSTEM ALARM RELAYS
The power supply rear panel is provided with two system alarm relays. These are provided with both
Form A and Form B contacts as indicated on the rear panel screw terminal block. All individual
modules provide Minor and Major Alarms. A Minor Alarm is a non-critical condition, when the
module is still operational. An example of this is the failure of one of the two power supplies in the
same chassis. A Major Alarm is issued from the module for conditions that cause it to become non-
operational.
2.4.2.1 MAJOR ALARM
One of the two alarm relays is used for Major Alarms. Each module is capable of producing Minor and
Major Alarms and it is selectable whether these alarm conditions should produce a Minor and/or Major
System Alarm, and operate the output contact. The Major Alarm contacts are located on the rear of PS
1 module (Power Supply 1).
2.4.2.2 MINOR ALARM
The second of the alarm relays is used for Minor Alarms. Each module is capable of producing Minor
and Major Alarms and it is selectable whether these alarm conditions should produce a Minor and/or
Major System Alarm, and operate the output contact. The Minor Alarm contacts are located on the rear
of PS 2 module (Power Supply 2).
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