GE Industrial Solutions CPS6000 - Manual (Page 142)

CPS6000 –48V Indoor/Outdoor Power Shelf
Issue 21 January 2008
142
Ringer
Overview
Warning: The Ring signal shall be considered hazardous and shall be spaced from
other circuits by 0.055 in. (1.4 mm).
Ringers convert dc to ringing power. QS820A Ringers convert -48Vdc to a 100VA ringing
power output with configurable ac voltage, ac frequency, and dc offset. See Ringer
Specifications for details.
Output Isolation
Ringers have output relays that isolate their ringing output from the Ringer Chassis ringing
output in the event of standby operation, ringer failure, and output over-load. This facilitates 1
+ 1 redundant operation and the determination of external vs. internal faults.
Autonomous Operation
CPS6000 Controllers provide Ringer settings capability and status and alarms
communications. QS820 Ringers operate without CPS6000 Controller.
When Ringers are not communicating with a Controller they
• Continue to operate normally from settings stored in their non-volatile memory
• When two Ringers are installed in a Ringer Chassis, they continue to provide 1 + 1
redundant (duplex) operation.