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CHAPTER 6: SETPOINTS
Output Relays -
Breaker - Input/
Output "R"
Output Relay 1 "Breaker Trip" - Input/Output "R"
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
When the setting
S2 SYSTEM SETUP > SWITCHING DEVICE
output relays function as:
Output Relay 1: Breaker Trip
Output Relay 2: Breaker Close
Output Relay 3: Start Inhibit
Output Relay 4: Critical Failure
These four special purpose relays have fixed operating characteristics:
Breaker Trip: Seal-in
Breaker Close: Seal-in
Start Inhibit: Non-failsafe, Self-reset
Critical Failure: Failsafe, Self-reset
There are no configurable Auxiliary Relays in this case. Logic diagrams for each Output
Relay are provided for detailed explanation of their operation.
The logic of the BREAKER TRIP, BREAKER CLOSE, START INHIBIT, and CRITICAL FAILURE
relays with INPUT/OUTPUT Option 'R' is the same as for the other INPUT/OUTPUT options
(Option 'E'), with the exception that the CRITICAL FAILURE relay is assigned to Output Relay
4 instead of Output Relay 7, as shown below.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
SETPOINTS > S5 INPUTS/OUTPUTS > OUTPUT RELAYS > RLY 1 TRIP
SEAL IN TIME
Range: 0.00 to 9.99 s in steps of 0.01
Default: 0.04 s
This setting defines the time to be added to the reset time of the Relay 1 Trip output,
thus extending its pulse width. This is useful for those applications where the 52 contacts
reporting the breaker state are faster than the 52 contacts that are responsible for
interrupting the coil current.
BLOCK RLY 1 TRIP
For details see
Common
This setting defines a block to the Trip Output relay. When the selected input is asserted,
the Trip Output relay will be blocked.
setpoints.
S5 INPUTS/OUTPUTS
is selected as BREAKER, the four
6–159
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