GE 339

6–156 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
S5 INPUTS/OUTPUTS CHAPTER 6: SETPOINTS
trip relay to be failsafe and wire the contactor to the Normally Open trip relay terminals,
referring to Figure 40, below. When control power is lost to the 339 , the contactor will trip
to ensure maximum protection. If process considerations are more important than
protection, program non-failsafe and wire the contactor to the Normally Close trip relay
terminals, referring to Figure 39 below. When control power to the 339 is lost, no protection
is available and the motor will continue to run. This has the advantage that the process will
not shut down, however the motor may be damaged if a fault develops under these
conditions.
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 4 TRIP
RELAY OPERATION
Range: Non-Failsafe, Failsafe
Default: Non-failsafe
Figure 6-68: Contactor: Wiring for Start Inhibit and Trip (Non-failsafe)
Figure 6-69: Contactor: Wiring for Start Inhibit and Trip (Failsafe)
Auxiliary Output Relays 5 to 6 - Input/Output “E”
When the setting S2 SYSTEM SETUP > SWITCHING DEVICE is selected CONTACTOR, there are
2 output relays (Output Relay 5 to 6) available for customer specific requirement. Each
auxiliary relay can be selected as either Self-Reset or Latched. If the Self-Reset type is
selected, the output relay will be energized as long as the element is in operating mode
and will reset when the element drops out. If the Latched type is selected, the output relay
will stay energized, after the element dropout, and will be de-energized upon the reset
Control Power
START
START INHIBIT
(Output Relay 3:
Non-fail safe)
Close
Coil
896842.cdr
STOP
TRIP
(Output Relay 4:
Non-fail safe)
Motor Seal-in
Contact
Control Power
START
START INHIBIT
(Output Relay 3:
Fail safe)
Close
Coil
896843.cdr
STOP
TRIP
(Output Relay 4:
Fail safe)
Motor Seal-in
Contact