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CHAPTER 6: SETPOINTS
Output Relays -
Contactor - Input/
Output "E"
Output Relay 1 "Not Used" - Input/Output "E"
Output Relay 2 "Not Used" - Input/Output "E"
Output Relay 3 Start Inhibit - Input/Output "E"
Output Relay 4 Contactor Trip - Input/Output "E"
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
When the setting
S2 SYSTEM SETUP > SWITCHING DEVICE
seven output relays function as:
Output Relay 1: Not Used
Output Relay 2: Not Used
Output Relay 3: Start Inhibit
Output Relay 4: Contactor Trip
Output Relays 5 to 6: Auxiliary Relays
Output Relay 7: Critical Failure
There are three special purpose relays: Start Inhibit, Contactor Trip, and Critical Failure.
These relays have fixed operating characteristics:
Start Inhibit: Self-reset
Contactor Trip: Latched
Critical Failure: Self-reset, Failsafe
The user can configure an Auxiliary Relay as either Latched or Self-reset.
Output Relays 1 to 6 can be programmed to be in either Non-failsafe or Failsafe operation
mode.
Non-failsafe: the relay coil is not energized in its non-active state. Loss of control
power will cause the relay to remain in the non-active state; i.e. a non-failsafe trip
relay will not cause a trip on loss of control power.
Failsafe: the relay coil is energized in its non-active state. Loss of control power will
cause the relay to go into its active state; i.e. a failsafe trip relay will cause a trip on
loss of control power.
When the setting
S2 SYSTEM SETUP > SWITCHING DEVICE
output relay is not used.
When the setting
S2 SYSTEM SETUP > SWITCHING DEVICE
output relay is not used.
The Start Inhibit relay (Output Relay 3) is a form C contact with one Normally Open and one
Normally Close contacts. This relay can be programmed as either Non-failsafe or Failsafe
operation mode. Wiring of the Start Inhibit relay contacts will depend on the user's
selection of operation mode. If Non-failsafe operation is selected, wire the Normally Close
contact of Start Inhibit output relay to the contactor control circuit; if Fail-safe operation is
selected, wire the Normally Open contact to the control circuit.
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 3 START INHIB
RELAY OPERATION
Range: Non-Failsafe, Failsafe
Default: Non-failsafe
When the setting
S2 SYSTEM > SWITCHING DEVICE
trip is always issued as a latched operation. The Trip relay (Output Relay 4) can be
programmed as either Non-failsafe or Failsafe operation mode. Wiring of the Trip relay
contacts will depend on this configuration. For maximum motor protection, program the
S5 INPUTS/OUTPUTS
is selected as CONTACTOR, the
is selected as CONTACTOR, this
is selected as CONTACTOR, this
is selected as CONTACTOR, a protection
6–155
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