Table of Contents
Advertisement
CHAPTER 6: SETPOINTS
Critical Failure Relay #7 - Input/Output "E"
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 6-66: Auxiliary relays
The 339 relay is also equipped with one output relay (# 7 - "Critical Failure Relay") for fail-
safe indication. There are no user-programmable setpoints associated with this output
relay. The logic for this relay is shown below.
The Critical Failure Relay (Output Relay 7) is a form C contact (refer to the Typical Wiring
Diagram) with one Normally Open, and one Normally Closed contact (no control power).
Output Relay 7 is energized or de-energized (state change) depending on the following
conditions:
1.
Output Relay 7 will be de-energized, if the relay is not in IN-SERVICE mode or the
control power is not applied to the relay
S5 INPUTS/OUTPUTS
6–153
Advertisement
Table of Contents
