80
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Failsafe / Non-
failsafe
Allows you to select the actuation function of the relay.
When you select the
Non-failsafe
condition:
•
The normally closed and common contacts are shorted together if the
monitor is de-energized and the setpoints are not exceeded.
•
The relay changes states when the setpoints are exceeded.
When you select the
Failsafe
condition:
•
The normally closed and common contacts are shorted together
when the monitor is de-energized.
•
If the monitor is energized and the setpoints are not exceeded, the
relay changes states. This causes the normally open and common
contacts to be shorted.
•
If the setpoints are exceeded or if the monitor loses power, the
normally closed and common contacts are shorted together.
Important:
Qualitrol recommends setting any trip contacts for a
transformer to
Non-failsafe
. See the following table for
further clarification of Failsafe/Non-failsafe operation.
Relay
Condition
No Power to
Monitor
Monitor
Energized
< Set Point
Monitor
Energized
>= Set Point
Loss of Power
to Monitor
Non-failsafe
NC - C
NC - C
NO - C
NC - C
Failsafe
NC - C
NO - C
NC - C
NC - C
Test lock out
On / Off
When you press the
TEST
switch on the display panel of the 509ITM, the
monitor executes a test cycle of all the relays in the system. The test
actuates each relay for one second starting with relay one and finishing
with relay eight. The test continues until all the relays in all the relay
modules are cycled.
There might be situations when you do not want the relays to actuate. In
these situations, use the
Test Lock Out
switch function. By setting
Test
Lock Out
to ON when you press the
TEST
switch, the LED
corresponding to the relay illuminates, but the relay does not change
states.
Important:
Any relay wired to a trip function should have the Test
Lockout function set to ON.
Latching
•
On:
The relay remains in the actuated state even after the controlling
signal no longer exceeds the setpoint value. The relay can only be
released if you press the
RESET
switch while the controlling signals
do not meet the setpoint conditions.
•
Off:
The relay actuates and de-actuates according to the output of
the Control Signal Matrix table and other function settings.
Summary of Contents for 509ITM Series
Page 26: ...26 www qualitrolcorp com Current Input Wiring...
Page 55: ...55 www qualitrolcorp com 3 Continue with the setup procedure...
Page 101: ...101 www qualitrolcorp com...
Page 144: ...144 www qualitrolcorp com The following window will appear...
Page 167: ...167 www qualitrolcorp com The Customer Setup window displays 4 Click Load Tap Changer...
Page 178: ...178 www qualitrolcorp com Appendix...
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