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RX Series
Digital Solid State Protection Relay 5 - 2000A
5.6.6 Lockout Features
F044 – F046 provide lockout protection for motors and equipment that
may have potentially damaging consequences from premature restart or
with limited duty cycles. Time and count values for these lockouts can
be viewed in F081 – F085. Time values are based on the Real Time
Clock and DO NOT reset when power is lost or disconnected.
Emergency clearing of lockouts can be accomplished in F071.
WARNING!
When F044 through F046 are used with 2-wire control, the starter
may re-start automatically when time has expired. Adequate
warnings similar to those in Section 3.1.3.b should be observed.
Figure 5.6.6:
Coast Down Lockout Timer
F044 = Coast Down Lockout Timer (Back Spin Timer)
Factory Setting = 0 (Disabled)
Range = 1 - 60 minutes, or 0 (Disabled)
F044 = 1 through 60 sets the number of minutes that the starter
must be off before a restart can be attempted. This function is
useful in applications such as pump motor backspin protection
(where you need to prevent the pump motor from restarting if it
is spinning backwards), 2 speed operations where speed
changes require a minimum disconnect (spin-down timer), or
reversing applications to prevent plugging (anti-plugging timer).
F045 = Maximum Starts per Hour Lockout
Factory Setting = 0 (Disabled)
Range = 1 – 10 or 0 (Disabled)
F045=1 through 10, will count the number of start commands
within a 1 hour period. If the setting (maximum starts per hour)
is exceeded, starting is prohibited until sufficient time has
expired. This timer initiates upon the first start in an hour. It
resets after 1 hour from that start and waits until another
subsequent start to initiate again. (Often used in conjunction
with F046).
Note:
Consult the motor manufacturer for a “Starts-per-Hour” or
“Starting Duty Cycle” rating. Larger motors tend to have lower
starts-per-hour ratings.
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