FSequence IPM Owners Guide.book Page 31 Thursday, October 6, 2011 3:33 PM
| Circuit Level Advanced Settings |
Priority | toggled and the power manager starts to reconnect the AC relays that have |
| been set to Enabled. Freedom Sequence will sequentially start to reconnect |
The Priority setting here is the same as the priority setting discussed in | all the load circuits in the priority order defined for AC relays. |
“Circuit Priority” on page 17. The only difference here is that the change in |
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priority setting happens from the | EXCEPTION: If an AC load Circuit3 is set to a lower priority than an AC |
Settings instead of from the Config screen. | load Circuit2 with a Generator Soft Start setting of Enabled, |
| Circuit3 will get disconnected to avoid a priority inversion1. |
Generator Soft Start
The purpose of having a generator soft start (GEN Soft Start) feature is to allow generators to be loaded gradually after the transfer switch flips from shore power to generator or when the generator is started. Without engaging the GEN Soft Start feature, all the load circuits controlled by Freedom Sequence will abruptly get connected to generator power. This may cause the generator to experience a step load which may cause its voltage/ frequency to dip and in turn cause nuisance tripping of sensitive loads.
Each relay of Freedom Sequence that is associated to Line1 or Line2 can be
individually configured to two GEN Soft Start settings: Enabled or Disabled.
By default, all relays associated to Line1 or Line2 are set to Disabled.
When Freedom Sequence receives the Generator Run (B+) signal high, it will trigger the AC relays to disconnect load circuits that have GEN Soft Start configured to Enabled. For AC relays configured to Disabled, those AC relays will remain connected during the GEN Soft Start process. After the Generator Run (B+) signal goes high, Freedom Sequence will apply the Gen Warmup Delay. At the end of this Gen Warmup Delay,
GENERATOR IS OFF
| E | GE | AC LOAD | PRIORITY GEN SOFT START | STATUS | |
| R | N | Circuit1 | [1] | Disabled | ON |
H | O |
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| Circuit2 | [2] | Enabled | ON |
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| Circuit3 | [3] | Disabled | ON |
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DURING GEN WARM UP DELAY
| E | GE | AC LOAD | PRIORITY | GEN SOFT START | STATUS |
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| R | N |
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H | O |
| Circuit1 | [1] | Disabled | ON |
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S |
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| Circuit2 | [2] | Enabled | OFF |
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| Circuit3 | [3] | Disabled | OFF |
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GENERATOR IS ON
| E | GE | AC LOAD | PRIORITY GEN SOFT START | STATUS |
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| R | N |
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H | O |
| Circuit1 | [1] | Disabled | ON |
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| Circuit2 | [2] | Enabled | ON |
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| Circuit3 | [3] | Disabled | ON |
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Circuit3 will get disconnected to avoid tripping due to priority inversion.
Circuit2 will get reconnected first then Circuit3 follows, once the generator power has been fully ramped up and stabilized.
the Freedom Sequence power manager assumes the transfer switch has
1.A priority inversion occurs when an AC load that has a higher circuit priority gets disconnected first before another AC load that has a lower circuit priority.
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