Chapter 3: Configuration and Parameters
Page 3–39Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
parameTer deTails – “advanCed” menu of parameTers (ConTinued)
P8.14 – Shut Down (1) * Hold. Reg. Type:
Description:
Read/Write
This features controls the soft stop to improve stability.
• Shut Down Trip 1 is an overlap trip. If firing patterns get overlapped at the beginning of stop
ramp this trip will occur.
Range: Modbus Decimal Value: Default (decimal):
• Off : The motor will stop in the set time.
• On : The stop time is truncated if the motor experiences severe
torque fluctuations during the soft stop.
• 0
• 1 • On (1)
Modbus Address: Modbus Format:
53769 ( D209 hex ) 16-bit unsigned
Touchscreen Menu Path:
Home → Advanced → Trip Settings → Shut Down (1)
P8.15 – Shut Down (2) * Hold. Reg. Type:
Description:
Read/Write
This features controls the soft stop to improve stability.
• Shut Down Trip 2 is an oscillation trip. If oscillations in the power factor are too great during a
soft stop, then this trip will occur.
Range: Modbus Decimal Value: Default (decimal):
• Off : The motor will stop in the set time.
• On : The stop time is truncated if the motor experiences severe
torque fluctuations during the soft stop.
• 0
• 1 • On (1)
Modbus Address: Modbus Format:
53770 ( D20A hex ) 16-bit unsigned
Touchscreen Menu Path:
Home → Advanced → Trip Settings → Shut Down (2)
* The Shut Down Trips are in operation during the soft stop ramp.
At the end of the soft stop ramp, occasionally the motor can become unstable due to torque fluctuations.
If the torque fluctuations get too bad then the SR55 may trip, this could cause issues with the restart. With Shut Down
Trips turned on, if the torque fluctuations are experienced the SR55 will automatically stop the soft stop ramp and let
the motor coast to a full stop. This stops the SR55 tripping and allows for a restart without resetting a trip. This is
normally only for a very small time due to torque fluctuations occurring at the end of a soft stop ramp. If a Shut Down
occurs, then it is logged in the log file but will not affect the operation of the SR55. Both shut down trips have to do
with rapid changes in power factor. Soft stop smoothing will keep shut down trips from happening.
P8.16 – Thyristor Firing Trip Hold. Reg. Type:
Description:
Read/Write
Detects if there is a fault with one or more of the internal thyristors or bypass relays.
Range: Modbus Decimal Value: Default (decimal):
• Off : The SR55 will attempt to start and run although the operation may be
erratic. Operating in this mode for prolonged periods may result in SCR
failure.
• On : Trips if one or more of the thyristors / bypass relays has failed short circuit
(typically 0.1Ω or less). Check by measuring the resistance between L1-
T1, L2-T2, L3-T3. Never check resistance when power is applied. Using a
multi-meter, measured resistance for a good thyristor may exceed 500kΩ.
A shorted thyristor will measure 0.1Ω or lower; with the measured value
being the resistance of the meter test leads.
• 0
• 1 • On (1)
Modbus Address: Modbus Format:
53774 ( D20E hex ) 16-bit unsigned
Touchscreen Menu Path:
Home → Advanced → Trip Settings → Thyristor Firing Trip
Warning: never check resisTance when power is applied.
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