Parameter and variable descriptions 6-33 – Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE User Manual
Page 89
PARAMETER AND VARIABLE DESCRIPTIONS
6-33
1557-UM050F-EN-P – June 2013
Autotune Inertia [Autotune inertia]
Linear number:
144
Minimum value:
0.00 sec
Maximum value:
100.00 sec
Default value:
0.00 sec
This parameter specifies the value of total system inertia measured during autotuning. If the inertia measurement
is successful, then parameter "Total inertia" in "P Speed Control" is set equal to the value of this parameter. If the
inertia measurement fails, then parameter "Total inertia" is not changed.
16 Option Parameters
Synchronizing Regulator Gain [Sync reg gain]
Linear number:
225
Minimum value:
0.0
Maximum value:
7.9
Default value:
1.0
This parameter specifies the gain of the synchronizing regulator.
Synchronous Transfer Lead Angle [Sync lead angle]
Linear number:
226
Minimum value:
-90 degrees
Maximum value:
90 degrees
Default value:
0 degrees
This parameter specifies the angle by which the motor voltage leads the drive input voltage when the motor is
assumed to be synchronized. The purpose of this parameter is to compensate for any phase difference
between the drive input voltage and the bypass contactor supply voltage.
Synchronous Transfer Off Delay [Sync off delay]
Linear number:
227
Minimum value:
0.000 seconds
Maximum value:
0.500 seconds
Default value:
0.100 seconds
This parameter specifies the time delay between the bypass contactor being requested to close and the drive
shutting off. It is normally set to slightly less than the contactor closing time.
Synchronizing Error Maximum [Sync error max]
Linear number:
228
Minimum value:
0 degrees
Maximum value:
30 degrees
Default value:
0 degrees
This parameter specifies the maximum allowable synchronizing phase error. The bypass contactor will be
requested to close when the synchronizing phase error has remained below this maximum value for the time
specified by the Synchronizing Time parameter.
Synchronizing Time [Sync time]
Linear number:
229
Minimum value:
0.1 seconds
Maximum value:
10.0 seconds
Default value:
1.0 seconds
This parameter specifies the time that the synchronizing phase error must be less than Synchronizing Error
Maximum before the bypass contactor is requested to close.