Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 231)

Chapter 7
Programming Parameters
7-65
Parameter 730– Field Failure Delay [Fld Failure Dly]
Internal units : Seconds x 10
Programming Terminal units: Seconds
Minimum Value: 0.1
Maximum Value: 5.0
Default Value: 1.0
Description: This parameter indicates the length of time that the field
current feedback value can deviate by more than 50% of field current
reference before a field loss condition is indicated.
Parameter 731– Tach Loss CEMF [Tach Loss CEMF]
Internal Units: 4096 = 1000h = 100% of full CEMF
Programming Terminal Units: %
Minimum Value: 0 %
Maximum Value: 50%
Default Value: 10.01%
Description: To open window: increase P731 and decrease P732.
This parameter sets the CEMF level, above which a Tach (or encoder)
Loss Fault will occur. CEMF is obtained from the Armature Voltage
Feedback level, less the calculated IR drop. Units for this parameter
are in percent of full CEMF. The velocity feedback must also be less
than the level set by Parameter 732 for a Tach Loss fault to be
detected.
Parameter 732 – Tach Loss Velocity [Tach Loss Vel]
Internal Units: 4096 = 1000h = 100% base motor speed
Programming Terminal Units: %
Minimum Value: 0.244 %
Maximum Value: 50%
Default Value: 2.002%
Description: This parameter sets the velocity feedback level, below
which a Tach (or encoder) Loss Fault will occur. Units for this
parameter are in percent of base motor speed. The CEMF level must
also be greater than the level set by Parameter 731 for a Tach Loss
fault to be detected.
Parameter 733 – Armature Bridge Type [Arm Bridge Type]
Internal units : None
Programming Terminal units: None
Minimum Value: 0
Maximum Value: 1
Default Value: 1
Description: Selects the type of armature bridge (regenerative or
nonregenerative). The choices are:
0 = Nonregenerative Drive. The armature bridge has 6 SCRs.
1 = Regenerative Drive. The armature bridge consists of 12 SCRs.