Rockwell Automation FlexPak 3000 Power Module Version 4.2 - Manual (Page 154)

APPENDIX B
FlexPak 3000 49’1340 e B-50
TACH LEAD FLT THRESH (P.227)
The Threshold after which a REVERSED TACH LEADS fault (F00014) is generated.
A REVERSED TACH LEADS fault is generated if the difference between the speed reference
and speed feedback is greater than this value for at least the amount of time set by
TACH LEAD FLT DELAY.
Parameter Range: 0.0 to 250 (% of TOP SPEED)
Default Setting: 200.0
Parameter Type: Tuneable
OIM Menu Path(s): Additional Parameters
Refer also to Parameters: TACH LEAD FLT DELAY (P.228)
TACH LOSS SCR ANGLE (P.608)
The SCR firing angle in degrees at which tach loss is determined when current is present and motor
speed is less than 5% of TOP SPEED.
Parameter Range: 0 to 127 (degrees)
Default Setting: 109
Parameter Type: Tuneable
OIM Menu Path(s): Additional Parameters
The open armature detection algorithm also uses this parameter. An open armature is detected when
the armature current is zero, motor speed feedback is <5% of TOP SPEED, and the SCR firing angle is
equal to TACH LOSS SCR ANGLE.
Use the following steps to adjust this parameter if a tach loss occurs.
Step 1. Check tach lead connections and polarity,
Step 2. Increment TACH LOSS SCR ANGLE by 1.
Step 3. Restart the drive.
Step 4. If tach loss occurs and the angle is less than 127
° , return to step 2.
WARNING
The incorrect setting of this parameter can cause an overspeed condition.
Set the value of this parameter only as high as necessary to stop incorrect tach loss faults.
Failure to observe this precaution could result in bodily injury.
TOP SPEED (P.011)
TOP SPEED is the highest normal running speed of the motor. This parameter scales the feedback
device. TOP SPEED depends on several factors:
Parameter Range: 5 to 5000 RPM
Default Setting: 500 RPM
Parameter Type: Configurable
OIM Menu Path(s): Drive Reference - Drive Reference Limits Quick Start
• If there is no field weakening, the top speed is typically the same as the
nameplate base speed.
• If there is field weakening, the top speed is the same as the field weakened
speed. Top speed is typically more than the base speed when field weakening is
applied.
Warning
The incorrect setting of this parameter can cause an overspeed condition. This parameter must be set
by a qualified person who understands the significance of setting it. Set the value of this parameter
accurately per your application requirements. Failure to observe this precaution could result in bodily
injury.