Rockwell Automation 1336VT AC DRIVE 5-300AMP (2-160KW) PROGRAMMING MANUAL - Manual (Page 41)

Local and Serial Port Parameters
Firmware Version 1.01-3.01
Chapter 3
3-27
Parameter 38 Ċ Overload Current
Freq P R
P R Enter % of Rated Output Current
50
115
100
Read and Write
Units
Minimum Value
Maximum Value
Factory Setting
Important: MOPC Parameter 36 limits the drive output current
independent of the setting of Parameter 38. The overload range available
from the drive will be limited by the lower of the two settings. If the setting
of Parameter 36 is greater than the setting of Parameter 38, an overload
condition could occur before MOPC is activated.
When used with the branch circuit protection fuses recommended in the
1336VT User Manual, this parameter provides inverse timed overload
protection designed to meet NEC and UL equivalent requirements.
Parameter Settings for all ratings are listed in Chapter 6 — Overload
Current Settings.
To approximate the I 2 T motor thermal overload cutoff, timing starts when
the output current rises above this parameter setting. Output current is then
timed inversely proportional to the level of current above this setting.
When the timed trip level is reached, the drive will fault, display Fault
Code F07 and coast-to-stop.
Parameter 38 Selection
The value of Parameter 38 is selected from the charts in Chapter 6 based on
drive rating and approximate motor full load current rating. Enter the value
found in the column labeled % corresponding to the correct data.
Important: The overload current setting is intended for use with single
motor applications. When two or more motors are connected to the drive
output, individual motor thermal overloads are recommended and
Parameter 38 must be set to 100. The drive cannot detect or be
programmed to monitor individual motor currents.