Section 1
General Information
Programming & Operation 4-19MN715
Table 4-2 Parameter Block Definitions Level 2 Continued
Block Title Parameter Description
PROTECTION External Trip OFF - External Trip is Disabled. (Ignores J4-16 switched input).
ON - External Trip is enabled. If a normally closed contact at J4-16 (to J4-17) is
opened, an External Trip fault will occur and cause the drive to shut down.
Local Enable INP OFF - Local Enable input is Disabled. (Ignores J4-8 switched input).
ON - A normally closed contact at J4-8 (to J4-17) is required to ENABLE the control
when operating in the Keypad mode.
I2T Response Fault– The drive has the normal one minute and three second overload faults.
Current Limit then Hold– Once triggered, frequency is ramped up or down until 103%
current, minimum or maximum frequency is attained. 103% has the effect of keeping
the I2T timer from integrating back up to 100%. If a frequency limit is reached before
the current limit, the drive will fault with a three second or one–minute overload fault.
If 103% current is attained, it is sustained until the overload condition is removed or a
new speed command is requested. The overload timer will then increment back up to
100% at which point the drive attempts to acquire reference speed. This prevents the
drive from limit cycling between 103% load and peak load.
Current Limit then Retry– Once triggered, frequency is ramped up or down until 80%
current, minimum or maximum frequency is attained. If a frequency limit is reached
before current limit, the drive will fault with an overload fault. If 80% current is
attained, it is sustained until the overload timer reaches 100% at which point the drive
attempts to acquire reference speed. This allows the drive to limit cycle between 80%
load and peak load.
I2T Trigger Sets the trigger level for I2T current limiting. If I2T Response is set to FAULT, I2T Trigger
is ignored. I2T overload faults will occur normally as needed. If I2T Response is set to
CURRENT LIMIT AND HOLD or CURRENT LIMIT AND RETRY, it sets the trigger
level for current limiting to 100% or 80% of full load respectively. The load timeout
indicator is monitored and when percent time remaining equals the percentage set in
this parameter, current limiting begins.
Peak CUR Limit Sets the peak current time limit. Peak current operation is allowed from start–up until the
timer expires. After timing out, full load current is imposed until the drive is stopped.
Timer reset occurs when the drive is disabled, faulted or stopped and the output
frequency is zero.
Foldback Gain Frequency Fold Back Gain – The maximum rate of change in frequency during current
limit. This is useful for applications that have 4:1 or more load to motor inertia ratio or
that have dramatic load vs. speed relationships such as: Load (f) = K* freq2
MISCELLANEOUS Restart Auto/Man Manual
Power Up Start – If set to MAN and a run command (enable line & FWD or REV
command) is present at power up, the motor will not run. The run command must be
removed then reapplied to start operation. The run command refers to the enable
plus direction (FWD or REV) lines.
Restart after Fault – If a fault occurs during operation, the control must be reset and
the run command must be removed then reapplied to start operation.
Note: If Restart Fault/Hr. is zero, the control must be manually reset. If
Restart Fault/Hr. is non–zero, the control will automatically attempt to reset
the fault but will not restart until the run command is removed then
reapplied to start operation.
Automatic
Power Up Start – If set to AUTO and a run command (enable line & FWD or REV
command) is present at power up, the control will automatically start.
Restart after Fault – If a fault occurs during operation, the control will automatically
reset (after the restart delay time) to resume operation if the Fault/Hr is set to a non
zero value.
3 Wire modes, AUTO start after a fault or loss of power will not occur because the
momentary contacts are open and the run command must again be applied. The run
command refers to the enable plus direction (FWD or REV) lines.
Restart Fault/Hr The maximum number of automatic restart attempts before requiring a manual restart.
After one hour without reaching the maximum number of faults or if power is turned
off and on again, the fault count is rest to zero.
Restart Delay The amount of time allowed after a fault condition for an automatic restart to occur.
Useful to allow sufficient time to clear a fault condition before restart is attempted.
Language Select Selects English or other language characters for keypad display.