CERUS CI-007-P2, Installation, Programming Operation, & Maintenance Manual

Page: 83 / 137

Chapter 6 - Parameter Description
6-16
FG1 Stall Mode
70 Yes
FG1 Stall Level
71 110 %
)0.+ " 1 !- !
This parameter has two motor cooling type
selections: Self Cooled and Forced Cooled.
The self-cooled motors have a fan attached to the
motor shaft providing cooling airflow when motor
runs. Because of their design, these motors always
need to run above 20Hz to provide enough cooling
otherwise VFD should be de-rated.
The forced-cooled motors have an electrical air
blower providing cooling airflow continuously.
These motors can run at low frequency
continuously without overheating.
)0/6 07+ & " "! !- & !
If the motor current exceeds a VFD amperage
rating above the FG1-64 level for FG1-65 time, the
VFD will activate a selected in I/O-76~79 AUX
relay and show Overload warning message on the
display.
)006 036 04+ & " " 6 & !
If FG1-66 is set to Yes and the motor current
exceeds a VFD current rating above the FG1-67
level for FG1-68 time, the VFD will trip on
Overload fault.
)05+ $! ' ' ' , " !
FG1-69 has a 3-bit
selection system
starting from the right to the left to enable bit #1
Output Phase Loss, Bit #2 Input Phase Loss, Bit #3
Direct Input Operation.
This function is used to Trip VFD on Input or
output phase loss.
1
ST
bit [00x]: Output phase loss protection
0: Output phase loss protection is disabled.
1: Output phase loss protection is enabled. The
VFD will trip if output current sensors do not read
current in one of the output phases.
2
ND
bit [0x0]: Input phase loss protection
0: Input phase loss protection is disabled.
1: Input phase loss protection is enabled.
The VFD monitors the pattern of DC bus ripples
and trips if it detects a single-phase ripple pattern.
3
RD
bit [x00]: Direct input operation protection
selection.
0: Direct input operation protection is disabled.
1: Direct input operation protection is enabled.
The VFD will trip when direct input magnetic
contactor is turned On and Off during direct input
operation.
)3*6 3 + " & ! ! ! &
FG1-70 enables parameter FG1-71 and Stall
Prevention Mode. FG1-71 is set as a percentage of
the motor FLA. This mode works as a current
limiting function protecting motor from excessive
current above FG1-71 setting by decreasing the
motor speed. If VFD cannot accelerate over
0.5~3.5Hz and trips on ETH fault, the FG1-71 stall
level is most likely set too low for the current
application and VFD keeps very low speed trying to
decrease motor current. Stall level will be
automatically reduced if inverter operates at a
frequency higher than the base frequency.
If stall prevention level is set above 120% of VFD
current rating, the level will be limited at 120% of
VFD current rating.
Note: Acceleration or Deceleration time may get
longer due to stall prevention function operation. If
stall prevention level setting is close to the actual
FG1 Motor Type
63 Self-cool
FG1 OL Level
64 105% FG1 OL Time
65 10.0sec
100%
95%
65%
Output Current
20Hz 60Hz
Self-Cool
Forced-Cool
FG1 OLT Time
68 30.0 sec
FG1 OLT Level
67 110% FG1 OLT Select
66 Yes
Motor
Current %
Trip Time
ETH 1 min
1 minute
ETH cont
FG1 Trip Select
69 111