IMO Precision Controls Jaguar VXS, User Manual

Page: 32 / 67

For Motor 1 only. Refer also to Function 67.
Factory-set default level is at 105% of the cur-
rent rating of a standard 4-pole induction motor
appropriate to the capacity of the inverter. If it
is intended to use the inverter to drive a motor
of a different frame size, refer to Function 70.
Example 1: For a VXS400-3 4kW inverter
driving a 4-pole 2.2kW motor at 415V:
Inverter FLC = 9A
Typical 2.2kW motor FLC = 4.8A
Setting for Function 16 = 4.8
Check:
Motor FLC
=
4.8
= 0.533 or 53.3%
Inverter FLC 9.0
which is within the range of 20-105% of
inverter FLC and the motor is protected.
Example 2: For a VXS400-3 4kW inverter
driving a 4-pole 0.37kW motor at 415V:
Inverter FLC = 9A
Typical 0.37kW motor FLC = 1.08A
Setting for Function 16 = 1.08
Check:
Motor FLC
=
1.08
= 0.12 or 12%
Inverter FLC 9.0
This is outside the 20-105% range and the
motor is not protected by the inverter. A
stand-alone thermal protection relay should be
wired to the motor thermistor. Then set
Function 15 = 0 to disable Function 16.
Makes DC injection braking active or inactive.
0 = Braking inactive (factory-set default). This
setting may be required for regenerative
braking with an external braking resistor.
1 = DC braking active in accordance with the
settings of Functions 18, 19 and 20.
Sets the frequency, in terms of inverter output
frequency, at which DC injection braking will
be applied. Function 18 = 0 starts braking at
0.2Hz (default). Function 18 = 60 = 60Hz.
Sets the braking level at a selected percentage of
motor rated current in relation to the calculated
current in the DC bus. The braking torque will
be dependent on the motor characteristics.
0 = No braking current applied
…increasing in steps of 1% to…
100 = 100% of motor equivalent rated current.
The factory-set default value is 50%.
Sets the time (max. 30s) during which braking
will be applied to bring the motor to rest. Note
that if the load inertia is high, it is possible that
the inverter cannot absorb the rate of energy dis-
sipation if a low time value is set. In such a
case, the driven machine may continue to rotate
after the braking cycle is complete.
The factory-set default value is 0.5s.
18 Injection braking — start freq.
19 Injection braking — level
20 Injection braking — time
Hz
O/P
t
Function 19
A (DC)
O/P
t
Function 20
Speed
n
t
Decel
DC
brake
Function 18
17 Injection braking — mode
16 Thermal overload 1 — level
30
WARNING Inverter braking functions are
not a substitute for mechanical braking
devices designed to ensure safety.
WARNING Inverter braking functions are
not a substitute for mechanical braking
devices designed to ensure safety.