SAF OPAL LT - Manual (Page 7)

Starter Settings
6
Front Panel Layout
10% 50%
Initial Voltage
100% 400%
Current Limit
2 30 Sec.
Ramp-Up
0.2 30 Sec.
Ramp-Down
FLC %
50% 100%
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FLC - Full Load Current (Motor FLC)
The adjustment allows easy setting of the RVS-AX
current level, automatically adjusting current based
functions (Overload, Current Limit, etc).
Set FLC potentiometer according to the following
equation:
100
FLC
FLA Motor
FLC
× =
Where:
Motor FLA is the motor's Full Load Current rating as
shown on its nameplate.
FLC is the starter Full Load Current as shown on its
label.
Example:
When starting a 27A motor using RVS-AX 31:
87% 100
31
27
FLC%
= × =
Therefore set the FLC% to a
reading of 87% (see Ex.)
Initial Voltage
Determines the initial voltage
to the motor (torque is directly
proportional to the square of
the voltage).
Range: 10-50% of nominal
voltage.
This adjustment also
determines the inrush current
and mechanical shock.
Too high of a setting may cause high initial mechanical
shock and high inrush current (even if Current Limit is
set low, as the Initial Voltage setting over-rides the
Current Limit setting).
Too low of a setting may result in prolonged time until
motor starts revolving. The motor should start
revolving immediately after Start signal.
Current Limit
Determines motor's highest
current during starting.
Range is 100-400% of FLC (as
set on starter's FLC adjustment).
Too high of a setting will allow
higher currents to be drawn from
Mains, resulting in faster
acceleration.
I%
600%
100%
400%
Too low of a setting may prevent the motor from
completing the acceleration process and reaching full
speed.
Generally, this setting should be set to the highest
acceptable value in order to prevent stalling.
Caution
Starting Current should not exceed the allowable
conditions as shown in page 3.
Ramp-up Time
Determines motor's voltage ramp-
up time from initial to full
voltage.
Range: 2-30 sec.
It is recommended to set Ramp-
Up Time to the minimum
acceptable value (approx. 5 Sec).
U%
100%
2 30 Sec.
Notes:
1. Setting Current Limit low will extend Ramp-Up
Time.
2. When motor reaches full speed before voltage
reaches nominal, Ramp-Up Time adjustment
is overridden, causing voltage to quickly ramp
up to nominal.
FLC %
50% 100%
° °
° °
° 87 %
Ramp-Down time (Soft-stop)
U%
10%
50%
100%
2 30 Sec.
Used to control deceleration of
high friction loads. When Ramp-
Down potentiometer is set, upon
stop signal the starter output
voltage is gradually ramped
down.
Range: 0.2-30 sec. When "Ramp-
down Time" is set to minimum, the motor will stop
immediately.
U%
0.2
100%
30 sec