Adjustment Procedure; Planning The Installation - RS Pro 209-6356 Hoja De Instrucciones

V8509
Size 0.25 - 2.2 kW
Size 1.1 - 5.5 kW
General
The problems associated with starting shock of DOL started induction
motors can be cured with the help of RS Snatch-Free Soft-Start
Module. Two module sizes are available for use with three-phase
induction motors up to 5.5 kW. The compact size and easy connection
of these modules makes retrofitting simple. The adjustments of switch-
on torque and run-up ramp time enable easy adjustment for a particular
application.
This gives the user the benefits of:
●
Mechanical Reduced cost of transmission components
●
Low adjustable starting torque
●
Conveyer belts Falling over, banging or slipping of
products eliminated
●
Electrical Reduced starting current

Adjustment procedure

1. Set potentiometer M (starting torque) and potentiometer H (run-up
ramp), both fully counter clockwise.
2. Increase potentiometer M in a clockwise direction until the switch-on
torque is enough to start the drive immediately on connection of the
power.
3. Increase potentiometer H in a clockwise direction until the drives
ramps up smoothly. Turn as far clockwise as possible whilst retaining
a smooth soft-start characteristic. The module is correctly adjusted if
the internal bridging relay is heard to close as soon as the drive has
ramped up.
Adjustment ranges
Designation, Meaning
M - Switch-on torque
0%
100%
H - Run-up ramp
15s
H
1,5s
Note
a. RS Snatch-Free Soft-Start Modules are specifically designed for use
with three-phase induction motors.
b. RS Snatch-Free Soft-Start Modules should not be used in
conjunction with capacitive loads as damage to the power
semiconductors can occur. However power factor connection at the
module input is allowed.
c. The use of measuring equipment with a high voltage for example, a
megger, can result in damage to the RS Snatch-Free Soft-Start
Modules
■ - Suggestion for initial setting (initial factory setting)
The above values are approximate values only

Planning the installation

Intended use:
RS Snatch-Free Soft-Start Modules are equipment to be mounted in a
suitable enclosure (e.g. equipment cabinet) as part of a machine or
electrical system.
The technical data as well as information concerning the supply
conditions are to be taken from rating plate and from this data sheet
and must be strictly observed.
2
RS Stock No.
Scaling Explanation
17%
33%
Rated torque
50%
M
66%
83%
6s
Time until
3,6s
bridging relay
2,6s
closes
2,1s
1,7s
Starting performance:
RS Snatch-Free Soft-Start Modules have a starting performance with a
useful reduction of switch-on torque.
209-6356
The starting current is not reduced. Application with a high starting
209-6362
frequency can lead to problems with the phase sensitivity of the
overload of some motor starters.
Compatible Soft-Start Modules RS stock nos 212-8683 and 212-8699
should be used when a good soft-start performance with reduced
starting torque and starting current is required.
The achievable soft-start characteristic is influenced by the inertia and
friction of the load. Run-up times of a few seconds are only possible if
the load has significant inertia.
Voltage supply system:
To meet the requirements of the LOW-VOLTAGE DIRECTIVE these RS
Snatch-Free Soft-Start Modules may only be used with earthed neutral
TT/TN supply systems.
Short-circuit protection of controller:
Fast semiconductor fuses are required for protection of the RS Snatch-
Free Soft-Start Module against short circuits on the output terminals of
the controller (see Technical Data).
Wiring protection:
Short-circuit and overload protection of the wiring corresponding to the
size of cable used (e.g. as in EN 60439-1, EN 60204-1 for machines)
must be provided for. A circuit breaker, motor starter, or additional fuses
are required.
Thermal considerations:
RS Snatch-Free Soft-Start Modules are designed for continuous
operation with motors up to the indicated power. Overload protection of
the controller and the motor must be provided for. Suitable protection
can be provided by a thermal overload relay, a motor starter or
thermistor protection of the motor. Thermistor motor protection is
recommended for motors with frequent starting.
Values of starting duty as in the Technical Data should not be exceeded
(check spacing).
EN 60947-4-2:
RS Snatch-Free Soft-Start Modules meet with the requirements of
standard EN60947-4-2:. Information on the following data must be
provided:
- Utilization category: 12 A: AC-53b: 4-15: 170;
with 12 A:
AC-53b: Soft start with bypass during running
4-15:
170:
- Form designation: 2 i.e. Soft start
Pole-change motors:
Reset times of 0.25 s must be allowed for.
The following alternatives can be used for fast changing between
speeds:
● Allow for reset time as above
● Provide a soft starter for each winding
Combination with electronic injection brakes:
All RS Snatch-Free Soft-Start Modules can be combined with RS
Injection-Brake Modules (RS Stock number 209-6384 and 209-6407).
Interference suppression:
When opening contactor or relay coils, or electric brakes, high energy
R.F. interference can occur. In extreme conditions this can result in a
malfunction of the RS Snatch-Free Soft-Start Module. For this reason
the coils should be fitted with suitable interference suppressors:
- DC coils:
- AC coils:
Obtaining maximum immunity:
Control inputs and outputs should be wired as short as possible and
away from supply, motor or control cables which could carry significant
interference. A direct connection to equipment external to the metal
enclosure should not be made.
Rated current I
N
Max. starting current is 4 I for 15 s
N
Minimum time [s] between a completed
and a new soft-start at maximum starting
current and time
Suppressor diodes
RC-suppressors