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6 Setup and Operation
6.1 Setup Controls
Hazardous voltage.
Will cause death or serious injury.
To avoid electrical shock or burn, turn off
main and control voltages before per-
forming installation or maintenance.
The SIKOSTART 3RW35 has two separately adjustable ramps,
each having voltage and ramp settings. If the decel timer is set
to a value other than zero, the second ramp is changed to a
decel ramp, utilizing the soft stop capabilities of the SIKOSTART
3RW35.
The setup controls are at the right side of the controller and are
accessible without removing the cover. Figure 13 shows the
eight potentiometer controls. Values of the potentiometer set-
tings are listed in Table 4. Use a small screwdriver to change the
potentiometer setting, rotating clockwise to increase and coun-
terclockwise to decrease.
All potentiometers are 16 position digital devices.
Start Time 1 & 2 - set the start times (acceleration times) for
ramps 1 & 2 for normal dual ramp operation. If the Decel Timer
is set greater than zero, then ramp #2 is changed to a decel
ramp.
Initial Torque 1 & 2 - set the initial voltage at a percentage of
the line voltage: 30-80%. the initial setting should be the level
that causes the motor shaft to turn as soon as the Run signal is
given. Note, if the Decel Timer is set greater than 0, the #2
torque is changed to the decel torque at the end of the soft
stop.
Decel Timer - sets the length of time that the motor is ener-
gized during a pump/soft stop. Note, if the Decel Timer is set
greater than 0, the pump stop function is enabled and replaces
the normal dual ramp soft start function. Ramp #1 is the start
ramp and ramp #2 is the stop ramp in this case.
Max Voltage - sets the highest starting voltage during the start
ramp. This produces a limited current start.
PFC - sets the energy saving feature. On lightly loaded motors,
the motor voltage is reduced which saves energy. If the motor
load increases, the motor voltage is increased proportionately.
Note, setting PFC to F disables the function.
20
Table 4 Potentiometer Setting Values
Dial
Initial Voltage
Setting
(% Full Voltage)
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
6.2 LED Indicators
There are four LED indicators located below the potentiometers.
These LEDs indicate controller status and fault conditions as fol-
lows:
LED1 Control Power - indicates that control voltage is applied
and is above the minimum required for operation.
LED2 Running - indicates that the motor is running when it is
lit continuously. Flashing indicates that there is a voltage phase
loss at the incoming main power source.
LED 3 Up-to-voltage - indicates that the controller has finished
the starting ramp and the motor is running at full voltage.
LED 4 Shorted SCR - indicates that the controller senses a
shorted SCR and that service may be required.
See Section 9 for troubleshooting details.
6.3 Controller Setup
Before the initial startup, set the controls as follows.
1. Set Start Time T1 and T2. This setting is application depen-
dent, affected by load torque, motor voltage, and total iner-
tia. Rotate potentiometer to the mid position, 8, to obtain a
start time of 15 seconds.
2. Set Initial Voltage IT1 & IT2. Set potentiometer at the mid-
range position 8.
3. Set Stop Timer. The 0 setting allows the load to coast to
rest. If the soft stop feature is required for the application,
set to the 8 position.
Siemens Energy & Automation, Inc.
Start Time
(Seconds)
30
0.5
33
1.0
36
2.0
40
4.0
43
6.0
46
8.0
50
10
53
12
56
15
60
20
63
25
66
30
70
35
73
40
76
50
80
60
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