Slip-Ring Motor - Emerson Digistart IS1x0043B series User Manual

Safety Rating Mechanical
Information Data Installation

10.8 Slip-ring motor

The Digistart IS can be used to control a slip-ring motor, using rotor resistance.
Figure 10-8 Slip-ring motor
1/L1
3/L2
8
5/L3
E
220-440 VAC +10%
-15%
110-210 VAC +10%
-15%
E
Parameter settings:

Pr 4D Relay B Action
 Select 'Changeover Contactor'
 Pr 4E Relay B On Delay
 Set this to the maximum time (5m:00s).
 Pr 13A Motor Data-1 Ramp
Select 'Dual Ramp' (for slip-ring induction motor control)

 Pr 13D Changeover Time
 Default setting is 150 milliseconds. Set this to a value just greater than the changeover contactor (KM1) pole closing
time.
 Pr 13C Slip Ring Retard
 Default setting is 50%. Set this parameter to a value which is high enough to cause the motor to instantly accelerate
once the rotor resistance (R1) has been bridged out and low enough to avoid a motor current pulse.
For this installation to function correctly, only use the primary motor settings. Only use the constant current start method
NOTE
(Pr 2A Start Mode).
Digistart IS User Guide
Issue: 4
Electrical Keypad Quick Start
Installation and Commissioning
Status
2/T1
4/T2
6/T3
5
1
2 6
3
4
7
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Operation Programming Diagnostics
9
Application Technical Maintenance Options
Examples Data
Control voltage
1
Remote control inputs
2
Motor thermistor input
3
RTD/PT100 input
4
24 Vdc output
5
Relay outputs
6
Analog output
7
Three-phase supply
8
Slip-ring induction motor
9
KM1 Changeover contactor
F1 Semiconductor fuses
(optional)
S1 Start/stop contact
S2 Reset contact
R1 Rotor resistance
(external)
81