Rockwell-automation 1391ES AC Servo Controller User Manual download pdf (Page 59)

Transformers and Shunt Regulators

Chapter 9

9-57

Shunt Regulator Operation Refer to Chapter 4 for an explanation of the shunt regulator circuitry. The

nominal data for the shunt regulator is as follows:.

Overvoltage Trip Point = 405V DC±2.5%

DC Bus Shunt “ON” Point = 386.4V DC

DC Bus Shunt “OFF” Point = 366.9V DC

Nominal DC Bus Voltage = 300V DC

DC Bus Undervoltage Detect = 145V DC±20%

The shunt regulator behavior is modified by an adjustable duty cycle timer.

The timer is used to model the shunt resistor temperature. A selector switch

(SW1) determines the temperature level and therefore the average power

level at which the controller will fault. When this level is reached, the

controller will be forced to fault on an overvoltage. This action would be

equivalent to turning the shunt regulator off.

The Duty Cycle Selector Switch is located on top of the controller near

terminal Block, TB5 (see Figure 1.1). The switch has 16 positions

designated “0 to F,” with “0” being the lowest value and “F” the highest.

The higher the setting, the higher the average power seen by the shunt

resistor. The Duty Cycle Selector Switch settings for various

controller/shunt combinations are shown in Tables 9.A and B.

Important: Accurate operation of the Duty Cycle Timer is dependent on

the shunt resistor value. Do Not substitute alternate values.

Table 9.A provides the required Duty Cycle Selector Switch settings and

resistor power trip points for factory supplied configurations. An optional

external resistor assembly (catalog number 1391-MOD-SR22A) is

available for the 22.5A 1391B-ES.

Table 9.A

Maximum Switch Settings and Trip Points for Factory Supplied Configurations

* Denotes SW1 setting at time of shipment. User must reconfigure controller when using optional

1391-MOD-SR22A.

Configuration

1391B-ESAA15 w/ standard 16 ohm internal resistor

1391B-ESAA22 w/ standard 12 ohm internal resistor

1391B-ESAA22 w/ 9 ohm external resistor

(1391-MOD-SR22A)

1391B-ESAA45 w/ standard 5 ohm external resistor

SW1

Switch

Setting

Nominal

Trip Point

164w, ±10%

162w, ±10%

386w, ±10%

715w, ±10%

ATTENTION: The designated settings for the factory supplied

configurations must be used or damage to the controller may

result.

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Rockwell-automation 1391ES AC Servo Controller User Manual Page 59

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