DESCRIPTION

The SSR voltage regulator is completely solid state and uses

state-of-the-art circuitry to provide high performance with a wide

range of standard features. Voltage is internally or remotely

adjustable, with single- or three-phase customer selectable

sensing over a wide range. The SSR has a variable frequency

compensated operating characteristic (See Figures 1 and 2).

During start-up, the solid state voltage build-up circuit oper

ates from generator output residual voltages as low as 5%

of nominal. The built-in over-excitation limiting removes the

output power if the exciter field voltage exceeds a predeter

mined level. After removing field power, the regulator main

tains its shutdown state until the generator has decreased

below 5% of nominal.

The SSR may also be used with generator equipped with

single-phase permanent magnet generators (PMG) for ex

citation power. With this application or applications where a

power isolation transformer is incorporated, use suppression

chassis P/N 9261500100 or P/N 9261500101. supplied with

each regulator.

Maintenance of the SSR voltage regulator is simplified by the

use of replaceable modules. Sensitive electronic equipment

is protected from the effects of moisture, contaminants,

vibration, and shock, by encapsulation.

The SSR Series Voltage Regulators provide reliable, high performance voltage regu

lation for 50/60 and 400 Hz brushless generators requiring 12A of excitation at either

32. 63 or 125 Vdc. The SSR Voltage Regulator receives its power for precise voltage

regulation from a PMG (Permanent Magnet Generator), self excitation from the gen

erator line, or other AC sources. Supplied with each regulator is a spike suppression

chassis for PMG and power isolation transformer applications.

FEATURES

• Regulation accuracy better than ±0.25%

• Adjustable frequency compensation

• Selectable single or three-phase sensing

• Built-in parallel droop or cross current compensation

• Overexcitation shutdown

• Solid state voltage buildup

• EMI suppression built-in

• Modular replaceable parts for ease of service

• Applicable for 50. 60 or 400 Hz systems

• Compatible with single phase PMG generator

(50 to 240 Hz power input range)

• Spike suppression chassis

• Compatible with a wide range of accessory control and

protective devices

• CSA certified, CSA File Number LR 23131

Voltage Regulator Mounting

The Voltage Regulator will operate when mounted in any position, however, it should be vertically

mounted to obtain optimum cooling. The Regulator can be mounted in any location where the ambient

temperature does not exceed the operational limits. Due to its rugged construction, the Regulator can be

mounted directly on the generator. Mounting hardware should be selected based upon the vibration and

shock expected to be encountered during shipping/transport and normal operation. Refer to Figure 2-1

for the outline drawing of the unit which provides overall and mounting dimensions.

Spike Suppression Module Mounting

The Spike Suppression Module will operate when mounted in any position. The Spike Suppression

Module can be mounted in any location where the ambient temperature does not exceed the operational

limits. Due to its rugged construction, the Spike Suppression Module can be mounted directly on the

generator. Mounting hardware should be selected based upon the vibration and shock expected to be

encountered during shipping/transport and normal operation. Refer to Figure 2-2 for the outline drawing

of the unit which provides overall and mounting dimensions.

DESCRIPTION

The Basler SSR Series Voltage Regulators precisely controls the output voltage of an ac electric

generating system by controlling the amount of current supplied to the exciter (or generator) field. The

SSR Series Voltage Regulators are for use on brushless generators that require a high performance

regulator and use a wide range of accessory devices.

Both the SSR 63-12NF and SSR 125-12NF have full-wave outputs, while the SSR 32-12NF is of the half

wave output type.

ACCESSORIES

The SSR Series Voltage Regulators are designed to be compatible with any of the Basler accessories

and equipment listed below:

a. Remote mounted Overexcitation Circuit Breaker (P/N 9 1859 00 014). Refer to Section 2 for more

information.

b. VAR/Power Factor Controller (SCP 250)

c. Series Boost Option (SBO 160)

d. Current Transformers (CT2 through CT50)

e. Exciter Diode Monitor (EDM 200)

f. Minimum/Maximum Excitation Limiter (EL 200)

g. Auto-Synchronizer (BE3-25A)

h. Auto-Synchronizer (BE1-25A)

i. Line Drop Compensator (LDC 300)

j. Low and Medium Power Isolation Transformers.

RA-70M Theory of Operation

The RA-70M operates in a similar manner to the RA-70A and RA-70P. The basic differences are that the

RA-70M is designed to provide a three-wire potentiometer compatible output and is used in conjunction

with the Basler Manual Voltage Controls to provide an autotracking capability for “bumpless” transfer

between the Auto and Manual operating modes of many exciter systems. A diagram showing the RA-70M

function blocks is shown in Figure 5.

Nulling/Autotracking Input Circuits

This sensing circuit connects to the F+ and F− outputs of the AVR and to the F+ and F− outputs of the

MVC. Both inputs are compared and the difference is sent to the microprocessor for processing and

output as the nulling signal. If Autotracking is enabled, the null output will read zero as long as tracking is

maintained. The field voltage range (32 Vdc, 63 Vdc, or 125 Vdc) is automatically selected. A front panel

LED lights whenever the AVR and MVC are nulled.

Pushbutton/Contact Inputs Circuit

The pushbuttons (front panel switches) provide for front panel control over the Raise, Lower, Pre-position

1. Pre-position 2. Mode Select, and Programming functions. External dry contacts provide the same

functions as the first four pushbuttons on the front panel except for the Programming function, which is

available only by the use of the front panel pushbuttons. The contact inputs allow remote control of the

reference adjuster.