Basler Electric DECS-200 Digital Excitation Control System

be put into service without warning.

Internal Tracking Between DECS-200 Operating Modes

In applications using a single DECS-200. the DECS-200 can be programmed so that the inactive

operating modes track the active operating mode. Operating modes include AVR, FCR, PF, and var. If

the excitation system is normally operating on-line in Internal mode and a loss of sensing occurs, the

DECS-200 could be transferred to manual (FCR) mode where the loss of sensing has no impact on the

exciter's ability to maintain proper excitation levels. While performing routine testing of the DECS-200 in

backup mode, the internal tracking feature allows a transfer to an inactive mode that will result in no

disturbance to the system.

Communication With a PC

Communication between the DECS-200 (front panel RS-232 port) and a PC is possible through

BESTCOMS software. BESTCOMS enables fast and easy programming of setpoints and ranges and

allows for step changes to facilitate proper stability settings. BESTCOMS also provides easy start and

stop control and operator adjustment of the excitation system with real-time metering. The software

catalog number is BESTCOMS-DECS200. BESTCOMS is provided with the DECS-200 as part of the

software/manual package.

Sample Style Number

The style number identification chart (Figure 1-2) defines the electrical characteristics and operational

features included in the DECS-200. For example, if the style number were DECS-200-1L, the device

would have the following characteristics and features.

DECS-200  -- Digital Excitation Control System

1 --- Internal autotracking/transfer

L --- 24/48 Vdc control power supply

SPECIFICATIONS

DECS-200 electrical and physical characteristics are listed in the following paragraphs.

Control Power

Input Voltage

DC Input: 16 to 60 Vdc (style XL) or 90 to 150 Vdc (style XC)

AC Input: 85 to 132 Vac, 50/60 Hz (style XC only)

Note: Isolation transformer for ac input is required when dual control

power sources are used.

Burden

DC Input: 30 W

AC Input: 50 VA

Terminals

DC Input: B7 (+), B8 (–)

AC Input: B9 (L), B10 (N) (style XC only)

Operating Power

To achieve the proper DECS-200 output voltage, the appropriate operating power input voltage must be

provided.

32 Vdc PWM Output

Nominal: 60 Vac

Operating Range: 56 to 70 Vac, ±10%

Frequency Range: 50 to 500 Hz

Configuration: 1-phase or 3-phase

Burden: 780 VA

63 Vdc PWM Output

Nominal: 120 Vac

Operating Range: 100 to 139 Vac, ±10%

Frequency Range: 50 to 500 Hz

Configuration: 1-phase or 3-phase

Burden: 1.570 VA

125 Vdc PWM Output

Nominal: 240 Vac

Operating Range: 190 to 277 Vac, ±10%

Frequency Range: 50 to 500 Hz

Configuration: 1-phase or 3-phase

Burden: 3.070 VA

Voltage Buildup

From a minimum of 3 Vac

Terminals

C2 (A-phase), C3 (B-phase), C4 (C-phase)

Sample Style Number

The style number identification chart (Figure 1-2) defines the electrical characteristics and operational

features included in the DECS-200. For example, if the style number were DECS-200-1L, the device

would have the following characteristics and features.

DECS-200  -- Digital Excitation Control System

1 --- Internal autotracking/transfer

L --- 24/48 Vdc control power supply

SPECIFICATIONS

DECS-200 electrical and physical characteristics are listed in the following paragraphs.

Control Power

Input Voltage

DC Input: 16 to 60 Vdc (style XL) or 90 to 150 Vdc (style XC)

AC Input: 85 to 132 Vac, 50/60 Hz (style XC only)

Note: Isolation transformer for ac input is required when dual control

power sources are used.

Burden

DC Input: 30 W

AC Input: 50 VA

Terminals

DC Input: B7 (+), B8 (–)

AC Input: B9 (L), B10 (N) (style XC only)

Operating Power

To achieve the proper DECS-200 output voltage, the appropriate operating power input voltage must be

provided.

32 Vdc PWM Output

Nominal: 60 Vac

Operating Range: 56 to 70 Vac, ±10%

Frequency Range: 50 to 500 Hz

Configuration: 1-phase or 3-phase

Burden: 780 VA

63 Vdc PWM Output

Nominal: 120 Vac

Operating Range: 100 to 139 Vac, ±10%

Frequency Range: 50 to 500 Hz

Configuration: 1-phase or 3-phase

Burden: 1.570 VA

125 Vdc PWM Output

Nominal: 240 Vac

Operating Range: 190 to 277 Vac, ±10%

Frequency Range: 50 to 500 Hz

Configuration: 1-phase or 3-phase

Burden: 3.070 VA

Voltage Buildup

From a minimum of 3 Vac

Terminals

C2 (A-phase), C3 (B-phase), C4 (C-phase)

Burden: <1 VA per phase

Terminals: A1. A2. A3

50 Hertz Sensing

Range 1: 100 Vac (85 to 127 Vac)

Range 2: 200 Vac (170 to 254 Vac)

Range 3: 400 Vac (340 to 508 Vac)

Range 4: 500 Vac (425 to 625 Vac)

60 Hertz Sensing

Range 1: 120 Vac (94 to 153 Vac)

Range 2: 240 Vac (187 to 305 Vac)

Range 3: 400 Vac (374 to 600 Vac)

Range 4: 600 Vac (510 to 660 Vac)

Generator Current Sensing

Type: Two ranges, two channels

Frequency: 50/60 Hz

Ranges: 1 A or 5 A nominal, continuous

Burden: <1 VA per phase

Terminals

1 A Sensing: B1. B3 (phase B, metering, var/PF, UEL)

B4. B6 (phase B, crosscurrent compensation)

5 A Sensing: B2. B3 (phase B, metering, var/PF, UEL)

B5. B6 (phase B, crosscurrent compensation)

Bus Voltage Sensing

Type: 1-phase, 4 ranges,

Burden: <1 VA

Sensing Ranges: Identical to generator voltage sensing

Terminals: A4. A5

Accessory Inputs

Current Input

Range: 4 to 20 mAdc

Terminals: A6 (+), A7 (–)

Voltage Input

Range: –10 to +10 Vdc