Brand: Basler Electric

Basler Electric DECS-250 Digital Excitation Control System

Name: Basler Electric DECS-250 Excitation Control | Seven Star LLC
Brand: Basler Electric
SKU: DECS-250

Description

A 15-amp digital excitation controller for generators and synchronous motors

The Basler Electric DECS-250 is a complete digital excitation control system. It regulates voltage, var and power factor on a synchronous generator, adds generator protection in the same unit, and can drive a synchronous motor when set to motor mode. A 15-amp pulse-width-modulated (PWM) power stage gives a high initial response to load transients and suits shunt, auxiliary winding, permanent magnet or DC-fed excitation.

It is the controller to specify when an analogue AVR is not enough: paralleled gensets sharing reactive load over Ethernet, cogeneration sets with grid-code settings, or large motors needing power factor control. An optional power system stabilizer (PSS) covers stringent grid-code requirements.

What the DECS-250 controls and protects

Modes: AVR, field current (FCR), field voltage (FVR), power factor and var regulation
True RMS single-phase or three-phase sensing with full generator metering
Auto-tuning with two PID stability groups
Protection: 27/59, 81O/U, 32R, 40Q, exciter diode monitor, 59F, 51F, loss of PMG, field short circuit, 25 sync check
Limiters: overexcitation and stator current (temperature compensated), underexcitation, var, underfrequency or V/Hz
Load sharing over Ethernet; optional PSS to IEEE Std. 421.5 type PSS2A/2B/2C
Event recording, oscillography and trending; 16 contact inputs and 12 contact outputs, conformal coating on certain circuits

DECS-250 technical specifications

Power and output stage

Parameter	Specification
Control power, style LXXXXXX	16 to 60 Vdc nominal
Control power, style CXXXXXX	90 to 150 Vdc or 82 to 132 Vac
Control power burden	50 VA or 30 W
Operating power input	1-phase or 3-phase, 50 to 500 Hz; burden below 1 VA per phase
Continuous field current	20 Adc up to 55 C (131 F); 15 Adc up to 70 C (158 F)
10-second forcing	30 Adc
32 Vdc output	60 Vac nominal input; minimum field resistance 2.13 ohm
63 Vdc output	120 Vac nominal input; minimum field resistance 4.2 ohm
125 Vdc output	240 Vac nominal input; minimum field resistance 8.33 ohm

Sensing, inputs and outputs

Parameter	Specification
Voltage sensing (generator and bus)	1-phase or 3-phase; 100/120, 200/240, 400/480 or 600 Vac, +/-10 percent; 50/60 Hz
Current sensing	1-phase or 3-phase with separate cross-current input; 1 Aac or 5 Aac; burden below 1 VA
Contact inputs	16 programmable, dry contact
Auxiliary input	1; 4 to 20 mAdc or -10 to +10 Vdc
Output contacts	11 programmable form A and 1 watchdog form C; make, break and carry 7 A resistive at 24/48/125 Vdc (120/240 Vac)
Expansion modules	AEM-2020 analog and CEM-2020 contact expansion modules

Communication, environment and mechanical

Parameter	Specification
Communication	USB type B; RS-232 (9-pin) for optional external autotracking; RS-485 Modbus RTU; CAN bus (ECU port and expansion port); Ethernet 100baseT, 100baseFX optional, Modbus TCP for unit-to-unit communication; optional Profibus
Operating temperature	-40 C to 55 C at 20 Adc; -40 C to 70 C at 15 Adc
Storage temperature	-40 C to 85 C
Salt fog	Per MIL-STD 810E method 509.3
Shock / vibration	15 G in three perpendicular planes / 5 G from 18 to 2,000 Hz
Weight	6.62 kg (14.6 lb)
Dimensions (W x H x D)	159.0 x 304.8 x 219.0 mm (6.26 x 12.00 x 8.62 in)
Agency and certification	CSA certified, UL 6200:2019 recognized, CE, UKCA, EMC and LVD compliant, China RoHS compliant; recognized by Bureau Veritas, DNV and ABS

Choosing the right DECS-250 style

First fix the control power style: LXXXXXX takes 16 to 60 Vdc (24 V or 48 V battery systems) and CXXXXXX takes 90 to 150 Vdc or 82 to 132 Vac. Then match the field: the 32, 63 and 125 Vdc output levels follow the operating power input (60, 120 or 240 Vac nominal) and each has a minimum field resistance. The PSS, fibre Ethernet and Profibus are style options; the full style chart is in the datasheet, so send the style number of the existing unit or the generator nameplate data and we will confirm the match.

Installation and commissioning notes

Setup is done from a PC with BESTCOMSPlus software, using drag-and-drop BESTlogicPlus programmable logic, a real-time strip chart and the auto-tuning function. Paralleled units must share the Ethernet network for load sharing, and a separate cross-current CT input is provided for droop-type paralleling. It is panel electronics: mount it in a suitable enclosure and follow the instruction manual for wiring, field flashing and the PMG or shunt power connection.

Where the DECS-250 is used

Typical homes are large standby and prime-power gensets in oil and gas, petrochemical and utility power stations, and synchronous motors on compressors or pumps using the var and power factor modes. The datasheet range of -40 C to 70 C is useful in hot enclosures, but note the derating: 20 Adc continuous only up to 55 C.

Related Basler Electric items

The datasheet lists the DGC-2020 genset controller, BE1-FLEX protection, ES Series relays, MVC manual voltage controllers as backup excitation, the IDP-801 7.5 inch display panel, and CEM-2020 and AEM-2020 expansion modules.

Frequently asked questions

What output current can the DECS-250 supply?

20 Adc continuous up to 55 C, 15 Adc up to 70 C, and 30 Adc for 10 seconds of forcing.

Can it control a synchronous motor?

Yes. The datasheet describes excitation control for synchronous generator or synchronous motor applications.

Does it include generator protection?

Yes: 27/59, 81O/U, 32R, 40Q, EDM, 59F, 51F, loss of PMG, field short circuit and 25 sync check.

Which communication ports are fitted?

USB, RS-232, RS-485 Modbus RTU, CAN bus and Ethernet with Modbus TCP; Profibus and fibre Ethernet are optional.

Is Seven Star LLC a Basler Electric distributor?

No. We are an independent supplier based in Muscat, and we source genuine Basler Electric products for customers in Oman and the GCC when requested.

Documents and quotation

This listing carries the DECS-250 product bulletin (SZP-26, 11-24) for reference. Use it with the manual to confirm the correct order code, then send the code, options and quantity via the quote form. Seven Star LLC works from Muscat as an independent supplier for GCC customers, and prices are provided on request only. Always confirm ratings, options and approvals against the latest manufacturer documents. See Diesel Generator Spare Parts and the Basler Electric brand page for related items.

Datasheets & Documents

Datasheet Basler Electric DECS-250 product bulletin (SZP-26, 11-24) Download

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About brand

Basler Electric, founded in 1942 and based in Highland, Illinois, builds controls that sit on generators and synchronous machines: excitation systems, voltage regulators, genset controllers and protection relays.

Seven Star LLC is an independent supplier serving Oman and the GCC. Our Basler Electric listing covers the DECS-150, DECS-250, DECS-250E and DECS-450 digital excitation control systems, the AVC63-12 and AVC63-4A analog voltage regulators, the BE2000E digital voltage regulator, the DGC-2020 and DGC-2020HD genset controllers and the BE1-11g generator protection system.

Where Basler Electric controls are used

These products belong on standby and prime-power gensets and on larger synchronous machines in oil and gas, petrochemical, power, water and construction projects across the Gulf. Excitation controllers regulate generator voltage and reactive power, genset controllers handle start, metering and protection, and the BE1-11g protects the generator itself.

Ordering Basler Electric parts: what we need

Send the full model and style code from the nameplate, the generator rating and excitation type, the control power supply, and the existing regulator or controller being replaced. We match each request to the manufacturer bulletin before quoting.