Basler-electric DECS-400 User Manual Page 164
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152 9369700990 Rev R
DECS-400 Reboots Frequently
If a single input power source is used and the input power is less than the minimum as specified or
fluctuates below the minimum, the DECS-400 will reboot. Increase input power to meet or exceed the
specified requirements.
Backup Battery Replacement
An internal battery maintains real-time clock information when DECS-400 operating power is removed or
lost. The 3.6 volt, lithium, backup battery is secured in a holder located behind the front panel. The
backup battery should be replaced every five years by using the following procedure. In applications
where the battery is not desired, refer to the following instructions to remove the battery.
1. Obtain a replacement battery (Tadiran TL-2150/S, Basler Electric 37819, or equivalent).
2. Remove the DECS-400 from service by observing all applicable safety and shutdown procedures.
3. Loosen the captive Phillips screw in both latches, release each latch, and withdraw the draw-out
assembly from the case.
Caution
Observe all applicable electrostatic discharge (ESD) precautions when
handling the draw-out assembly.
4. Locate the battery holder and cover on the circuit board attached to the front panel. When facing the
back side of the front panel, the battery holder and cover are located near the upper, left-hand corner
of the circuit board.
5. Unclip and remove the cover from the battery holder.
6. Remove the battery from the battery holder. Note the orientation (polarity) of the battery. The new
battery must be installed with the same orientation.
Warning!
Do not short-circuit the battery, reverse the battery polarity, or attempt
to recharge the battery.
Note
The battery should be disposed of properly. Consult your local health,
solid waste disposal, or recycling agency for battery disposal
guidelines.
7. Install the new battery in the holder. Ensure that the polarity of the installed battery is correct (+ to +
and – to –).
8. Place the battery cover over the battery holder and snap it into place.
9. Insert the draw-out assembly into the case and secure it with the latches.
10. Place the DECS-400 back in service by observing all applicable safety and startup procedures.
Upgrading DECS-400 Firmware
Future enhancements to DECS-400 functionality may make a firmware upgrade desirable. Before
upgrading DECS-400 firmware, read the entire procedure and ensure that you have all files required to
Maintenance DECS-400
- INSTRUCTION MANUAL 1
- Preface 3
- 9369700990 Rev R iii 5
- DECS-400 Preface 5
- Contents 7
- General Information 13
- Generator Voltage Regulation 14
- Control Output 14
- Stability 14
- Overexcitation Limiters 16
- Minimum Excitation Limiter 16
- Stator Current Limiter 16
- Reactive Power Limiter 17
- Protective Functions 17
- Programmable Logic 17
- Model and Style Number 19
- Human-Machine Interface 21
- Menu System 22
- Editing Settings 32
- Password Protection 33
- Metering Screen 34
- Setpoint 35
- Percent of Range 35
- Alarms Message 36
- Operating Mode 37
- Functional Description 39
- Front Panel Keyboard 41
- Contact Input Circuits 41
- Digital Signal Processor 42
- Microprocessor 42
- IRIG Port 42
- Memory Circuits 43
- Digital to Analog Converter 43
- Control Output Circuits 43
- Meter Driver Circuits 43
- Relay Output Contacts 43
- Front Panel LEDs 44
- Front Panel LCD 44
- RS-232 Communication Port 44
- RS-485 Communication Ports 44
- Startup Functions 45
- Control Modes 46
- Field Overvoltage 50
- Generator Undervoltage 50
- Generator Overvoltage 50
- Loss of Sensing Voltage 50
- Power Supply Low 51
- Loss of Field (40Q) 51
- Field Overtemperature 52
- Volts per Hertz (24) 52
- MEASURED 53
- Exciter Diode Monitor (EDM) 54
- Limiter Functions 55
- Overexcitation Limiter 56
- TIME IN SECONDS 57
- Underexcitation Limiter 58
- (0.49 x kW 59
- 1.0) x kvar_level 59
- Underfrequency Limiter 59
- GENERATOR VOLTS 60
- Var Limiter 61
- Limiter Scaling 61
- Droop Compensation 61
- Reactive Differential 61
- Line Drop Compensation 61
- Autotracking 62
- Data Recording and Reporting 62
- Data Logging 63
- Power System Stabilizer 64
- PSS Theory of Operation 65
- Figure 19. Speed Signal 66
- Stabilizing 67
- Compensation 67
- SSW 5SSW 4 67
- P0026-21 68
- 12-09-04 68
- Figure 26. Output Stage 69
- BESTCOMS™ Software 71
- Communication 73
- Modem Communication 75
- System Configuration 75
- Settings 83
- Gain Settings 89
- Figure 44. PID Calculator 90
- Protection 100
- Metering 110
- Data Log 114
- 9.22936 ×= 121
- Analysis 123
- Caution 126
- 9369700990 Rev R 115 127
- DECS-400 BESTCOMS™ Software 127
- Installation 133
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- Installation DECS-400 134
- 9369700990 Rev R 123 135
- DECS-400 Installation 135
- Connections 137
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- Table 13. IRIG Terminals 141
- Cross-Current Compensation 144
- Typical Interconnections 145
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- 9369700990 Rev R 135 147
- Communication Connections 148
- P0026-01 149
- 10-01-04 149
- Commissioning 151
- Warning! 154
- Recommended PSS Testing 159
- Maintenance 161
- Backup Battery Replacement 164
- Upgrading DECS-400 Firmware 164
- Specifications 169
- Generator Current Sensing 170
- Field Voltage and Current 170
- Field Isolation Module 170
- Contact Inputs 170
- Control Outputs 171
- Metering Outputs 172
- Contact Outputs 172
- Communication Ports 172
- Regulation Accuracy 173
- Metering Accuracy 174
- Traverse Rates 174
- Setpoint Tracking 174
- Soft Start 175
- Sequence of Events Recording 175
- Data Logging (Oscillography) 175
- Trending 175
- Limiters 175
- Underexcitation 176
- Protection Functions 177
- Type Tests 178
- Agency Certifications 178
- Real-Time Clock Battery 178
- Environment 179
- Physical 179
- Logic Schemes 182
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- DECS-400 Programmable Logic 183
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- Programmable Logic DECS-400 184
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- 9369700990 Rev R 183 195
- Logic Scheme Modification 196
- Logic Definitions 207
- Outputs 210
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- Relay Output 1 through 6 214
- Modbus™ Communication 215
- Modbus Modes of Operation 216
- Serial Transmission Details 216
- Modbus™/TCP 218
- Preset Multiple Registers 219
- Response 220
- Data Formats 221
- Generic Types UI8 and I8 222
- Generic Types UI16 and I16 222
- Generic Types UI32 and I32 222
- CRC Error Check 223
- DECS-400 Register Tables 225
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- Revision History 243
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