Delta 28-299A Operations Instructions Page 66
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9 Troubleshooting
When a protection condition is detected, the MCD 500 will
write this to the event log and may also trip or issue a
warning. The soft starter's response to some protections may
depend on the Protection Action settings (parameter group
16).
If the MCD 500 trips you will need to reset the soft starter
before restarting. If the MCD 500 has issued a warning, the
soft starter will reset itself once the cause of the warning has
been resolved.
Some protections cause a fatal trip. This response is pre-
defined and cannot be overridden. These protection
mechanisms are designed to protect the soft starter, or can
be caused by a fault within the soft starter.
9.1 Trip Messages
This table lists soft starter's protection mechanisms and the
probable cause of the trip. Some of these can be adjusted
using parameter group 2 Protection and parameter group 16
Protection Action, other settings are built-in system
protections and cannot be set or adjusted.
D
Display Possible cause/Suggested solution
Battery/Clock A verification error has occurred on the real time clock, or the backup battery voltage is low. If the
battery is low and the power is off, date/time settings will be lost. Reprogram the date and time.
Related Pars.: 16-12
Current Imbalance
Current imbalance can be caused by problems with the motor, the environment or the installation,
such as:
-
An imbalance in the incoming mains voltage
-
A problem with the motor windings
-
A light load on the motor
Current imbalance can also be caused by incorrect cabling between the external bypass contactor
and the soft starter or an internal problem with the soft starter, particularly an SCR that has failed
open circuit. A failed SCR can only be definitely diagnosed by replacing the SCR and checking the
starter's performance.
Related Pars.: 2-2, 2-3, 16-2
Excess Start Time Excess start time trip can occur in the following conditions:
•
1-1 Motor Full Load Current is not appropriate for the motor
•
1-4 Current Limit
•
1-6 Start Ramp Time has been set greater than the setting for 1-9 Excess Start Time Setting
•
1-6 Start Ramp Time is set too short for a high inertia load when using Adaptive Acceleration
Control
Related Pars.: 1-1, 1-6, 1-4, 1-9, 7-9, 7-1, 7-6, 7-4, 16-7
FLC Too High The MCD 500 can support higher motor FLC values when connected to the motor using inside delta
configuration rather than in-line connection. If the soft starter is connected in-line but the
programmed setting for 1-1 Motor Full Load Current is above the in-line maximum, the soft starter will
trip at start.
Related Pars.: 1-1, 7-1
Frequency The mains frequency has gone beyond the specified range.
Check for other equipment in the area that could be affecting the mains supply (particularly variable
speed drives).
If the MCD 500 is connected to a generator set supply, the generator may be too small or could have
a speed regulation problem.
Related Pars.: 2-8, 2-9, 2-10, 16-5
Troubleshooting MCD 500 Operating Instruction
MG.17.K3.02 - VLT
®
is a registered Danfoss trademark 65
9 9
- Operating Instructions 1
- MG.17.K3.02 - VLT 2
- 5 Application Examples 3
- 6 Operation 3
- 7 Programming 4
- 9 Troubleshooting 5
- 10 Specifications 5
- 1 Safety 6
- 2 Introduction 7
- 177HA382.11 8
- 3 Installation 9
- 177HA514.10 10
- 4 Electrical Installation 11
- 4.1.3 Remote Inputs 12
- 4.1.4 Serial Communication 12
- 4.1.5 Earth Terminal 12
- 177HA542.11 13
- 4.1.7 Motor Connection 14
- 4.2 In-Line Installation 14
- 177 HA4 31.11 15
- 177HA500.11 16
- 4.4 Current Ratings 17
- Start Time (seconds) 19
- Starts Per Hour 19
- 4.6 Bypass Contactor 22
- 4.7 Main Contactor 22
- 4.8 Circuit Breaker 22
- 4.9 Power Factor Correction 22
- 4.10 Fuses 23
- 4.10.1 Power Supply Fuses 23
- 4.10.4 Ferraz Fuses - HSJ 25
- 4.11 Schematic Diagrams 28
- 177HA426.11 29
- 5.3 Starting Modes 31
- 5.3.1 Constant Current 31
- 5.3.2 Current Ramp 31
- Voltage (% full voltage) 32
- 177HA511.10 33
- 5.6 Inside Delta Operation 34
- 5.7 Typical Start Currents 34
- 177HA522.10 36
- 177HA523.10 37
- 5.10 Emergency Run Operation 38
- 5.11 Auxiliary Trip Circuit 39
- 5.12 Soft Braking 40
- 5.13 Two Speed Motor 41
- 6.2 Control Methods 44
- 6.3 Local Control Buttons 44
- 6.4.8 Date and Time (S8) 46
- 6.4.9 SCR Conduction Bargraph 46
- 6.4.10 Performance Graphs 46
- 7.2 Quick Menu 48
- 7.2.1 Quick Setup 48
- 7.2.2 Application Setups 49
- 7.2.3 Loggings 50
- 7.3 Main Menu 50
- 7.3.1 Parameters 50
- 7.3.2 Parameter Shortcut 50
- 7.3.3 Parameter List 51
- 7.4 Primary Motor Settings 52
- 7.4.1 Brake 53
- 7.5 Protection 53
- 7.5.1 Current Imbalance 53
- 7.5.2 Undercurrent 53
- 7.5.4 Frequency Trip 54
- 7.6 Inputs 54
- * [00:00 - 30:00 55
- 7.7 Outputs 56
- 7.7.1 Relay A Delays 56
- 7.7.2 Relays B and C 56
- 7.7.4 Motor Temperature Flag 57
- 7.7.5 Analog Output A 57
- 7.8 Start/Stop Timers 57
- 7.9 Auto-Reset 58
- 7.9.1 Auto-Reset Delay 58
- 7.10 Secondary Motor Set 58
- 7.11 Display 60
- 7.11.2 Performance Graphs 61
- 7.12 Restricted Parameters 61
- * [100 - 2000 62
- 8.1 Set Date and Time 63
- 8.2 Load/Save Settings 63
- 8.3 Reset Thermal Model 63
- 8.4 Protection Simulation 63
- 8.5 Output Signal Simulation 64
- 8.6 Digital I/O State 64
- 8.7 Temp Sensors State 64
- 8.8 Alarm Log 64
- 8.8.1 Trip Log 64
- 8.8.2 Event Log 65
- 8.8.3 Counters 65
- 9.2 General Faults 69
- Symptom Probable Cause 70
- 10.1 Accessories 72
- 10.1.1 Communication Modules 72
- 10.1.2 PC Software 73
- 10.1.3 Finger Guard Kit 73
- *MG17K302* 77
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