EL5072 - Diagnostics
The integrated excitation source provides a wide range with different adjustable excitation frequencies and voltages. The following diagnostic options for the excitation source are available:
- Missing supply voltage of the excitation source
- Excitation source not activated
- Short circuit or overload of the excitation source
The remeasured input signal is checked for:
Furthermore, an increased temperature in the terminal can lead to shutdown. The temperature overshoot can be caused by:
- Exceeding of the total excitation current
- Insufficient ventilation of the terminal (see chapter Installation positions)
Missing supply voltage of the excitation source
The excitation voltage is generated from the 24 VDC supply of the power contacts. If the supply to the power contacts Up is missing or too low, no voltage can be provided. This is indicated by the following messages.
Error diagnosis | Display | Description |
|---|---|---|
Up LED | Off | Supply voltage Up missing or too low of the power contacts |
DiagMessage, | 0x810B | Supply voltage Up too low or missing |
Excitation source not activated
The excitation source is switched off in the delivery state and must be switched on by setting index 0x800:08 "Enable excitation" to TRUE.
If there is a short circuit or an overload, the excitation source is also switched off until the cause has been eliminated.
A disabled excitation source is indicated by:
Error diagnosis | Display | Description |
|---|---|---|
Up LED | Flashing green | Supply voltage Up of the power contacts is present but excitation voltage Uexc has been disabled |
Short circuit or overload of the excitation source
A short circuit or an overload of the excitation source is indicated by:
Error diagnosis | Display | Description |
|---|---|---|
LED | Red | There is a short circuit on the primary side on channel n, or an overload of the excitation source has been detected. |
0x60n0:03 | TRUE | There is a short circuit on the primary side on channel n, or an overload of the excitation source has been detected. |
DiagMessage, | 0x8624 | Overcurrent detected Ch 1 + Ch 2, excitation voltage switched off |
If a short circuit or an overload is detected, the excitation source is switched off to prevent a malfunction of the terminal. Checks are carried out at regular intervals to ascertain whether the short circuit or overload is still present. If this is no longer the case, the excitation source is switched on again.
The currently measured currents can be read out from the terminal. If the excitation source is switched off, only a leakage current flows.
Index | Name | Meaning |
|---|---|---|
0x9000:19 | Excitation current | Current measured on channel 1 |
0x9010:19 | Excitation current | Current measured on channel 2 |
0xF900:19 | Excitation current (sum) | Currently measured sum current on channel 1 + channel 2 |
Amplitude error of the measuring signal
In order to optimally resolve the input measuring signal, the internal gain factors are determined using the following parameters, among others:
- 0x80n1:15 "Excitation voltage"
- 0x80n1:16 "Sensitivity"
- 0x80n1:18 "Overall sensor range"
If these specifications are not selected correctly, it can lead to an input measuring signal that is too high (amplitude error). This is indicated by:
Error diagnosis | Display | Description |
|---|---|---|
LED | Red | There is an amplitude error of the measuring signal on channel n |
0x60n0:04 | TRUE | There is an amplitude error of the measuring signal on channel n |
DiagMessage, | 0x8706 | Channel n in saturation |
Exceeding of the total excitation current
The maximum sum current of the excitation source is 50 mArms (140 mApp). If the excitation source is permanently subjected to this or higher loads, this can lead to an increased temperature inside the terminal. In order to avoid a malfunction of the terminal, a warning is issued first and, if the temperature continues to be exceeded, an error is issued which leads to the excitation source being switched off.
Error diagnosis | Display | Description |
|---|---|---|
DiagMessage, | 0x470e | Warning: Temperature has exceeded the limit |
DiagMessage, | 0x8104 | Error: Permissible temperature exceeded |
The currently measured currents can be read out from the terminal. If the excitation source is switched off, only a leakage current flows.
Index | Name | Meaning |
|---|---|---|
0x9000:19 | Excitation current | Current measured on channel 1 |
0x9010:19 | Excitation current | Current measured on channel 2 |
0xF900:19 | Excitation current (sum) | Currently measured sum current on channel 1 + channel 2 |
Insufficient ventilation of the terminal
A high ambient temperature or insufficient air circulation inside the terminal housing, e.g. due to the installation position, can lead to excess temperature inside the terminal. In order to avoid a malfunction of the terminal, a warning is issued first and, if the temperature continues to be exceeded, an error is issued which leads to the excitation source being switched off.
Error diagnosis | Display | Description |
|---|---|---|
DiagMessage, type "Warning", text ID | 0x470e | Warning: Temperature has exceeded the limit |
DiagMessage, type "Error", text ID | 0x8104 | Error: Permissible temperature exceeded |
Note | |
Using the fan cartridge ZB8610 For demanding applications with high power requirements or high ambient temperatures, the use of the ZB8610 fan cartridge can be helpful. This enforces air circulation within the terminal housing and ensures better heat dissipation from the housing. |