Menu 7 − Analog I/O

Mode: RFC‑S

The diagram below shows the parameter structure for each I/O. See Internal I/O Identifier (11.068) for details of which I/O is present for different I/O options. 

Analog Outputs
The update rate for analog outputs is 250μs; although the output will only change at the update rate defined by the source parameter for the output. The following exceptions apply:

1. Speed Feedback (03.002) has an update rate of 4ms and includes a 16ms window filter. If this parameter is selected as a source for output 2 the update rate of the source changes to 250us and the only filter applied is the window filter associated with the position feedback interface (i.e. P1 Feedback Filter (03.042) for the P1 interface). It should be noted that this feature is only provided when the position feedback is from a drive interface and not from an option module.
2. If either analogue output is set up for current mode then the update rate for both analogue outputs is 4ms.

Analog Inputs
The normal sample rate for the analog inputs is 4ms, however this is increased to 250us for analogue inputs 1 and 2 under the following conditions:

1. The maximum and the minimum for the input are at their default values of 100.00% and -100.00% respectively.
2. The input is set to voltage mode.
3. One of the destinations given in the table below must be selected.
4. If the destination is Hand Mode Analog Reference (01.036) or Analog Reference 2 (01.037) the reference system must not be in uinpolar mode, i.e. Bipolar Reference Enable (01.010) must be one.

Note that Analog Input 1 Fast Update Active (07.026) and Analog Input 2 Fast Update Active (07.027) indicate if fast updating is active for each input.

Each analogue input has a resolution of 11 bits plus sign. The inputs can operate in different modes (defined by Analog Input 1 Mode (07.007) for analogue input 1). These modes include voltage, current and thermistor modes. The available modes depend on the hardware configuration and are given in the table below. 

The "Input Level" is defined for the different modes in the table below.

Analog Input 1 (07.001) is derived as follows:

Limits
A₁ is the value after the minimum and maximum limits are applied.

If Analog Input 1 Minimum (07.040) ≥ Analog Input 1 Maximum (07.043) then:
A₁ = 0.00% whatever the input level.

If Analog Input 1 Minimum (07.040) < 0.00% and Analog Input 1 Maximum (07.043) > 0.00% then:
A₁ = Input Level x (100.00% / Analog Input 1 Maximum (07.043))
A₁ is then limited between -100% and +100%.

Otherwise:
Input Level is limited between Analog Input 1 Minimum (07.040) and Analog Input 1 Maximum (07.043)
A₁ = [Input Level - Analog Input 1 Minimum (07.040)] x 100.00% / (Analog Input 1 Maximum (07.043) - Analog Input 1 Minimum (07.040))

For thermistor modes it should be noted that Analog Input 1 Minimum (07.040) and Analog Input 2 Minimum (07.041) have no effect and that the input resistance is limited between 0 and 5kΩ.

Analog Input 2 (07.002) shows the level of analogue input 2. See Analog Input 1 (07.001) for more information.

Thermal monitoring is provided within the drive to protect the power stage and the control system from over temperature.

Monitored Temperature 1 (07.004), Monitored Temperature 2 (07.005) and Monitored Temperature 3 (07.006) give an indication of the temperature of three selected monitoring points within the drive power system or control system. The required monitoring points can be selected using the monitor select parameters Temperature Monitor Select 1 (07.038), Temperature Monitor Select 2 (07.039) and Temperature Monitor Select 3 (07.052) respectively. The default values give two monitoring points in the power system in Monitored Temperature 1 (07.004) = 01001 and Monitored Temperature 2 (07.005) = 01002, and control board temperature 1 in Monitored Temperature 3 (07.006) = 00001.

The following table shows the value to be entered into the monitor select parameters to select the required monitoring point. If the monitoring point selected does not exist then the monitored temperature is always zero.

For a multi-module power system the power system measurement that can be selected is shown in the table below. It should be noted that the specific power module cannot be selected and that the highest temperature from each of the power modules is given.

See Monitored Temperature 1 (07.004) for details.

See Monitored Temperature 1 (07.004) for details.

By default, analog input 1 T5 is routed to the Pump and Fan software analog feedback input parameter PID Feedback Percent (29.034).

This parameter defines the possible input modes for analog input 1. By default it is set up in 4-20mA for connection to suitable feedback device to the main process PID1 when used in a Pump or Fan system.

By default, analog input 1 T5 is routed to the Pump and Fan software analog feedback input parameter PID Feedback Percent (29.034).

Analog Input 1 (07.001) is modified by Analog Input 1 Scaling (07.008), Analog Input 1 Offset (07.030) and Analog Input 1 Invert (07.009) before it is routed to its destination as follows:

A_1O = Analog Input 1 (07.001) + Analog Input 1 Offset (07.030)

A_1O is the value after the offset has been applied and is limited between -100.00% and 100.00%

A_1S = A_1O x Analog Input 1 Scaling (07.008)

A_1S is the value after the scaling and the offset have been applied and is limited between -100.00% and 100.00%

If Analog Input 1 Invert (07.009) = 0 then A_1I = A_1S otherwise A_1I = -A_1S

A_1I is the value after the invert, scaling and offset have been applied and is the final value that is routed to the destination defined by Analog Input 1 Destination (07.010).

By default, analog input 1 T5 is routed to the Pump and Fan software analog feedback input parameter PID Feedback Percent (29.034).

See Analog Input 1 Scaling (07.008).

By default, analog input 1 T5 is routed to the Pump and Fan software analog feedback input parameter PID Feedback Percent (29.034).

See Analog Input 1 Scaling (07.008).

By default, analog input 2 T6 is routed to the Pump and Fan software to provide an analog Hand mode reference via Hand Mode Analog Reference (01.036).

This parameter defines the possible input modes for analog input 2.

By default, analog input 2 T6 is routed to the Pump and Fan software to provide an analog Hand mode reference via Hand Mode Analog Reference (01.036).

The scaling, offset and invert functions for analog input 2 are defined in the same way as for analog input 1. See Analog Input 1 Scaling (07.008).

By default, analog input 2 T6 is routed to the Pump and Fan software to provide an analog Hand mode reference via Hand Mode Analog Reference (01.036).

The scaling, offset and invert functions for analog input 2 are defined in the same way as for analog input 1. See Analog Input 1 Scaling (07.008).

By default, analog input 2 T6 is routed to the Pump and Fan software to provide an analog Hand mode reference via Hand Mode Analog Reference (01.036).

The scaling, offset and invert functions for analog input 2 are defined in the same way as for analog input 1. See Analog Input 1 Scaling (07.008).

Analog Output 1 Source (07.019) defines the source parameter for analog output 1. The value of the source parameter is scaled with Analog Output 1 Scaling (07.020) and if the scaling is greater than 1.000 the value is clamped between -100% and +100% or between 0% and 100% depending on whether the output is bipolar or unipolar. The resulting value is then used to control the output. It should be noted that the normal rules for parameter routing do not apply, but the scaling always makes -100% to +100% correspond to the range from minus source parameter maximum to plus source parameter maximum, and 0% corresponds to the source parameter value of zero. This means for example that a parameter with a minimum of 1 and a maximum of 10 will produce an output that changes from 10% to 100% as the parameter is change from minimum to maximum.

The outputs provided with different hardware are given in the table below.

Unless the resolution of the output is limited by the source parameter, the resolution of the analogue outputs is 10 bit plus sign.

See Analog Output 1 Source (07.019).

Analog Output 1 Mode (07.021) defines the output mode for analogue output 1

Analog Output 2 Source (07.022) defines the source parameter for analog output 2. The value of the source parameter is scaled with Analog Output 2 Scaling (07.023) and if the scaling is greater than 1.000 the value is clamped between -100% and +100% or between 0% and 100% depending on whether the output is bipolar or unipolar. The resulting value is then used to control the output. It should be noted that the normal rules for parameter routing do not apply, but the scaling always makes -100% to +100% correspond to the range from minus source parameter maximum to plus source parameter maximum, and 0% corresponds to the source parameter value of zero. This means for example that a parameter with a minimum of 1 and a maximum of 10 will produce an output that changes from 10% to 100% as the parameter is change from minimum to maximum.

The outputs provided with different hardware are given in the table below.

See Analog Output 2 Source (07.022).

Analog Output 2 Source (07.022) defines the output mode for analogue output 2

By default, analog input 1 T5 is routed to the Pump and Fan software analog feedback input parameter PID Feedback Percent (29.034).

For analog input 1, and in voltage mode only, the full scale value used to determine the input level can be changed from 10V by calibrating the input. The calibration process is triggered by setting Calibrate Analog Input 1 Full Scale (07.025) to one. Calibrate Analog Input 1 Full Scale (07.025) is cleared automatically when the calibration process is complete. After calibration the actions are as follows:

It should be noted that Analog Input 1 Full Scale (07.051) is a power-down save parameter, and so the result is automatically retained after power-down.

By default, analog input 1 T5 is routed to the Pump and Fan software analog feedback input parameter PID Feedback Percent (29.034).

Analog Input 1 Fast Update Active (07.026) is one if the destination for analogue input 1 is being updated at the fast rate of 250us.

Analog Input 2 Fast Update Active (07.027) is one if the destination for analogue input 2 is being updated at the fast rate of 250us.

By default, analog input 1 T5 is routed to the Pump software analog feedback input parameter PID Feedback Percent (29.034). This parameter provides feedback to the Pump and Fan software on the integrity of the main process PID feedback device current loop. 

If Analog Input 1 Mode (07.007) is set to any of the 4-20mA or 20-4mA modes and the current falls below 3mA then Analog Input 1 Current Loop Loss (07.028) is set to one. If the current is more than 3mA or any other mode is selected then Analog Input 1 Current Loop Loss (07.028) is set to zero.

See Analog Input 1 Current Loop Loss (07.028).

By default, analog input 1 T5 is routed to the Pump software analog feedback input parameter PID Feedback Percent (29.034).

See Analog Input 1 Scaling (07.008).

The scaling, offset and invert functions for analog input 2 are defined in the same way as for analog input 1. See Analog Input 1 Scaling (07.008).

This is an instantaneous power output with fast update rate that is primarily intended to be used as a power feed-forward for applications with a Regen system front end. The full scale (100.0%) value is equal to a power of 3 x (VM_DC_VOLTAGE[MAX] / 2√2) x Full Scale Current Kc (11.061). This is compatible with the power output provided in Unidrive SP and is directly compatible with Regen Power Input on a regen capable Unidrive M (and the other power feed-forward parameters) in Regen mode. The scaling is intended to cover the maximum range of likely power in the drive. For example with a 400V 7.5kW drive the full scale d.c. link voltage is 831V and Kc=38.222A, and so the full scale value of this parameter is 3 x (831 / 2√2) x 38.222 = 33.689kW. For Open-loop, RFC-A and RFC-S modes a positive value of power indicates power flowing from the drive to motor. For Regen mode a positive value of power indicates power flowing from the supply to the regen drive.

Inverter Temperature (07.034) shows the estimated junction temperature of the hottest power device within the drive inverter. If this temperature exceeds the switch down threshold defined for the power stage the switching frequency is reduced provided this feature has not been disabled (see Auto-switching Frequency Change (05.035)).

Percentage Of d.c. Link Thermal Trip Level (07.035) gives the percentage of the maximum allowed temperature as estimated by the thermal model of the d.c. link components. If the drive has multiple parallel power modules, the model for the d.c. link components is provided in each power module, and so this parameter will remain at zero.

Percentage Of Drive Thermal Trip Level (07.036) gives the percentage of the thermal trip level of the temperature monitoring point or thermal model in the drive that is highest. This includes all thermal monitoring points (not just those selected by Monitored Temperature 1 (07.004), Monitored Temperature 2 (07.005) and Monitored Temperature 3 (07.006)), Inverter Temperature (07.034) and Percentage Of d.c. Link Thermal Trip Level (07.035).

Percentage Of d.c. Link Thermal Trip Level (07.035) is used directly to give Percentage Of Drive Thermal Trip Level (07.036), but for all other monitored values which are temperatures this is given by Percentage of thermal trip level = (Temperature - 40^oC) / (Trip temperature - 40^oC) x 100%

The location of the measurement or the thermal model that is related to this temperature is given in Temperature Nearest To Trip Level (07.037). If Percentage Of Drive Thermal Trip Level (07.036) exceeds 90% Drive Over-temperature Alarm (10.018) is set to one. If Percentage Of Drive Thermal Trip Level (07.036) reaches 100% one of the trips given in the table below is initiated. The trip can be reset when the percentage of thermal trip level fall below 95%.

Temperature Nearest To Trip Level (07.037) shows the thermistor location or the model that corresponds to the value shown in Percentage Of Drive Thermal Trip Level (07.036) in the form xxyzz as shown in the table below.

Temperature Monitor Select 1 (07.038) selects the temperature to be monitored in Monitored Temperature 1 (07.004). See Monitored Temperature 1 (07.004) for details.  

Temperature Monitor Select 2 (07.039) selects the temperature to be monitored in Monitored Temperature 2 (07.005). See Monitored Temperature 1 (07.004) for details. 

See Analog Input 1 (07.001).

See Analog Input 1 (07.001).

See Analog Input 1 (07.001).

See Analog Input 1 (07.001).

See Calibrate Analog Input 1 Full Scale (07.025).

Temperature Monitor Select 3 (07.052) selects the temperature to be monitored in Monitored Temperature 3 (07.006). See Monitored Temperature 1 (07.004) for details. 

Analog Input 1 Thermistor Type (07.053) selects the type of temperature feedback device used with Analogue Input 1 when Analog Input 1 Mode (07.007) is set up for temperature feedback mode. When a temperature feedback mode is selected 5V is applied to the output via a 3.3kΩ resistor to supply current through the temperature measurement device.

Analog Input 1 Thermistor Feedback (07.054) shows the measured resistance.

Over-temperature detection becomes active for input 1 if Analog Input 1 Thermistor Feedback (07.054) > Analog Input 1 Thermistor Trip Threshold (07.055). Over-temperature becomes inactive for input 1 if Analog Input 1 Thermistor Feedback (07.054) < Analog Input 1 Thermistor Reset Threshold (07.056). If Analog Input 1 Mode (07.007) is 7 or 8 (i.e. tripping is enabled) an Thermistor.001 trip is initiated.

See  Analog Input 1 Thermistor Trip Threshold (07.055).

If Analog Input 1 Mode (07.007) is set up to select temperature measurement then Analog Input 1 Thermistor Temperature (07.057) shows the temperature of the device, otherwise Analog Input 1 Thermistor Temperature (07.057) = 0.

Analog Input 2 Thermistor Type (07.058) selects the type of temperature feedback device used with Analogue Input 2 when Analog Input 2 Mode (07.011) is set up for temperature feedback mode. When a temperature feedback mode is selected 5V is applied to the output via a 3.3kΩ resistor to supply current through the temperature measurement device.

Analog Input 2 Thermistor Feedback (07.059) shows the measured resistance.

Over-temperature detection becomes active for input 2 if  Analog Input 2 Thermistor Feedback (07.059) > Analog Input 2 Thermistor Trip Threshold (07.060). Over-temperature becomes inactive for input 2 if  Analog Input 2 Thermistor Feedback (07.059) <  Analog Input 2 Thermistor Reset Threshold (07.061). If Analog Input 2 Mode (07.011) is 7 or 8 (i.e. tripping is enabled) an Thermistor.002 trip is initiated.

See  Analog Input 2 Thermistor Trip Threshold (07.060).

If Analog Input 2 Mode (07.011) is set up to select temperature measurement then Analog Input 2 Thermistor Temperature (07.062) shows the temperature of the device, otherwise Analog Input 2 Thermistor Temperature (07.062) = 0.

Unless the analogue input is set up in thermistor mode the update rate is 250us and with this parameter set to its default value no filtering is applied. This parameter can be modified from its default value to apply a first order filter to the input to remove noise. 

See Analog Input 1 Filter Time Constant (07.063).