Menu 7 − Analog I/O

Mode: RFC‑S

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

1. Speed Feedback (03.002) has an update time of 4ms and includes a 16ms window filter. If this parameter is selected as a source for output 2 the update time 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 time for both analogue outputs is 4ms.

Analog Inputs
The normal update time for the analog inputs is 250us. If a thermistor mode is selected the update time is increased to 4ms. It is possible to insert a filter in each of the analogue inputs using Analog Input 1 Filter Time Constant (07.063) etc. to reduce the effect of noise on the input. Analog Input 1 Fast Update Active (07.026) and Analog Input 2 Fast Update Active (07.027) indicate if fast 250us updating is active for each input.

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. Not all parameters shown in the diagam below are available in every drive derivative.

Each analogue input has a resolution of 15 bits plus sign. The resolution given in Analog Input 1 (07.001) etc. is limited by the resolution of the parameter to 0.01%. However, the resolution is maintained if the input is routed to a parameter with a range equal to or larger than 32768. For example if an input is routed to Analog Reference 1 (01.036) and the maximum speed is greater than or equal to 3276.8rpm the resolution is 0.1rpm. By default no filtering is applied to the inputs, and so general noise will cause the value to change within the range of the noise. If some delay is acceptable it is possible to filter the inputs using Analog Input 1 Filter Time Constant (07.063) to Analog Input 3 Filter Time Constant (07.065).

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), Analog Input 2 Minimum (07.041) and Analog Input 3 Minimum (07.042) 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.

Analog Input 3 (07.003) shows the level of analogue input 3.

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.

This parameter defines the possible input modes for analog input 1.

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).

See Analog Input 1 Scaling (07.008).

See Analog Input 1 Scaling (07.008).

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

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).

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).

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 parameter defines the possible input modes for analog input 3.

The scaling, offset and invert functions for analog input 3 are defined in the same way as for analog input 1. See Analog Input 1 Scaling (07.008).

The scaling, offset and invert functions for analog input 3 are defined in the same way as for analog input 1. See Analog Input 1 Scaling (07.008).

The scaling, offset and invert functions for analog input 3 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.

See Analog Output 1 Source (07.019).

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).

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.

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.

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).

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).

The scaling, offset and invert functions for analog input 3 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 Power Input 1 (03.010) (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.

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 Analog Input 1 (07.001).

See Analog Input 1 (07.001).

Analog Input 3 Thermistor Type (07.046) defines the operation of the temperature feedback interface for analog input 3 when Analog Input 3 Mode (07.015) is set up for a temperature feedback mode. When a temperature feedback mode is selected a 2mA current source is connected to analog input 3 to supply the temperature feedback device that is connected to the input. DIN44082 and KTY84 devices should always be connected directly to analog input 3. The other devices can be connected directly to analog input 3 if the 2 wire connection option is selected. Alternatively these devices can be used with a 4 wire connection to remove the effect of voltage drops due to the 2mA supply current via the path shown below. If a 4 wire connection is selected analog input 1 is disabled and Analog Input 1 (07.001) always reads as 0.0%. It should be noted that the input system takes account of the input impedance of analogue input 3 when 2 wire mode is used, and of both analogue input 1 and analogue input 3 when 4 wire mode is used. For this reason it is important that 2 wire mode is selected when the connection between Analogue Input 1+ and Analogue input 3 is not present, and that 4 wire mode is selected if the connection is present.

Analog Input 3 Thermistor Feedback (07.047) shows the measured resistance.

Over-temperature detection becomes active for input 3 if  Analog Input 3 Thermistor Feedback (07.047) > Analog Input 3 Thermistor Trip Threshold (07.048). Over-temperature becomes inactive for input 3 if  Analog Input 3 Thermistor Feedback (07.047) <  Analog Input 3 Thermistor Reset Threshold (07.049). If Analog Input 3 Mode (07.015) is 7 or 8 (i.e. tripping is enabled) a Thermistor.003 trip is initiated. The default values for Analog Input 3 Thermistor Trip Threshold (07.048) and Analog Input 3 Thermistor Reset Threshold (07.049) are the levels specified in the DIN 44082 standard.

See  Analog Input 3 Thermistor Trip Threshold (07.048).

If a KTY84, PT100, PT1000 or PT2000 type device is selected for temperature feedback then Analog Input 3 Thermistor Temperature (07.050) shows the temperature of the device based on the resistance to temperature characteristic specified for this device. Otherwise Analog Input 3 Thermistor Temperature (07.050) = 0.0.

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. 

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).

See Analog Input 1 Filter Time Constant (07.063).