Menu 1 − Speed References

Mode: RFC‑A

Reference Selected (01.001) is the basic reference selected from the available sources including the effect of the percentage trim.

Pre-skip Filter Reference (01.002) is the level of the reference after the reference clamps but before the skip filters.

The Pre-ramp Reference (01.003) is the final output from the Menu 1 reference system that is fed into the Menu 2 ramp system.

For Pump systems, this may be used to set the minimum positive frequency or speed that the Pump can run at that will affect the main process PID feedback, (PID Final Feedback (29.036) or PID Final Feedback Percent (29.035)). Most pumps don't give an appreciable output until up to 50% of their rated frequency or speed is reached.

For pump motors that are not fitted with a force vent, a separate electrically driven fan to cool the motor, the minimum frequency or speed should be set to a value sufficient to allow proper cooling of the motor.

When a Pump Cleaning / deragging cycle is running, Positive Minimum Reference Clamp (01.004) is not used to permit the motor to turn backwards.

When set to 0, and when hand mode is active, positive and negative references will be allowed. When set > 0, and when hand mode is active, only positive references will be possible with a minimum of Positive Minimum Reference Clamp (01.004).

In Auto mode, the minimum speed is defined by Positive Minimum Reference Clamp (01.004).

When Positive Minimum Reference Clamp (01.004) is set >0, there will be a delay before the PID takes control in Auto mode, where the PID output must rise above Positive Minimum Reference Clamp (01.004) to control the motor speed. This delay can be removed by introducing PID feed-forward at the same level as Positive Minimum Reference Clamp (01.004), by configuring PID1 Feed-forwards Reference Source (14.002). See Positive Minimum Reference Clamp (01.004) for further information.

When Pump Control Mode (29.011) = Cascade or Cascade Leader, this defines the intermediate speed / frequency of the leader drive used when removing an assist. The leader speed / frequency is increased when removing an assist to prevent pressure drops. In this situation, the PID reference is disabled temporarily, and the motor runs at the reference specified by this parameter. When the drive reaches the desired value, PID control is resumed. This prevents pressure loss when removing an assist pump, (provided Intermediate Cascade Assist Removal Reference (01.005) is set in-between Sleep Detect Speed Threshold (29.051) and Maximum Reference Clamp (01.006)).

When this parameter is set to 0, there will be no change in leader speed / frequency when an assist is removed.

Maximum Reference Clamp (01.006) provides a limit on the maximum frequency or speed. This is normally set to the rated frequency or speed for the Pump motor.

If Negative Reference Clamp Enable (01.008) = 1 then Minimum Reference Clamp (01.007) is forced to be a negative value and is applied to the final reference as the negative limit. If Negative Reference Clamp Enable (01.008) = 0 then -Maximum Reference Clamp (01.006) is applied to the final reference as the negative limit. The minimum reference clamp is also used to provide the minimum speed limit for uni-polar mode (i.e. Bipolar Reference Enable (01.010) = 0) after the Reference Selected (01.001).

See Minimum Reference Clamp (01.007).

When set to On(1), both positive and negative references will be accepted by the drive.

When set to Off(0), only positive references will be accepted by the drive. Any negative references will be limited to 0.

Note that the Pump and Fan software controls this parameter. When running a cleaning or de-ragging routine Bipolar Reference Enable (01.010) = On(1), for all other operations it is set to Off(0).

See Minimum Reference Clamp (01.007) and Positive Minimum Reference Clamp (01.004).

When set to On(1), Reference On (01.011) indicates that the drive is ready to turn the application motor i.e. there are no trips, (Drive Healthy (10.001) = On(1)) , the drive is enabled, (Drive Enable (06.015) and Hardware Enable (06.029) = On(1)), and a run command has been given, (Run (06.034) = On(1).

Reference On (01.011), which is controlled by the drive sequencer (see Menu 6) indicates that the reference from the reference system is active. Note that Reference On (01.011) is also used in RFC-A and RFC-S modes to enable and disable the Hard Speed Reference (03.022).

Used by the Pump software to select the frequency or speed reference. See the table below for the list of reference selections:

When Pump Control Mode (29.011) = Cascade Leader, if there is more than 1 available pump defined by Assist 1 Ready Input (29.108), Assist 2 Ready Input (29.114), Assist 3 Ready Input (29.160), and Assist 4 Ready Input (29.166), the system will alternate the leader pump when the current leader elapsed Run Time (Alternation Time Elapsed (29.126)) has reached the Alternation Time (29.125) and Post Ramp Reference (02.001) is below .

This defines the speed or frequency reference used when running in Auto mode. The output of  the main process PID, (PID1), is routed to this parameter. See Auto Select Input (29.015) and User PID Controller (14).

This defines the speed or frequency reference used when running in Hand mode and when Hand Mode Reference Select (29.016) = Digital Speed. See Hand Select Input (29.013).

This defines the speed or frequency reference used when the PID has been disabled in Auto mode by PID1 Enable (14.008) = On(1), or when a transducer loss has been detected, Analog Input 1 Current Loop Loss (07.028) = On(1).

When Pump Control Mode (29.011) = Basic this parameter is the speed reference input in auto mode. PID Disabled / Feedback Loss Reference (01.023) may be used in one of the following ways:

1. A static value may be set in PID Disabled / Feedback Loss Reference (01.023) directly
2. A value may be written to PID Disabled / Feedback Loss Reference (01.023) from a PLC over comms.
3. Analog input 1 may be directed to PID Disabled / Feedback Loss Reference (01.023) by setting Analog Input 1 Destination (07.010) to 1.023.

This defines the speed or frequency reference used when the automated pipe filling routine is running. See Pipe Fill Mode (29.075).

This defines the speed or frequency reference used when pump cleaning, (de-ragging), phase 1 is in progress. See Cleaning Phase 1 Time At Reference (29.093), Cleaning Phase 1 Acceleration Rate (02.012) and Cleaning Phase 1 Deceleration Rate (02.022).

This defines the speed or frequency reference used when pump cleaning, (de-ragging), phase 2 is in progress. See Cleaning Phase 2 Time At Reference (29.094), Cleaning Phase 2 Acceleration Rate (02.013) and Cleaning Phase 2 Deceleration Rate (02.023).

This defines the speed or frequency reference used when pump cleaning, (de-ragging), phase 3 is in progress. See Cleaning Phase 3 Time At Reference (29.095), Cleaning Phase 3 Acceleration Rate (02.014) and Cleaning Phase 3 Deceleration Rate (02.024).

This defines the speed or frequency reference used by this drive when it is an assist to the leader drive in a Multi-leader system, Pump Control Mode (29.011) = Multi-leader.

When Pump Control Mode (29.011) = Cascade or Cascade Leader, this defines the intermediate speed / frequency of the leader drive used when adding an assist. The leader speed / frequency is decreased when adding an assist to prevent over-pressure, (provided Multi-leader Assist Reference / Cascade Intermediate Assist Adding Reference (01.028) is set in-between Sleep Detect Speed Threshold (29.051) and Maximum Reference Clamp (01.006)). In this situation, the PID reference is disabled temporarily, and the motor runs at the reference specified by this parameter. When the drive reaches the desired value, PID control is resumed. When this parameter is set to 0, there will be no change in leader speed / frequency when an assist is added.

The skip references functions are available to prevent continuous operation within a specified speed range (i.e. where mechanical resonance may occur). When Skip Reference 1 (01.029) = 0 Filter 1 is disabled. Skip Reference Band 1 (01.030) defines the range either side of Skip Reference 1 (01.029) over which references are rejected in either direction. The actual rejection band is therefore twice that defined by Skip Reference Band 1 (01.030) with Skip Reference 1 (01.029) as the centre of the band. When the selected reference is within the rejection band the lower limit of the band is passed through the filter so that reference is always less than demanded.

Filter 2 (Skip Reference 2 (01.031), Skip Reference Band 2 (01.032)) and Filter 3 (Skip Reference 3 (01.033), Skip Reference Band 3 (01.034)) operate in the same ways as Filter 1.

If any of the filters are active (i.e. the reference is within their rejection band) Reference In Rejection Zone (01.035) is set to 1, otherwise it is 0.

See Skip Reference 1 (01.029).

See Skip Reference 1 (01.029).

See Skip Reference 1 (01.029).

See Skip Reference 1 (01.029).

See Skip Reference 1 (01.029).

See Skip Reference 1 (01.029).

Used to recieve the final analogue speed / frequency reference in Hand mode. By default, analog input 2 T6 is directed to this parameter, and us used when analog Hand mode reference is selected by setting Hand Mode Reference Select (29.016) = Analog Speed.

* A faster update rate of 250μs is possible for the speed reference from an analog input. See Menu 7 for details. Note that this parameter has higher resolution than other frequency parameters in Open-loop mode as this prevents loss of resolution when an analogue input is routed to this parameter with a typical drive output frequency range.

Hand Mode Analog Reference (01.036) should be used as the destination for a drive analog input when to provide a frequency or speed reference. The variable maximum/minimum applied to Hand Mode Analog Reference (01.036) gives the relationship shown below between the final value from the analog input and the frequency or speed reference.

Percentage Trim (01.038) is used to apply an offset to the Reference Selected (01.001).

The final reference is calculated from Reference Selected (01.001) multiplied by [1 + (Percentage Trim (01.038) / 100.00)].

This is used by the Pump Software to select between Hand Mode Analog Reference (01.036) and digital speed references Auto Mode Reference (01.021) to Multi-leader Assist Reference / Cascade Intermediate Assist Adding Reference (01.028).

When set to Off(0), Hand Mode Analog Reference (01.036) is selected.

When set to On(1), Auto Mode Reference (01.021) to Multi-leader Assist Reference / Cascade Intermediate Assist Adding Reference (01.028) is selected. See Reference Selector (01.015) for more information on which digtal speed is selected.

Indicates which speed or frequency reference has been selected by Reference Selector (01.015). See the table below for the list of reference selections:

See Fire Mode Activate (01.054).

Fire Mode Activate (01.054) cannot be written directly, but it can be controlled from a digital input. This prevents fire mode from being enabled from the keypad, comms or an option module.

Fire mode is intended for purging air from a ventilation system in the event of a fire. All trips are either disabled or are automatically reset after 1s. The use of fire mode can result in damage to the drive, and so if fire mode is enabled and any trip is initiated an indication that cannot be reset by the user is stored in Potential Drive Damage Conditions (10.106). For Open-loop, RFC-A or RFC-S modes fire mode is activated and if Fire Mode Reference (01.053) has a non-zero value and Fire Mode Activate (01.054) = 1. When fire mode is activated normal drive operation is overridden as follows.

1. Pre-ramp Reference (01.003) is forced to the value in Fire Mode Reference (01.053).
2. The Final drive enable is forced to be active provided the safe torque off hardware input will allow the drive to be enabled. The Final drive run is forced to be active.
3. Forward Limit Switch (06.035) and Reverse Limit Switch (06.036) are disabled.
4. Hard Speed Reference (03.022) is forced to 0 (RFC-A and RFC-S modes). The hard speed reference should not be used when fire mode can be activated as this could cause an abrupt change in speed.
5. The hand/off/auto system is disabled. If this system is in the hand state when fire mode is activated it will be forced to the off state, so that hand state is not active when fire mode is de-activated.
6. Keypad control mode is disabled.
7. All latched states in the sequencer (Menu 6) are reset.

If the drive is in the tripped state when fire mode is activated the trip is reset and then only the trips listed in the table below can be initiated whilst fire mode is active. If any of the trips shown as resettable occur, the drive will attempt to automatically reset the trip after 1s.