The Chime Master intelliSwing™ Precision bell ringing system consists of a rotary motor with optical rotation encoder and a wall-mounted motor power control unit. This mathematically brilliant motor controller experiments and quickly learns the unique physical properties of your bell then carefully manages the energy required for perfect ringing and never overshoots the desired swinging angle.

Three phase and single phase bi-directional motors are available with this system. Very large bells are supported with the use of dual motors.


Motors are numbered from largest to smallest when multiple bells are connected.

Sensor feedback

The sensor is mounted on the side of the rotary motor opposite the drive spindle. Four conductor cable connects the sensor board to the motor control panel. The four terminals are labeled:

- (negative 12V)
+ (positive 12V)
D (direction)
P (pulses)

If the panel drives up to four motors, the bell number is on the terminal label too.

Three phase power to motor

The motor output terminals are labeled, W, U and V.

U - switched between L2 and L1 to reverse direction
V - switched between L1 and L2 to reverse direction
W - always fed from L3 power

Three phase motor terminals will have corresponding W, U and V terminals.

Single phase power to motor

The motor output terminals are labeled, W, U and V.

U - switched between L1 and OFF to reverse direction
V - switched between OFF and L1 to reverse direction
W - always fed from L2 power

If the capacitor is on the motor it will be between terminals 1 and 2.

U - connect to motor terminal 1
V - connect to motor terminal 2
W - must be connected to motor terminal 3

We mount capacitors in the panel for linear motors. Connect the capacitor(s) to terminals U and V (no polarity).

U - connect to linear motor leads 1 and 6
V - connect to linear motor leads 2 and 3
W - connect to linear motor leads 4 and 5

Programming the controller


The intelliSwing motor control system must be programmed with the bell at the time of installation. A special hand-held terminal is required for this setup and is available on loan from Chime Master with a deposit.

Precision angle sensing

Either a slotted code wheel with sensors are mounted to the motor or a rotary sensor assembly is coupled to the swinging bell axle for this system to accurately measure the swinging angle and direction.

The label on the motor control computer PCB should read 'SENSOR.' For motors without a code wheel and sensor, a proximity switch is used for motion feedback. In that case, verify that the CPU chip on the intelliSwing Precision motion controller has a label that reads 'PERIOD' and use the MagForce programming procedure.

For each bell we need to calculate the value for Transmission. Take the diameter in inches of the wheel (on the rim where the chain runs) multiplied by 6.28 (π divided by the chain pitch, generally 1/2 inch) and divide the result by the number of teeth on the cog.

For example a 60 inch wheel with a 28 tooth cog will have a transmission ratio value of 13.5. The system will accept values from 5.0 to 45.0.

Transmission = (diameter x (π / chain pitch)) / cog teeth
(60 x (3.14/0.5)) / 28 = 13.5

For belt drives, simply divide the wheel diameter by the motor cog diameter.

Precision Sensor on MagForce motors

For linear MagForce motors with a Precision Sensor rotary sensor on the bell's swinging axle, set Transmission to 22.8.

Using the terminal

The terminal is simply a display and keypad for the control board during installation and setup. All parameters are stored on the control board, and the terminal remembers nothing.


Connect the programming terminal and turn on panel power. The right cursor button will take you through the settings for each bell in the system. From the status window, shown below, you can cursor left to select another bell. To change settings you can increment/decrement using the up and down arrow buttons, or input the value with the numeric buttons and save it with the EXE button.

The two line programming status screen should look like this (first and fourth lines are our labels):

    Swing Angle      Motor Pulse Time      Tempo
         60.4               17           #46.8
         804               *16           Start
     Motor RPM    (*Sensor) Ideal Pulse    Status

When the bell is swinging, the display will indicate the current Swing Angle to the nearest tenth of a degree, the Motor Pulse time in milliseconds, the Tempo in beats per minute, the motor RPM (for rotary) and "*" will blink when feedback from the sensor occurs. The Ideal Pulse is the time in milliseconds that will maintain the desired swinging angle. Status will be Start, Stop, Restart, StartP, Calc-P or Calc-Imp, indicating the swinging/calculation mode.


To reset all settings to default, go left to the Language selection screen and press the DEL button.

Check operation of the sensor. Move the bell by hand and you should hear the phase reversing relay click when the bell reverses direction.

Set Swing Angle and other initial parameters

  • Set Transmission to the supplied value or the ratio you calculated above for rotary motors. Set Transmission to 22.8 for linear motors.
  • Set %Start to 50 if setting up a rotary motor at an angle of 45 degrees or more with an easy to swing bell. After reset, percent of start is 95. You can enter values up to 100. The effects of this parameter depends on the version of software in the controller, so you may need to experiment to get the bell started most efficiently.
  • Set %Brake to zero while in the setup mode to prevent overheating while testing.
  • Set Angle to a modest value like 25.0 degrees to determine the bell swings safely before going higher.
  • Set MaxAmpli to a large value like 90 to 120 (unless there are obstacles the bell might collide with) it will default to ten degrees higher than Angle before auto calculations then 5 degrees higher when testing is complete. A higher value will prevent error shutdowns for exceeding the maximum angle during experimentation (error status = MaxAmpli).
  • P-regulator and I-regulator both default to 50 for fully automatic calculations. You will also get fully automatic calculations for both values if you choose lower, but equal values. First I will be calculated, then after you stop the bell, you will be prompted to restart it for calculation of P. At the end of fully automatic calculations, you will find that the I parameter is zero. You can read the actual value for I from the middle of the lower line of the programmer.

If P is modified manually and I is left at 50, only the I value will be calculated. You will not be prompted to restart the motor after the I has been calculated.

If both parameters are modified, the system will still hunt for its ideal pulse (shown on the display at middle bottom on the main page). In this manual setup mode, stop the bell when you have it swinging properly and then manually set I to zero to save that value so the system doesn't continue to 'hunt' for the best value every time the bell rings.

If the bell is easy to swing a quicker semi-automatic calculation will result with both P-regulator and I-regulator both set to 25. Try the default of 50 first, then change to 25 (with a strong motor) if the CalcImp mode seems to ‘hunt' for a long time. If the motor is suspected to be weak for the bell, increase P.

The automatic calculations should be finished within ten minutes. If it is taking longer and you are happy with the way the bell is ringing, you can terminate the calculations using the current settings. To do this, keep the bell swinging and set I-regulator to zero. The display will change to Swing and you can stop the bell. Make sure it starts correctly with the saved values after coming to a complete stop.

Automatic calculation

The bell needs to swing two times (full automatic setting) so the controller can experiment with the required pulses. These parameters will only be saved after the bell has been rung twice.

The first time it will say Start then Calc-Imp then Swing. After you stop the motor the status display will read Restart.

The second time will say Start then Calc-P then Swing. The calculated parameters are not saved until the status display reads Swing, and then after you stop the motor the status display reads Stop. At this point, the calculated parameters have been saved in non-volatile memory, so power can be safely turned off.

First Swing Experiment

Calculating the ideal impulse

Press ON to start the first experiment. Status on the lower right of the display will read StartP until the system has fired the number of impulses you specified in StaImp. Next it will read Start as it approaches the desired angle. When it begins to search for the ideal pulse, it will read CalcImp.

  • If the bell isn't swinging high enough to ring, but the controller stops sending power impulses to the motor during CalcImp, then increase the Angle parameter. This can be done while the bell is swinging as re-calculation will be performed as you make these changes.
  • If the bell seems to be fighting itself to get started, change Polarity to - (negative). You can reverse the U and V motor wires instead of changing polarity in the program if you want the bell to initially swing the other direction.
  • ErrAmp errors occur if the bell swings higher than the MaxAmpli parameter. Raise that value, or reduce power in the %Start (first) and PowerStaSwi (second if you still have too much power) parameters.
  • If you get ErrBlo (blocked bell), double check the sensor hookup and operation. Double check all motor current connections for integrity (the most common point of failure).
  • When Swing appears on the display, the system has calculated the ideal impulse (middle value on the lower line on the status screen) to maintain the requested angle. If you would like the bell to swing higher or lower, try other values for Angle and MaxAmpli. It will recalculate the ideal impulse based on changes you make at this time.
  • When you like the angle and the display again says Swing you can press ON to stop the bell swinging. Wait for the bell to come to a full stop.
  • The terminal display will indicate Restart to indicate that automatic setup is not yet complete.

Second Swing Experiment

Calculate the over/under Proportional correction factor

The system will not require a second swing if you set P-regulator to a value not equal to I-regulator. It will use your parameters and expect you to verify that your values will work properly.

Press ON to start the second experiment. The terminal display will say CalculP while it is determining the setting for the P-regulator. This is the amount that will be subtracted from the ideal motor pulse when the bell swings too high. It is also added to the ideal motor pulse if the motor swings too low.

When Swing appears on the display, the calculation is complete and you may press ON to stop the bell. Wait for the bell to come to a full stop.

In some cases, the display may continue to say Restart instead of Stop after the second calculation because the motor may not be ideally sized for the bell, so values for P and I could not be found in the normal range. If this occurs, tweak the PowerStaSwi (and maybe P/I-regulator if that doesn't help, see above) parameter and press ON again until you see Swing. You have not successfully finished the setup and the parameters are not permanently saved until you reach status=Swing and then status=Stop after stopping the bell.

Interpreting the results

Calculated values of P-regulator will provide you with information regarding the ease that system has ringing the bell. Low values of P-regulator (< 25) indicate that the motor easily swings the bell. You can reduce PowerStaSwi which is the soft start current limit parameter to pulse the motor more gently.

Testing performance and re-calucuating after making adjustments

Further experiments (first and second swing) must be re-run if you adjust Angle, PowerStaSwi, Pos-Impuls or Transmission after calculations are complete.

Saving the settings

IMPORTANT - The ideal impulse has not been written to permanent memory unless I-regulator is zero. It will automatically go to zero if the system calculated the value. If you entered your own value for I then you will also have to set I-regulator to zero yourself to save it in memory (manual setup mode), then swing the bell again to make sure it works.

Adjustments to %Start, %Brake, PowerBrake1 and PowerBrake2 can be made at this time without having to recalculate ideal pulses. You can test them to be sure the motor overloads don’t pop when this happens.

Do not use braking with retrograde (counterbalanced) clappers. Bell damage from a severe impact may occur if the clapper gets out of phase with the bell and they collide from opposite directions.

Adjust Assym as needed so that the clapper rings evenly on both sides of the bell. In a peal, you should have at least 2 to 3 bpm difference in the Tempo between individual bells. If you cannot accomplish this by modifying swinging angles, then you can add mass to the top of the headstock to slow a bell down.

Stationary Overload Test

After everything else is completed, you can adjust the motor overload (if installed on 1HP and larger motors) current setting to trip within 40 seconds of a locked rotor condition. Click the left arrow (5 clicks) from the Status screen until you get to the Test-PKZ page. Press the ON button to turn on all phases in such a fashion that the motor does not run (simulation of a locked rotor). Then adjust the overload so that it trips before the on-screen timer reaches 40 seconds.

Note that on single phase systems, the L2 supply leg (to L3 on the TRIAC driver board) must be routed through all three circuits of the overload interrupter. Overloads are designed to detect missing phases this way and will trip quickly if one is detected to be missing. This should have been done at the factory unless a three phase panel was ordered. To rewire the overload for single phase,

  • Connect the L2 supply to L1 on the overload,
  • then a jumper wire from T1 to the L2 terminal,
  • then jumper from T2 to L3.
  • Finally connect the overload's T3 terminal to L3 on the TRIAC driver board.
  • The TRIAC board's L2 input terminal is left disconnected.

L1 can bypass the overload on the way to the TRIAC board.

Final Settings

Make a record of the following settings for future reference when setup is complete:

  • Bell Number (1 is the largest bell)
  • Tempo (speed of ringing in beats per minute)
  • Swing Angle (intended angle)
  • Transmission (rotary cog to wheel ratio)
  • %Start (portion of swing angle for starting pulses)
  • %Brake (portion of swing angle of braking pulses)
  • Polarity (correspondence of motor and sensor wiring direction +/-)
  • Brake Angle (angle where brake switches from Power Brake 1 to 2)
  • PowerStaSwi (power reduction using soft-start current limiting 1-8, 9=full current)
  • Power Brake 1 (first brake current limit)
  • Power Brake 2 (second brake current limit)
  • MaxAmpl (maximum angle before error and shutdown)
  • P-Regulator - Proportional regulation factor (amount added/subtracted to pulse to compensate for under/overshoot)
  • I-Regulator - Ideal pulse - (Will be 0 after automatic calculations. Manually set this to zero after manual experimentation, but make a record of what was set)
  • Pos-Impulse (Position of the motor impulse in the sweep of the bell; 0=home 100=turnaround)
  • Assymmetric (Proportion of motor pulse for forward/backward balance; 50 = equal, 100 or 0 = unidirectional drive)

After setup complete

Disconnect the programming terminal. The front panel switches and the Chime Master relays will not activate the motors while the programming terminal is connected.