Thanks Alan
Is the internal estop configured to 'trip' with a momentary closing of the estop switch contact on the vfd or does it require the contact be held closed, as in a push pull emergency latching stop switch? I have no resistors added to the external contact, perhaps that is why the function does not work...
Does the condition, as I believe it may be, need to be canceled by the reset contact?
I will add some external resistors. I have read that the boards can fry without them... what can it hurt to add them vs the bad side
)
paul
Recently did a VFD build for another member who had a Huanyang VFD. Manuals are definitely difficult to decipher. I have also read elsewhere that these units (? model) can fail when using the internal braking aggressively. I used a 70 Ohm 300W resistor in the build ($18 on eBay) and the VFD brakes the lathe in ~2 seconds. Without the external braking resistor you will get an over voltage error with fast braking rates. In addition, when using very heavy chucks at high RPM, there is too much momentum in the system to stop the chuck in 1-2 seconds. With the Huanyang I use a 2 second brake time. It is also possible to program another VFD input to select a longer brake time if a heavy chuck is used.
E-Stop in the industrial work setting is a different animal then the hobby machinist, and has a redundancy mechanism. Using the E-stop command structure and input on the VFD terminals can have different results depending on the unit (power disconnect, free-run or emergency braking). The easiest way to implement it on the Huanyang VFD is to disconnect the DCM signal going to For/Rev command usually by interrupting power to the power latching relay. There is also the stop command:
PD024 STOP key
Set Range：0—1 Unit：1 Factory Setting：1
0：STOP invalid.
1：STOP valid.
This parameter set is only valid when PD001 is set to l or 2.
When the control mode is set for external terminals or communication control, STOP key on the
panel can be chosen to be valid or invalid. When choosing it as valid, STOP key can stop the
inverter in running. When it needs to restart, the former running signal must be released before
restarting the inverter.
PD026 Stopping Mode
Set Range：0—1 Unit：1 Factory Setting：0
Two stopping modes are available for the needs of different equipment.
0：Decelerating Stop
When PD030 is set to 0, DC braking is invalid. When DC braking is invalid, the inverter will
decelerate to the stopping frequency, and then stop outputs, and the motor will coast to stop. When
PD030 is set to any non-zero value, DC braking is valid, and the inverter will first decelerate to
the stopping frequency, and then stop by DC braking.
DC braking at stop is usually used for high position stop or for positioning control. It must be
noticed that frequent uses of DC braking will cause over-heat of the motor.
For the related parameters refer to PD028, PD031 and PD030.
1：Coasting Stop
When the inverter receives a STOP command, it will immediately stop output and the motor will
coast to stop. When the coasting stop mode is selected, DC braking is invalid.
You should be able to program the terminals as follows, and if the reset input is not responding, I would recheck the programming/input.
PD044 Multi-input 1（FOR function） Factory Setting： 02
PD045 Multi-input 2（REV function） Factory Setting： 03
PD046 Multi-input 3（RST function） Factory Setting： 10
PD047 Multi-input 4（SPH function） Factory Setting： 17
PD048 Multi-input 5（SPM function） Factory Setting： 18
PD049 Multi-input 6（SPL function） Factory Setting： 19
Set Range：00—32 Unit：No
00: Invalid. The terminal is set for empty to prevent false actions.
01: RUN Running. It can be combined with other terminals to compose multiple
control modes.
02: FOR Forward Rotation
03: REV Reverse Rotation
04: STOP Stopping
05: FOR/REV Switching of FOR/REV rotation
06: JOG Jogging
07: Jog FOR Rotation
08: Jog REV Rotation
09: Emergent Stop： Emergent stop. It can receive external emergent stop command or other
fault signals
10: RST Reset. This terminal can be used for reset after a fault is removed.
I use a Hitachi WJ200 VFD with a 1 second braking and an external braking resistor. The E-Stop button latches and disconnects power to the direction switches by breaking the circuit to the latching power relay and also signals the VFD to stop. This is done through a NC and a NO switch block on the E-Stop. Once the E-Stop switch is released, you need to do a power relay reset for the directional controls to operate. The most important part, is that rotation cannot spontaneous resume once the E-Stop is disengaged or the VFD is reset (i.e. direction switch must be in the stop position). There are different ways to wire this.
