Frequently Asked Questions
What is the encoder resolution of Absolute MDrive?
Is the encoder resolution actually 4000 or 4096 counts/rev?
How many shaft rotations may occur before the multi-turn encoder loses position due to counter over-run?
Motion Control, Ethernet TCP/IP
|To prevent rollover of Idx6062h (Position_demand_counter) an automatic rollback feature has been incorporated. When this counter reaches or exceeds 7/8 of the way (i.e. 70000000h=1,879,048,192), the counter is rolled back by that value. This is done to avoid confusing the internal micro-stepper state machine from interpreting a very positive number (i.e., >2^31) as a negative number and prevents the software routines from doing the same. Please note that a roll back feature is not available on the encoder itself. As a result, if Idx6064h (Position) is based on the encoder, Idx6064h (Actual) value will be offset from Idx6062h (Demand), and a following error will be set.||The encoder counter (C2) is a 32-bit register, meaning the shaft can rotate approximately +/- 41,000 revolutions before losing position.|
How long will Absolute MDrives retain position information?
How many Absolute MDrives can the Battery Pack provide power to?
How long will the optional ICP0531 External Battery Pack allow Absolute MDrive position to be retained?
Are low level warning provisions available on the optional ICP0531 External Battery Pack?
- Yes, the optional ICP0531 External Battery Pack is equipped with a status LED. The LED will flash on every 10 seconds while the internal battery voltage is above the required threshold. If the status LED is not flashing, the internal battery voltage is not sufficient, and internal batteries will need to be replaced.
- The optional ICP0531 External Battery Pack is also equipped with a low battery signal output. The low battery signal output is essentially an open collector. When internal battery voltage is insufficient, the low battery signal output will provide 24 VDC. Internally, we utilize a 5.62K ohm resistor to pull up to 24 VDC. Current is based on the impedance of the input or load.
What are the environmental condition limits for the optional ICP0531 External Battery Pack?
|Temperature (°C)||-25 to 70|
|Temperature variation (°C)||-25 to 30|
|Humidity (%)||5 to 95 (non-condensing)|
What is the Absolute MDrive encoder communication protocol, SSI or EnDAT?
Can Programmable Motion or Ethernet TCP/IP Absolute MDrives provide position via encoder output signals?
Why do I receive error 121?
- An unrecoverable event, such as high internal impedance across absolute encoder circuitry, has resulted in a large voltage spike which has damaged the device.
- Battery backup voltage has been exceeded and damage has occurred on the device. The maximum allowable backup voltage is 6VDC.
Why do I receive error 122?
- Device counters have been reset. If absolute encoder circuitry voltage drops below 3.2 VDC and external battery is below 3.5 VDC, C1, C2, and P counters are reset.
- Position discrepancy due to loss of synchronization. Writing to various counters during operation can cause a loss of synchronization. This error may appear after the synchronization event, such as a power cycle.
Why do I receive error 123?
- hold up time exceeded without the use of the optional external battery pack
- encoder wheel misalignment