DigitAx User Guide
Issue code: dgxu4
3-2
3.10 Serial communications
RS485 half-duplex (RS422 can also be used)
Protocol: ANSI x 3.28–2.5–A4–N, positive logic
Timing
Write to Drive:
25ms at 9600 Baud
l5ms at 19.2 kBaud
Read from the Drive:
30ms at 9600 Baud
16ms at 19.2 kBaud
3.11 Resolver specification
Voltage 6V RMS
Frequency 10kHz
Primary Rotor
Number of poles 2
Transformation ratio 0.28 ±10%
Phase shift –14° nominal
Primary current 40mA nominal
Power input 120mW
Electrical error ±15 minutes
Impedance ZRO 73 + j129 Ω
Impedance ZSO 116 + j159 Ω
Impedance ZSS 95 + j162 Ω
Excitation winding
resistance
28Ω
Stator winding
resistance
18Ω
Temperature range –55°C to 155°C
–97°F to 240°F
Inertia 2.0gm
2
x 10
–5
3.12 Resolver resolution
14-bit when Pr99 < 3200 RPM
12 bit when Pr99 ≥ 3200 RPM
3.13 Response times
Scanning rate for speed loop 512µs
Scanning rate for current loop 128µs
Sampling time of analogue inputs 512µs
Rise time of digital outputs 10µs
Speed loop resolution 0.01%
Current loop resolution 10 bits
Speed loop bandwidth 320Hz
Current loop bandwidth 2kHz
Max delay of STOP input 15ms
Max delay of limit switch input 2ms
Max delay of external trip input 5ms
3.14 Electromagnetic
compatibility (EMC)
When all the following conditions are met, the
installation can meet the requirements for
conducted emissions of EN50081-2:
The specified RFI filter (or ferrite absorber ring
and capacitor network) is used
The recommendations for the wiring
arrangements are followed
The motor cable passes through a pair of ferrite
rings (as specified)
Immunity
In accordance with IEC801 without significant
disturbance to operation at the following level:
Part 4 (Transient Burst) Level 3
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