Testing Komunikasi Modbus RTU VFD Vacon 10 Menggunakan Modbus Poll
1️⃣ Tujuan
-
- Menguji koneksi komunikasi Modbus RTU antara PC/Laptop dan VFD Vacon 10
- Membaca data feedback VFD (frekuensi, speed, arus, status)
- Memberikan perintah RUN / STOP dan setpoint frekuensi melalui Modbus
2️⃣ Peralatan
| No | Alat |
| 1 | VFD Vacon 10 |
| 2 | Motor 3 phase |
| 3 | PC / Laptop |
| 4 | USB to RS485 Converter |
| 5 | Software Modbus Poll |
| 6 | Kabel RS485 (A+, B−, GND) |
| 7 | Sumber listrik VFD |
3️⃣ Wiring Dasar
🔹 Power VFD (sesuai gambar)
-
-
-
- L1 – L2/N – L3 → Sumber listrik
- U/T1 – V/T2 – W/T3 → Motor
- Ground motor & VFD wajib tersambung (360° earthing)
-
-
🔹 Komunikasi RS485
|
USB–RS485 |
Vacon 10 |
|
A(+) |
RS485 + |
|
B(−) |
RS485 − |
|
GND |
GND (jika tersedia) |
⚠️ Pastikan tidak terbalik A/B, karena menyebabkan timeout.
4️⃣ Setting Parameter VFD (Quick Modbus Setup)
🔧 Parameter di keypad Vacon 10
STEP 1 – Aktifkan kontrol via Fieldbus
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- P2.1 = 1 → Control place = Fieldbus
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STEP 2 – Setting dasar komunikasi
(Sesuaikan dengan Modbus Poll)
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- Slave ID → contoh: 1
- Baudrate → 9600 / 19200
- Data bit → 8
- Parity → None
- Stop bit → 1
-
5️⃣ Konfigurasi Modbus Poll
-
- Buka Modbus Poll
- Menu Connection → Connect
- Pilih:
- Connection: RTU
- COM Port: sesuai USB–RS485
- Baudrate: sama dengan VFD
- Parity: None
- Slave ID: 1
- Klik OK
Jika benar → Tx/Rx counter bertambah
6️⃣ Testing Output Data (Read Register)
Gunakan Holding Register (4xxxx) atau Input Register (3xxxx) sesuai tabel.
📋 Tabel Register Output Vacon 10
| Fungsi | Register | Keterangan |
| FB Status Word | 32101 / 42101 | Status RUN/STOP |
| FB Actual Speed | 32103 | % speed |
| Motor Frequency | 32104 | Hz |
| Motor Speed | 32105 | RPM |
| Motor Current | 32106 | Ampere |
| Motor Torque | 32107 | % |
| Motor Power | 32108 | % |
| Motor Voltage | 32109 | Volt |
| DC Voltage | 32110 | DC Bus |
| Active Fault | 32111 | Kode fault |
🔍 Contoh di Modbus Poll
-
- Address: 32101
- Quantity: 11
- Function: Read Input Registers (04)
7️⃣ Contoh Perhitungan Scaling
| Data | Nilai Register | Scale | Nilai Aktual |
| Actual Speed | 5000 | 0,01 | 50,00 % |
| Motor Freq | 2500 | 0,01 | 25,00 Hz |
| Motor Speed | 744 | 1 | 744 RPM |
| Motor Torque | 19 | 0,1 | 1,9 % |
| DC Voltage | 1105 | 1 | 1105 V |
8️⃣ Testing Kontrol RUN / STOP
🔹 Control Word (Register 2001)
| Nilai | Fungsi |
| 0 | STOP |
| 1 | RUN |
🔹 Reference Speed (Register 2003)
- Nilai 5000 → 50,00%
- Jika MaxFreq = 50 Hz → output = 25 Hz
🧪 Langkah Uji:
- Write 2001 = 1 → VFD RUN
- Write 2003 = 5000
- Monitor:
- Status = RUN
- Frekuensi = 25 Hz
- Write 2001 = 0 → STOP
9️⃣ Indikator Berhasil
✅ Tidak ada error timeout
✅ Status berubah RUN / STOP
✅ Frekuensi & speed berubah sesuai setpoint
✅ Data feedback terbaca stabil
🔚 Kesimpulan
Komunikasi Modbus RTU VFD Vacon 10 berhasil jika:
-
- Register dapat dibaca
- Control Word merespon
- Scaling sesuai spesifikasi
