Mastervolt

By Erik Zaikin
5 min read


*Fast blink = 2 blinks per second, slow blink = 1 blink per second*

**AC Not Connected:**
1. **Insufficient Irradiation**: No display during daytime.
- **Action**: Contact your installer.
2. **DC Switch in Off Position**:
- **Action**: Move DC switch to the ON position.
3. **DC Fuse Blown**:
- **Action**: Check string fuses.
4. **No PV Power (Voltage Out of Range)**: DC voltage should be between 200-1000V.
- **Action**: Check if the DC voltage is within the required range.

**Grid Faults:**
- **Red LED for AC Frequency High/Low**: Grid frequency out of range.
- **Action**: If this occurs often, contact your installer.
- **Red LED for AC Phase Jump**: Disconnect due to fast frequency fluctuations.
- **Action**: Contact your installer if frequent.
- **Red LED for AC Quality**: Disconnect due to bad grid quality.
- **Action**: If frequent, contact your installer.
- **Red LED for No Grid**: No grid available.
- **Action**: Check the fuses.
- **Red LED for AC Voltage Low/High**: Grid voltage too low or high.
- **Action**: Contact your installer if it occurs often.
- **Red LED for Transient AC Voltage High**:
- **Action**: If frequent, contact your installer.
- **Red LED for Grid Voltage High for 10 Minutes**:
- **Action**: If it happens often, contact your installer.
- **Red LED for AC Phase Balance**: Grid phase balance out of range.
- **Action**: Contact your installer if frequent.

**Hardware Faults:**
- **Red Fast Blink for Hardware Problem**:
- **Action**: Contact your installer.
- **Red LED for HW Insulation**: Insulation fault with low resistance between DC and PE.
- **Action**: Check the PE connections.
- **Red LED for High Temperature**: High internal heat sink temperature.
- **Action**: Wait for the inverter to cool down before it restarts.

**Ambient Faults:**
- **Red LED for Solar Input Over Voltage**: Solar input 1 and/or 2 over voltage (DC > 1000 V).
- **Action**: Check PV array open circuit voltage and contact your installer.
- **Red LED for Solar Low**: Solar 1 and 2 voltage low due to low irradiation.
- **Action**: Check string fuses, DC switch, DC cable, and wait till sunrise.

**Normal Operation:**
- **Red Slow Blink for Reclosure Time**: Reclosure time counting.
- **Action**: No action required; reclosure may take 5 minutes.
- **White ON for Derating**: Power reduction due to various reasons.
- **Action**: Check the fan, MasterBus power setting, and the voltages.
- **White ON for Power Management**: Power reduction by request of the grid operator.
- **Action**: No specific action required unless adjustments are needed.
- **White ON for Solar Input Low**: Solar input voltage 1 and/or 2 low but inverter is operating.
- **Action**: Check the string fuses, DC switch if applicable, DC cable; wait till sunrise.
- **White ON for Normal Operation**: Indicates the inverter is functioning normally.

**StringMaster Faults:**
- **HW Error**: Refer to the StringMaster manual for troubleshooting.
- **Not Connected**: StringMaster has no connection to MasterBus.
- **Action**: Check MasterBus cabling and configuration.
- **Warning**: Refer to the manual for warning descriptions.
- **OC (Over Current)**: Installation error.
- **Action**: Check cabling and scheme.
- **NEG (Reverse Polarization)**:
- **Action**: Check string polarization.
- **LOW Performance**: Current low due to possible issues like shadows.
- **Action**: Check fuse, cabling, irradiation of PV modules.
- **OVP 1 (2) Over Voltage Protection**: On Input 1 or 2.
- **Action**: Check Input 1 or 2 varistor.

### TROUBLESHOOTING

If the problem cannot be resolved using the table below, consult an installer.

**Error LED - Error Code - Meaning - What to do?**

- **Off - NONE** - No error - Nothing; the inverter is operating normally.
- **Off - Insufficient Irradiation** - Nothing. PV module irradiation is insufficient (e.g., at night).
- **Off - No Power from PV Modules** - Consult an installer if the display shows no information during the day. The wiring between the PV modules and the SunMaster might be faulty.
- **Off - WAIT 0:00** - Startup - Nothing. After the SunMaster is (re)connected to the AC network, it checks the network quality before starting normal operation. It may take up to 5 minutes.
- **Off - SOL1 LOW** - Solar input voltage is low - Nothing; normal situation at dawn and dusk. Consult an installer if the problem persists even when PV module irradiation is sufficient.
- **Off - COUNTRY (Flashing Text)** or any country name - A country code has not yet been selected - Select the desired country code (see section 5.3.1).
- **With - TEMP HIGH** - The inverter's internal temperature is high - The air flow of the SunMaster might be obstructed. See Chapter 3.3 for installation instructions. If the problem persists, consult an installer.
- **With - SOL HIGH** - Solar input voltage is high - Contact the supplier.
- **With - NO GRID** - There is no AC network connection - Check the AC network connection. Check the fuse in the meter cabinet.
- **With - UAC LOW** - AC voltage low - The AC network voltage is too low. Consult an installer.
- **With - UAC HIGH** - AC voltage high - The AC network voltage is too high. Consult an installer.
- **With - FAC LOW** - AC frequency low - The AC network frequency is too low. Consult an installer.
- **With - FAC HIGH** - AC frequency high - The AC network frequency is too high. Consult an installer.
- **With - INSULATION** - Insulation failure, leakage current between PV modules and the ground - Consult an installer.
- **With - DC INJECT** - Grid fault, the inverter has detected a fault in the network connection - Consult an installer if the problem persists.
- **With - G QUALITY** - Grid quality fault, the inverter is operating on an unstable network.
- **With - RC PROTECT** - Grid fault, the RCD has detected a fault current.
- **With - ISLANDING** - Anti-Islanding, the inverter has detected an islanding situation.
- **With - BUS VOLT** - Inverter protection, the inverter returns to normal operation mode.
- **With - OCTP** - Network fault, Output protection. The inverter returns to normal service mode.
- **With - OCP** - Network fault, Output protection. The inverter returns to normal service mode.
- **With - OOCP** - Network fault, Output protection. The inverter returns to normal service mode.
- **With - PV OCP** - PV fault, Input protection. The inverter returns to normal service mode.
- **With - PV OCTP** - PV fault, Input protection. The inverter returns to normal service mode.
- **Fast Blinking - NTC FAIL** - Defective device - Note the exact error text. Consult an installer for SunMaster replacement.
- **Fast Blinking - RCMU FAIL** - In the SunMaster, so that it can be replaced.

Models: SUNMASTER Sun Master
ES2.2TL ES3.0TL ES3.6TL ES4,6TL ES5.0TL
IS10 IS15
CS10TL CS12.5TL CS15TL CS20TL CS30TL
XL10K XL15K
XS4300 XS3200 XS2000 XS6500
SOLADIN 1000 1500 I000 I500 600
2200 3000
WEB