Danfoss VLT AQUA Drive FC 202 Operating Manual page 126

Operating Guide | VLT® AQUA Drive FC 202
8.4.84 ALARM 90, Feedback Monitor
Troubleshooting
• Check the connection to the encoder/resolver option and, if necessary, replace the VLT
Input MCB 103.
8.4.85 ALARM 91, Analog Input 54 Wrong Settings
Troubleshooting
• Set switch S202 in position OFF (voltage input) when a KTY sensor is connected to analog input terminal 54.
8.4.86 ALARM 99, Locked Rotor
Cause
The rotor is blocked.
Troubleshooting
• Check if the motor shaft is locked.
• Check if the start current triggers the current limit set in parameter 4-18 Current Limit.
• Check if it increases the value in parameter 30-23 Locked Rotor Detection Time [s].
8.4.87 WARNING/ALARM 104, Mixing Fan Fault
Cause
The fan is not operating. The fan monitor checks that the fan is spinning at power-up or whenever the mixing fan is turned on. The
mixing fan fault can be configured as a warning or an alarm in parameter 14-53 Fan Monitor.
Troubleshooting
• Cycle power to the drive to determine if the warning/alarm returns.
8.4.88 WARNING/ALARM 122, Mot. Rotat. Unexp.
Cause
The drive performs a function that requires the motor to be at standstill, for example DC hold for PM motors.
8.4.89 WARNING 163, ATEX ETR Cur.Lim.Warning
Cause
The drive has run above the characteristic curve for more than 50 s. The warning is activated at 83% and deactivated at 85% of the
allowed thermal overload.
124 | Danfoss A/S © 2020.01
Maintenance, Diagnostics, and
Troubleshooting
®
Encoder Input MCB 102 or VLT
AQ275652274277en-000101 / 130R0708
®
Resolver