Danfoss VLT HVAC Drive FC 102 Operating Manual page 122

Operating Guide | VLT® HVAC Drive FC 102
8.4.83 ALARM 88, Option Detection
Cause
A change in the option layout is detected. Parameter 14-89 Option Detection is set to [0] Frozen configuration and the option layout has
been changed.
Troubleshooting
• To apply the change, enable option layout changes in parameter 14-89 Option Detection.
• Alternatively, restore the correct option configuration.
8.4.84 WARNING 89, Mechanical Brake Sliding
Cause
The hoist brake monitor detects a motor speed exceeding 10 RPM.
8.4.85 ALARM 90, Feedback Monitor
Troubleshooting
• Check the connection to the encoder/resolver option and, if necessary, replace the VLT
Input MCB 103.
8.4.86 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.
8.4.87 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].
8.4.88 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.
120 | Danfoss A/S © 2020.01
Maintenance, Diagnostics, and
Troubleshooting
®
Encoder Input MCB 102 or VLT
AQ275556502253en-000101 / 130R0706
®
Resolver