Danfoss Vacon NXP Applications Manual page 136

134 · vacon
F73 Supply Frequency
Supply frequency is not inside of set hysteresis, set in G2.9.7. Not to be confused with OPT-D7
protections that will give F93 D7 Frequency.
Possible cause:
- Slow power increase in a grid and limit controllers activated.
- Power or current limits too low for the active load.
- Not sufficient DC voltage to keep grid voltage, compensated by lowering Supply Frequency to
avoid reactive current.
Correcting measures
- Check drive dimensioning against grid power requirements.
- Check that power or current limits are sufficient.
- Check that sufficient DC voltage is available for the unit.
F80 Charging Fault
The drive has not reached the required DC voltage at time set to MCB.
Possible cause:
-
Charging circuit not operational.
-
High load in DC link.
-
Low voltage in supply for charging circuit.
Correcting measures:
- Check charging current
F81 External Fault 2
Digital input fault.
Possible cause:
Correcting measures:
- Remove fault situation from external device.
F82 Start Failed
MF mode second drive has not stared within set time.
Possible cause:
Correcting measures:
F83 Over Load
Over Load protection has reached tripping limit. See Chapter 5.9.9 Over Load Protection.
F89 Grid Side Fault
In Master-Follower Mode Grid side drive has an active fault that is shown in master drive as a fault.
Possible cause:
Correcting measures:
9
Tel. +358 (0)201 2121 • Fax: +358 (0)201 2121 205
Fault codes