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338 Unidrive M Regen Design Guide
Issue Number: 4
The trips can be grouped into the following categories. It should be noted that a trip can only occur when the drive is not tripped or is already tripped
but with a trip with a lower priority number.
Table 12-5 Trip categories
Table 12-6 DC voltage trip and restart levels
12.5 Internal / Hardware trips
Trips {HF01} to {HF25} are internal faults that do not have trip numbers.
If one of these trips occurs, the main drive processor has detected an
irrecoverable error. All drive functions are stopped and the trip message
will be displayed on the drive keypad. If a non permanent trip occurs this
may be reset by power cycling the drive. On power up after it has been
power cycled the drive will trip on Stored HF. The sub-trip code is the
number of the original HF trip. Enter 1299 in mm.000 to clear the Stored
HF trip.
12.6 Alarm indications
In any mode, an alarm is an indication given on the display by alternating
the alarm string with the drive status string on the first row and showing
the alarm symbol in the last character in the first row. If an action is not
taken to eliminate any alarm except "Limit Switch" the drive may
eventually trip. Alarms are not displayed when a parameter is being
edited, but the user will still see the alarm character on the upper row.
Table 12-7 Alarm indications
Priority Category Trips Comments
1 Internal faults HFxx
These indicate internal problems and cannot be reset. All drive features
are inactive after any of these trips occur. If an KI-Keypad is installed it will
show the trip, but the keypad will not function.
1 Stored HF trip {Stored HF}
This trip cannot be cleared unless 1299 is entered into Parameter
(mm.000) and a reset is initiated.
2 Non-resettable trips
Trip numbers 218 to 247,
{Slot1 HF}, {Slot2 HF},
{Slot3 HF} or {Slot4 HF}
These trips cannot be reset.
3 Volatile memory failure {EEPROM Fail}
This can only be reset if Parameter mm.000 is set to 1233 or 1244, or if
Load Defaults (11.043) is set to a non-zero value.
3
Internal 24 V power
supply
{PSU 24V}
4 NV Media Card trips
Trip numbers 174, 175 and
177 to 188
These trips are priority 5 during power-up.
5
Trips with extended reset
times
{OI ac}, {OI Brake}, and
{OI dc}
These trips cannot be reset until 10 s after the trip was initiated.
5
Phase loss and DC bus
power circuit protection
{Phase Loss} and
{Oht dc bus}
The drive will attempt to stop the motor before tripping if a {Phase Loss}.
000 trip occurs unless this feature has been disabled (see Action On Trip
Detection (10.037). The drive will always attempt to stop the motor before
tripping if an {Oht dc bus} occurs.
5 Standard trips All other trips
Drive voltage rating UU trip level Vdc UU restart level Vdc
200 175 215
400 330 425
575 435 590
690 435 590
Alarm string Description
Brake Resistor
Brake resistor overload. Braking Resistor Thermal
Accumulator (10.039) in the drive has reached
75.0 % of the value at which the drive will trip.
Ind Overload
Regen inductor overload. Inductor Protection
Accumulator (04.019) in the drive has reached
75.0 % of the value at which the drive will trip and
the load on the drive is > 100 %.
Drive Overload
Drive over temperature. Percentage Of Drive
Thermal Trip Level (07.036) in the drive is greater
than 90 %.
Limit Switch
Limit switch active. Indicates that a limit switch is
active and that is causing the motor to be stopped.
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