ABB UMC100.3, Manual

Page: 37 / 160

Protection functions can be either on or off. If switched on, they can trigger a protection trip or a warning (excluding the thermal
overload which is always active and triggers a trip). For some functions an optional delay can be specified. Some protection func-
tions are only active after motor start-up while others are active during motor start.
Below is an overview of the available protection functions and when they are active. For details see the following sections.
Protection Function current When active Available Options:
Trip/Warning/Off Automatic Fault
Reset Possible Delay
Electronic Overload Always Trip Yes -
Electronic Overload
Prewarning Always Warning - -
Locked Rotor During motor start Trip / OFF (800%) - x
High Current After motor start Trip/Warning/OFF
separate warning and trip levels
optional delay - x
Low Current After motor start Trip/Warning/OFF
separate warning and trip levels
optional delay - x
Imbalance Always (Motor current > 25%
of I
e
and all three phases
available)
Trip/Warning/OFF
(OFF = only together with phase
loss) separate warning and trip
levels Yes Depending on trip class
2 / 3.5 / 6.5 / 9.5 / 12.5 s
Phase Loss Protection Always (Motor current > 25%
of Ie)
Trip, Off - Depending on trip class
1.5 / 3 / 6 / 9 / 12 s
PTC Protection Always Trip, Warning, Off Yes after cooling
(excluding PTC wire
break and short
circuit) -
Earth Fault Protection Always
After start-up Trip, Warning, Off (255%) separate
warning and trip levels
- x
Load Shedding / Voltage Dip Always
Not in testposition See subsection voltage Dip -
Phase Sequence Protection Always Trip, Warning, OFF - Depending on trip class
1.5 / 3 / 6 / 9 / 12 s
The motor start-up period ends when the motor current drops to 135% of Ie or if the class time (i.e. Class 5 -> 1.5 s,
Class 10 -> 3 s , class 20 -> 6 s, class 30 -> 9 s, class 40 -> 12 s) is over. The class time begins with the start command.
The motor-related and protection-related parameters shall be set according to the motor manufacturer's data sheet. Other para-
meters of the UMC shall be carefully selected based on the process and the system requirements.
37 CO N FI G U R I N G T H E M OTO R P R OT EC T I O N FU N C T I O N S