Checking The Mains Components - Grundfos CUE Series Service Instructions Manual

Overload alarms
I
CUE
I
CUE, 1 minute
I
CUE, max.
I <= I (nameplate)
motor CUE, max.
Fig. 7 Overload alarms

4. Checking the mains components

The check of the mains components of CUE is divided into these
single procedures:
4.1 Checking the rectifier, static test
4.2 Checking the IGBTs, static test
4.3 Checking the IGBTs, dynamic test
4.4 Checking the intermediate voltage
4.5 Checking the current sensor
4.6 Setting the type code.
If it is necessary to replace rectifiers and/or IGBTs, it
is important to clean the heat sink of old cooling
paste and apply an even layer of new cooling paste
over the entire heat sink. Some CUE enclosures
have rectifiers and IGBTs on the power board.
48/16
I 49/13
short
- 200 %
48/9
- 110 %
- 100 %
I
motor
55/59 Overload, current
The pump is overloaded, but the alarm is
not active yet.
55/12 Overload, torque
48/10 Overload, thermal
19