Grundfos CUE Series Service Instructions

English (GB)
21
4.2 Checking the IGBTs, static test
Always carry out the static test of the IGBTs after each repair.
Before beginning the test:
1. Switch off the mains supply, and wait until the capacitors have
discharged.
2. Remove the supply cable.
3. Remove the motor cable.
4. Set the multimeter to diode test.
The test shown here is actually a test of the freewheel diode of
the IGBT component. If the freewheel diode is okay, it is assumed
that the IGBT component is so too.
Enclosures C1, C2
Measurements
Step 1 Step 2 Step 3 Step 4
DC+ - +
DC- + -
L1 + - - +
L2 + - - +
L3 + - - +
Indication OL OL 0.4 OL
+ = positive test pin
- = negative test pin
Enclosures C3, C4
Measurements
Step 1 Step 2 Step 3 Step 4
DC+ - +
DC- + -
L1 + - - +
L2 + - - +
L3 + - - +
Indication OL OL 0.4 OL
+ = positive test pin
- = negative test pin
+DC
-DC
+DC
-DC
Enclosures A2, A3, A5, B3
TM03 9014 2807
Measurements
Step 1 Step 2 Step 3 Step 4
DC+ + -
DC- - +
U-++-
V-++-
W-++-
Indication OL 0.4 OL 0.4
+ = positive test pin
- = negative test pin
Terminals in enclosures A2 and A3 (shown with
mains supply cable connected).
Enclosures A5 and B3 have similar terminals.
Enclosures B1, B2
Measurements
Step 1 Step 2 Step 3 Step 4
DC+ + -
DC- - +
U-++-
V-++-
W-++-
Indication OL 0.4 OL 0.4
+ = positive test pin
- = negative test pin
DC+
DC-
DC+
DC-

Grundfos CUE Series Specifications

General

Category	DC Drives
Output Voltage	24 V DC
Control Signal	0-10 V, 4-20 mA
Communication	Modbus RTU
Protection Features	Overvoltage, overcurrent, overtemperature, short circuit
Humidity	5% to 95% (non-condensing)
Enclosure class	IP20
Enclosure Rating	IP20