Carrier D2-3466-2 Manuale Utente
Troubleshooting the Drive
6-5
Table 6.1 – Resistance Checks
Input
Diode
No.
Meter
Connection
(+) (-)
Component is OK if
resistance (R) is:
Component is defective if:
1
* SCR1
10 < R < 1 megohm
Continuity (short circuit) or
open when the meter is
connected with reversed
polarity.
open when the meter is
connected with reversed
polarity.
2
* SCR2
3
* SCR3
4
* SCR4
5
* SCR5
6
* SCR6
7
SCR1 **
8
SCR2
**
9
SCR3
**
10
SCR4 **
11
SCR5 **
12
SCR6 **
* (+) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal
Table 6.1 - Resistance Checks (Continued)
IGBT
No.
Meter
Connection
(+) (-)
Component is OK if
resistance (R) is:
Component is defective if:
1
* W/T3
10 < R < 1 megohm
Continuity (short circuit) or
open when the meter is
connected with reversed
polarity.
open when the meter is
connected with reversed
polarity.
2
* V/T2
3
* U/T1
4
W/T3 **
5
V/T2 **
6
U/T1 **
* (+) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal
** (-) DC Bus Volts power terminal