Allen-Bradley PowerFlex 700H Hardware Service Manual page 28

2-12 Component Test Procedures
Should measure -15V dc with respect to DC- with no light in WL cable
Should measure +15V dc with respect to DC- with light in WL cable
Should measure -15V dc with respect to DC- with no light in WL cable
Should measure +15V dc with respect to DC- with light in WL cable
Should measure -15V dc with respect to DC- with no light in UL cable
Should measure +15V dc with respect to DC- with light in UL cable
Should measure -15V dc with respect to DC- with no light in UL cable
Should measure +15V dc with respect to DC- with light in UL cable
Checking the Opto-Couplers
Class 1 LED Product
ATTENTION: Hazard of permanent eye damage exists when
!
using optical transmission equipment. This product emits intense
light and invisible radiation. Do not look into module ports or
fiber-optic cable connectors.
1. On Power Structure #1, locate the fiber optic receiver which transmits
the signals for W High (WH) gate interface and connector X3 on the
Gate Driver Board. X3 provides the gate interface for the WH output
power transistor in the left-hand Output Power Module.
2. Measure the DC voltage at the WH gate and collector pins on X3 with
respect to DC-. It should be -15V dc.
Should measure -15V dc with respect to DC- with no light in WH cable
Should measure +15V dc with respect to DC- with light in WH cable
Should measure -15V dc with respect to DC- with no light in WH cable
Should measure +15V dc with respect to DC- with light in WH cable
3. While shining an intense light (like a flashlight) into the fiber optic
receiver for the WH cable, measure the DC voltage at the WH gate and
collector pins on X3 with respect to DC-. It should be +15V dc. If the
drive fails any of these tests, replace the fiber optic cable or the Gate
Driver Board.
4. Repeat steps 3 and 4 with connector X4 and the VH cable. X4 provides
the gate interface for the VH output power transistor in the left-hand
Output Power Module. If the drive fails any of these tests, replace the
Gate Driver Board.
5. Repeat steps 3 and 4 with connector X5 and the UH cable. X5 provides
the gate interface for the UH output power transistor in the left-hand
Output Power Module. If the drive fails any of these tests, replace the
Gate Driver Board.
6. Repeat steps 3 and 4 with connector X6 and the cables for WL, VL and
UL. If the drive fails any of these tests, replace the Gate Driver Board.
7. Repeat steps 3 and 4 with connector X8 and the WH cable. X8 provides
the gate interface for the WH output power transistor in the right-hand
X6
Should measure -15V dc with respect to DC- with no light in VL cable
Should measure +15V dc with respect to DC- with light in VL cable
Should measure -15V dc with respect to DC- with no light in VL cable
Should measure +15V dc with respect to DC- with light in VL cable
X3