User`s guide
Section 1—Hardware Set-Up Bulletin No. VVDED397053US
Bus Voltage Measurement Procedure November 2000
4
© 2000 Schneider Electric All Rights Reserved
The DC bus voltage level is determined by monitoring the (+) and (–)
measurement points. Their location varies by drive controller model
number as listed in Table 2 and shown in Figure 1. The drive controller
model number is listed on its nameplate.
To measure the DC bus capacitor voltage:
1. Disconnect all power from the drive controller including external
control power that may be present on the control board and the option
board terminals.
2. Wait 3 minutes for the DC bus capacitors to discharge.
3. Read the model number of the drive controller from the nameplate
and identify the corresponding (+) and (–) measurement points from
Table 2 and Figure 1 (on page 5).
4. Open the door or cover of the drive controller.
5. Set the voltmeter to the 1000 Vdc scale. Measure the voltage
between the (+) and (–) measurement points identified in step 3.
Verify that the DC bus voltage has discharged below 45 V before
servicing the drive controller.
6. If the DC bus capacitors will not discharge below 45 V, contact your
local Square D representative. Do not operate the drive controller.
7. Replace all doors or covers after servicing the drive controller.
Table 2: (+) and (–) Measurement Points
Drive Controller
ATV58•
(+) Measurement Point (–) Measurement Point
Terminal
Block or
Connector
Terminal
Designation
Terminal
Block or
Connector
Terminal
Designation
U09M2• and U18M2• J2 (+) J2 (–)
U29M2• to D12M2
U18N4 to D23N4
J2 PA J18 7
D16M2• to D46M2•
D28N4• to D79N4•
J2 (+) J2 (–)
VVDED397053USBook Page 4 Tuesday, November 28, 2000 9:01 AM