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SMB-189
SERVICE MANUAL BULLETIN
SMB-189
The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2019 New Flyer Industries Canada ULC
Fig. 12: High Voltage Verification - 3
7. Using a clamp-on current probe and DMM,
ensure that there is no current flowing in
the mid-string cable or cables inside the
ESS enclosure.
☞
NOTE:
The battery strings inside the ESS have a
mid-string cable identified with a label.
Removing this cable as a service discon-
nect will reduce the voltage approximately
in half. Each battery remains at a high volt-
age of 88V so continued caution is
required.
8. Disconnect the mid-string cable for all bat-
tery strings located inside the ESS com-
partment.
See “Fig. 13: Mid-String Cable”
on page 11.
9. Remove the cable connectors as follows:
a. Pull tab #1 up.
See “Fig. 14: Release
Connector Tab #1” on page 11.
b. Using an insulated flat-bladed screw
driver, press on tab #2 and release tab.
See “Fig. 15: Release Connector Tab
#2” on page 11.
c. Pull the high voltage connector off the
battery pack.
10.Cover the connector on the cable with a
locking cover to prevent it from being rein-
stalled until after the service work is com-
plete.
See “Fig. 16: Locking Cable Cover”
on page 11.
Removing the mid-string cable will
reduce the high voltage risk but not
eliminate it. Continue to use caution
while disconnecting any other cables
from the batteries or while working on
any other components within the ESS.
11.Repeat this procedure to disconnect the
most positive and most negative cable in
the battery string (or strings) located in the
ESS.
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