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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
NEVER remove the ESS Manual Service
Disconnect plug while current is flow-
ing through it. The High Voltage may
create a long enough ionized gas path,
during circuit interruption, to bridge the
contacts of the switch base and there-
fore continue the current flow. This ion-
ized gas is very hot and can cause
burns, fire and electrical shock.
Using a clamp-on current probe and
DMM, ensure that there is no current
flowing in the cables connecting to the
ESS Manual Service Disconnect plug.
7. Remove all the ESS Manual Service Dis-
connect plugs as follows:
a. Press the locking tab and rotate the
MSD lever 45°.
See “Fig. 6: Manual
Service Disconnect - 1” on page 6.
Fig. 6: Manual Service Disconnect - 1
b. Press the locking tab and rotate the
MSD lever to the 90° position.
See “Fig.
7: Manual Service Disconnect - 2” on
page 7.
c. Remove the Manual Service Discon-
nects.
See “Fig. 8: Manual Service Dis-
connect - 3” on page 7.
d. Install a yellow insulating cover, that is
open circuited in the Manual Service
Disconnect receptacle and lock it in
place.
☞
NOTE:
Removing the Manual Service Discon-
nects reduces the ESS voltage but each
battery within the ESS remains a high volt-
age hazard at 88 volts.
8. Ensure that insulating covers are installed
in all ESS Manual Service Disconnect
receptacle locations.
9. Stow the removed MSDs in a locked loca-
tion to which only you have access.
10.Disconnect the high voltage cables at the
HV Junction Box on the side of the ESS.
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