BYD PMW20 - Page 88

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●Turn the ignition switch S1 to the third gear, the ignition relay KA5 is energized to supply
power. As shown in Figure 3, the current trend direction of ignition relay KA5 is 1——2
——4——5——6（Ignition switch S1 third gear）.
●At this time, keep the ignition switch S1 to the third gear and the BMS is energized. Supply
power after self-inspection and the current trend direction is 1——2——4——5——8——
9（Ignition switch S1 third gear）.
●Turn the ignition switch S1 to the third gear, the BMS is energized. The charge and
discharge contactor KM1 has a positive pole, and the controller relay KA3 pulls in. The
BMS collects the battery voltage and temperature information and conducts a self-
inspection, then controls the charging and discharging contactor KM1 to pull in and
outputs 24V high voltage from the battery box.At the same time, the 24V power is input to
the main drive controller pin C1 and the handle and other appliances through the
connector G01-6 and the closed contact of the controller relay KA3.
●Release the key and reset the ignition switch S1 to the second gear. During this process,
the ignition relay is always in pull-in status. As shown in Figure 4, the current trend
direction of the entire forklift is 1——2——3——7——8——9 （Ignition switch S1 is reset
to the second gear）.
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8.9.1.6 Process of Power Supply
●The battery's 24V positive pole——Charging relay KA2 contact——Positive
current fuse FU1—— Connector G01-3——Ignition switch fuse FU2——emergency
stop switch S1——Ignition switch S1 first gear. As shown in Figure 1, the current trend
direction is 1——2（Ignition switch S1 first gear）.
●Turn the ignition switch S1 to the second gear, the ignition relay KA5 is not energized to
supply power. As shown in Figure 2, the current trend direction is 1——2——3（Ignition
switch S1 second gear）.
SM-PMW202020001-EN
SM-PMW202020001-EN
Relay of the Power Manager
Charging Relay
Positive Current Fuse 15A
Ignition Relay
Ignition Switch Fuse
Emergency Stop Switch
Ignition Switch
Relay of the Power Manager
Charging Relay
Positive Current Fuse 15A
Ignition Relay
Ignition Switch Fuse
Emergency Stop Switch
Ignition Switch
Charging Relay
Positive Current Fuse 15A
Ignition Relay
Ignition Switch Fuse
Emergency Stop Switch
Ignition Switch
Ignition Relay
Charging Relay
Positive Current Fuse
15A
Ignition Switch Fuse
Emergency Stop Switch
Ignition Switch
Fig. 3
Fig. 4
Fig. 2
Fig. 1