Parker EME
Sizing of fuse F3
21
192-300300N1 GVI Frames C, D & E 2019-9
7.9
Sizing of fuse F3
The fuse F3 (Figure 10) is part of the HIGH_SIDE_IN/PRE_CHARGE protection (see chapter 8.9.1).
Recommended fuse: 6-10 A time-lag fuse (size depending on the load in the circuit).
7.10 Main contactor
The main contactor in a vehicle functions both as a power distribution component and as a key component in
the motor controller protective interlock circuit.
During start-up (after voltage has been supplied to the KEY_INPUT of the motor controller), the motor
controller monitors the voltage of the capacitor bank. When the voltage over the capacitor bank has reached
a pre-defined level, the motor controller will indicate that it is ready to switch on the main contactor. The
motor controller may be configured to control the main contactor directly, with the functionality described
above.
The main contactor should be de-energized if motion is not permitted as a result of some error/fault
condition.
Selection and sizing of the main contactor circuit is the OEMs responsibility. The following power output vs.
DC input current relationship may be used when sizing a main contactor and associated cabling:
I
DC_IN
=
Output power
[
kVA
]
×1 000
V DC
7.11 Preventing reversed polarity connection
The power terminals shall be protected against reverse polarity even though the logic pins of the motor
controller already are.
Make sure that the battery polarity is correct and do not activate the main contactor until the capacitors are
charged up to the predefined voltage. The capacitors will not charge to the proper level if polarity is reversed.
7.12 Emergency stop switch
A manually operated Emergency Stop switch is required for most applications. When activated, the
emergency stop switch de-energizes the main contactor, removing battery power from the power conversion
section of the motor controllers.
NOTE
Note that when removing power in this manner the motor controller cannot stop motion or
produce any braking action.
