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Curtis PMC 1204X/1205X/1209/1221 Manual
controllers. (
: A bypass contactor should not be used with controllers that do
NOTE
not have this feature, as the controller could be damaged when the system comes
out of bypass mode.)
The bypass contactor must be able to carry and to interrupt the maximum
motor current. A coil suppression diode should not be used on this contactor.
Refer to the controller specifications in Appendix C to determine the contact
current requirement for the bypass contactor. The maximum allowed coil
current for this contactor is 1 amp.
Emergency Reverse Relay
A small double-pole, double-throw relay must be installed to implement emer-
gency reverse. Its contact rating must be adequate to switch the current needed
by the forward/reverse contactor coils.
Keyswitch and Interlocks
The vehicle should have a master on/off switch to turn the system off when not
in use. A keyswitch is typically used for this purpose.
An interlock device is necessary for implementation of SRO. With the SRO
option, the vehicle cannot be started or operated without the designated SRO
interlock activated.
Various other safety and convenience interlocks may also be used to prevent
motor operation during certain conditions. For example, a battery charger
interlock can be used to prevent operation during charging. Similarly, a seat
switch can be used to turn the vehicle off when the operator gets up from the
driver's seat. The contacts of these switches should be rated for the total coil
currents of all the contactors they operate.
Polarity Protection Diode
For polarity protection, a diode should be added to the control circuit. This diode
must be sized appropriately for the maximum total contactor coil currents.
Control Wiring Fuse
To protect the control circuitry from accidental shorts, a small fuse (typically 10
amps) connected in series with the B+ feed to the control circuitry wiring is
recommended.
Power Wiring Fuse
To protect the power wiring circuit, a fuse appropriate for the controller's rated
current (see Appendix C) is recommended.
HARDWARE INSTALLATION
10
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