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Negative connection to battery
Output to motor field
Curtis PMC 1204X/1205X/1209/1221 Manual
CONNECTIONS: High Current
Four tin-plated solid copper bus bars are provided for the high current connec-
tions to the battery and motor.
B-
M-
The cables used for the battery and motor connections must be heavy enough to
carry the high current required. Rubber insulated welding cable is convenient to
work with because of its flexibility.
Connections to the controller bus bars should be made with lugs suitable for
the cable used, fastened by M8 (5/16") bolts and nuts. When tightening the
bolts, two opposing wrenches should be used. Failure to use the double-
wrench technique could cause undue strain to be placed on the internal connec-
tions, and could also result in cracked seals around the bus bars.
WIRING: TYPICAL INSTALLATION
Curtis PMC 1204X/1205X/1209/1221 controllers are designed to satisfy the
requirements of material handling applications using series motors. Figure 8 is a
schematic diagram of the installation shown in Figure 7. Wired this way, the
vehicle will plug brake if the direction is changed with the vehicle moving and the
throttle applied. Reversing is accomplished via a forward/reverse changeover
contactor or two single-pole, double-throw (2×SPDT) contactors. Coil suppres-
sion diodes should be used on the main and forward/reverse contactors.
KSI Wiring
The keyswitch input (KSI) circuit includes inputs from the keyswitch and from
the various interlocks. The controller KSI is used to turn the controller on and off.
KSI is turned on by connecting it to battery B+. Any positive voltage greater than
about 8 volts will turn on the controller, but usually the full vehicle battery voltage
is used.
In its simplest form, KSI is operated by a keyswitch that turns the vehicle off
and prevents unauthorized use. The keyswitch should also turn off the main
Positive connection to battery
and to motor armature
B+
A2
Plug diode to motor armature
WIRING
12
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