Specifications

Curtis PMC 1223/33, 1225/35, 1227/37 Manual
24
SWITCHES AND OTHER HARDWARE
Control Switches
The control switches must be sized to handle a minimum 150 mA of current to
the controller plus the current required for the indicator LEDs and any other
accessories that they drive.
The keyswitch must be an on/off switch. The power enable switch, if one is
used, must be a momentary switch. The direction and mode selection inputs can
be factory-configured for use with either on/off or momentary switches. See
Section 4, page 47, for information on specifying switch styles.
With the exception of the keyswitch input, each control input can be
specified active high (enabled when connected to B+) or active low (enabled
when connected to B-). The keyswitch input must be active high. The recom-
mended configuration is for all the control inputs—except the inhibit input—to
be set active high, although it is possible to specify any desired combination. See
Section 4, page 47, for information on specifying these input polarities.
Keyswitch and Power Enable Switch
Power to the controller can be provided via a single keyswitch or via a keyswitch
and a power enable switch. If a keyswitch alone is used, enabling it will provide
power to the controller’s logic and enable the vehicle for driving. If both a
keyswitch and a power enable switch are used, the keyswitch will provide power
to the controller’s logic but the power enable switch must also be activated in
order to drive the vehicle.
The keyswitch should function as a master switch for the vehicle, to turn the
system off when not in use. The keyswitch provides logic power for the controller
and the other control input switches. An on/off switch must therefore be used for
the keyswitch, and must be sized to carry the 150 mA quiescent logic current plus
the current necessary to drive the precharge function (0.5 A for 0.5 seconds), any
LED indicators, and any other accessories powered from the keyswitch line.
If a power enable switch is used, it must be configured as a momentary
switch, so that the controller can supply diagnostic information via the Status
LED flash codes.
Push Switch
The push switch releases the electromagnetic brake electrically, thus precluding
the necessity for a mechanical brake release. Activating the push input inhibits the
controller’s drive functions until the push switch is turned off. The push-too-fast
feature limits the speed at which the vehicle can be pushed by shorting the motor
if the push speed exceeds the preset threshold. NOTE: The controller must be
connected to the batteries in order to use the push feature.
2 — INSTALLATION & WIRING: Switches, etc.