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Curtis PMC 1297 Manual
44
the controller will return to normal operation from this point. If the emergency
reverse direction interlock parameter is set to On, the operator can either open
both direction switches or cycle the interlock switch to enable normal operation.
With the parameter set to Off, the only way for the operator to resume normal
operation is by cycling the interlock switch.
ANTI-TIEDOWN
The
anti-tiedown
feature prevents operators from taping or “tying down” the
mode switch in order to operate permanently in Mode 2 (which is typically the
high speed mode). Upon startup, when the interlock switch is first closed, the
anti-tiedown feature checks which mode is selected. If the mode switch is
requesting Mode 2 (i.e., switch closed), the controller will ignore the request and
default to Mode 1. The controller will remain in Mode 1 until the mode switch is
released and reactivated. Anti-tiedown can be programmed On or Off.
HPD
The
high pedal disable (HPD)
feature prevents the vehicle from driving the
motor if the controller is turned on when greater than 25% throttle is applied.
In addition to providing routine smooth starts, HPD also protects against
accidental sudden starts if problems in the throttle linkage (e.g., bent parts,
broken return spring) give a throttle input signal to the controller even with the
throttle released.
If the operator attempts to start the vehicle with the throttle already
applied, the controller will inhibit output to the motor until the throttle is
reduced below 25%. For the vehicle to run, the controller must receive a KSI
input—or a KSI input and an interlock input—before receiving a throttle input
greater than 25%. Either type of HPD (HPD based on KSI input alone or
HPD based on KSI plus interlock inputs) can be selected via the programmer.
HPD can also be disabled. To meet EEC requirements, the HPD feature must
be programmed to Type 1 or Type 2.
Sequencing delay (see page 57) can be used to provide a brief delay before
HPD inhibits the controller output, if desired.
No HPD (Type 0)
HPD function is disabled.
Interlock-type HPD (Type 1)
To start the vehicle, the controller must receive both an interlock switch input
and a KSI input before receiving a throttle input greater than 25%. Controller
operation will be disabled immediately if throttle demand is greater than 25%
3
A
— PROGRAMMABLE TRACTION PARAMETERS: Other (Traction)
Other Traction Parameters