Throttle Fault Detection; Startup Lockout - Curtis 1253 Manual

3 — PROGRAMMABLE PARAMETERS: Fault Parameters
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THRTL FAULT
When the Throttle Fault Detection parameter is programmed On, the 1253
issues a fault if there is a problem with the throttle or its wiring. This parameter
should be programmed Off if there is no throttle in the system, to prevent a
throttle fault from being issued on a nonexistent throttle.
Regardless of how the throttle fault parameter is set, if there is no con-
nection to the throttle the throttle input is assumed to be zero.
If the throttle fault parameter is programmed Off, the throttle input is
assumed to be zero even if a throttle is connected.

STARTUP LOCKOUT

The startup lockout feature prevents the pump motor from running if any of the
speed select inputs (SS1–SS4) is high or the throttle input is outside the neutral
deadband when the controller is turned on. The Startup Lockout parameter is
used to set the type of lockout. Two types of lockout are available: lockout on
KSI input alone or lockout on KSI plus interlock inputs. Startup lockout can
also be disabled.
No Startup Lockout (Type 0)
Startup lockout function is disabled.
KSI-type Startup Lockout (Type 1)
To start the pump motor, the controller must receive a KSI input before receiving
a speed select input or a throttle input outside the neutral deadband. Controller
operation will be disabled immediately if an inappropriate speed request is active
at the time KSI is enabled, and a sequence error fault will be declared. If the
inappropriate speed request is received before the interlock switch is closed but
after the KSI input has been enabled, the motor will accelerate to the requested
speed as soon as the interlock switch is closed. Normal operation is regained by
reducing any throttle request to within the neutral deadband and opening any
speed select switches that were already closed.
Interlock-type Startup Lockout (Type 2)
To start the pump motor, the controller must receive an interlock switch input
in addition to a KSI input before receiving a speed select input or a throttle
input outside the neutral deadband. Controller operation will be disabled im-
mediately if an inappropriate speed request is active at the time the interlock
switch is closed, and a sequence error fault will be declared. Normal operation
is regained by reducing any throttle requests to within the neutral deadband
and opening any speed select switches that were already closed.
Curtis 1253 Manual,
Rev. F