Class1 119971 - Twister Electronic Throttle ANALOG - 120478 EXTERNAL - Manual (Page 11)

FORM-ENG-0018 REV A 05-27-03
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TECHNICAL DATA SHEET
PAGE 10 OF 16
DATE 10/1/2010
PRODUCT GROUP THROTTLE CONTROL P/N 119971 REV 1.20
PRODUCT Twister Electronic Throttle (Analog version) BY AMS
Manual P/N 120478
5. Operation
5.1. Initialization
The Twister uses a two (2) second initialization cycle. The green throttle ready LED and blue active LED will be ON
during the initialization. The Twister will then begin normal operation.
Figure 5. Twister initialization.
5.2. Interlocking (enabling the Twister)
The Twister will not allow control of the engine speed until the interlock input (pin 3) has been activated. The interlock
input is activated when the proper voltage level is applied. The interlock voltage can be configured for system voltage
(default) or system ground (see section 0).
Figure 4 illustrates a typical interlocking scheme with the Twister’s interlock configured for system voltage. In this
example the OEM makes certain that the park brake and transmission are in the proper modes before allowing
system voltage to pass through to the Twister’s interlock input (pin 3).
Figure 6. Twister interlocking example.
The Twister’s green throttle ready LED will be ON when the proper voltage is applied to the interlock input. This
indicates that the Twister is ready for operator initiated control via the control knob. Refer to table Table 1 in section
3.2 for a description of the throttle ready LED status indication.
The OEM is responsible for creating a safe interlocking scheme to enable the Twister.