674 参数 Datasheet PDF下载

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OPERATING INSTRUCTIONS

FORM #1492 (REV. B) 9/00

HYFIRE

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VIIC CONTROL UNIT

PART NO. 674

RPM Switch:

NOTE: This feature is not available on the HYFIRE

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667C. The built-

in RPM switch can either turn an electrical load off or on at a selected

RPM. See below for more detail.

NC

RPM Limiters:

The HYFIRE

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667C has three built-in RPM limiters. Each one has a range of

1000 to 12,800 RPM in 50 RPM steps. On the main display, there is a decimal

point on the mode digit. When that decimal point is lit up, the RPM limit is

increased by 50 RPM.

C

NO

This is the RPM switch (mode 7) relay contact that is normally

closed. In other words, as long as you haven’t reached the point

RPM1

(Mode 1)This is the RPM limit that is always active if you haven’t

where the RPM switch is active, this contact remains connected to

selected any other RPM limit.

the “common” or “C” terminal. You would use this connection if, for

example, you wanted to turn something OFF (such as a nitrous

RPM2

(Mode 2) This is an auxiliary RPM limiter that is activated when you

apply 12 volts to the “RPM2” terminal on the top-side connector.

system) when you reached the RPM switch point. See example 1.

This could be a burnout limiter. When selected, it overrides RPM 1

This is the common terminal for the RPM switch (mode 7) relay in

(the main engine protection RPM limiter). See example 4.

the main unit. It is connected to the RPM switch, where it will switch

the accessory connected to the “NC” terminal OFF, and the acces-

RPM3

(Mode 3) This is the other auxiliary RPM limiter. It also is activated

by 12 volts on the “RPM3” terminal on the top-side connector, and

sory connected to the “NO” terminal ON when the RPM switch

overrides both RPM2 and RPM1. Use this limit as a staging (start-

value is reached. The “C” terminal can be used to switch either to

ing line) RPM limiter. See example 5.

power or ground.

This is the RPM switch (mode 7) relay contact that is normally

High Speed Timing Retards:

open. In other words, as long as you haven’t reached the point RET1, RET2, RET3 (Modes 4, 5, 6) These are all high-speed timing retard

where the RPM switch is active, this contact isn’t connected to the functions that are activated by 12 volts on the appropriate top-side connector

“C” contact. You would use this contact to turn something ON (such terminal. Each higher stage overrides the lower stages, which means that

as a shift light or an air shifter) at a specific RPM. See example 2 you set each stage for exactly the amount of retard you want, rather than

adding up each stage to get the actual retard. See example 6.

and example 3.

NOTE: When you apply 12 volts to RPM2, RPM3, RET1, RET2, or

RET3 the display will switch to show that function. If you have both

an auxiliary RPM limit AND a retard selected, the display will show

the retard value.

See the accompanying illustrations for some examples of how to use the RPM

limiters, the RPM switch, and the timing retard functions.

Push this button to change the mode.

FIGURE 1

Push either of these buttons to change

the value of the mode.

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NOTE: If any button is held down for more

than 1/2 second, the displayed value will

change automatically.

1