Idex Hale Sam, Technical Manual

Page: 50 / 223

30
the pumps discharge pressure as set at SAM Pump Control (Operators) Panel similar to tradi-
tional governor operations. The following governor modes are provided by SAM:
PSI Mode
PSI mode displays the pump pressure set point and actual pressure for operator control. PSI
mode is the default governor mode when SAM exits automated water only or FOAM pumping op-
erations.
Low Intake Pressure Mode
Low Intake Pressure Mode is a subset of PSI mode that ONLY exists in Auto Mode. This mode at-
tempts to maintain water pressures in a manner as to not place a vacuum on the intake (LDH
and/or supply – hydrant).
RPM Mode
RPM mode displays the apparatus engine speed set point and actual speed for operator control.
RPM mode is the default governor mode when SAM exits automated CAFS operations.
2.4.9.1
Emergency Idle Switch
The Sam system utilizes a shrouded, normally open, momentary switch collocated with every aux-
iliary SAM Control Center. The switch shroud is provided to prevent inadvertent activation.
Do NOT attempt to R&R an emergency idle switch before seeing paragraph 4.4.4
(page 56) to
prevent assembly damage and for other panel information.
2.4.9.2
Twister Electronic Throttle
In addition to the SAM Pump Controller (Manual Mode) governor interface, SAM provides a tradi-
tional Twister electronic throttle controller on the SAM Pump Control (Operators) Panel.
Use revision 3.2 (or newer) ONLY for a SAM system, older versions require special setting or are
not compatible with SAM at all.
Do NOT attempt to R&R a Twister before seeing paragraph 4.4.5 (page 57) to prevent assembly
damage and for throttle revision identification.
2.4.10
SAM Speaks
SAM utilizes four (4) speakers and a four (4) channel audio amplifier to produce the spoken/en-
hanced audible alert/caution/warning in the form of a verbal announcement when the SAM Con-
trol Center requires operator attention. In addition, a ground loop isolator is utilized between the
Pump Controller and the audio amplifier to prevent buzz and/or distortion.
See section 4.10, Removal And Replacement Of Miscellaneous SAM Components (page 108), for
additional information.
2.4.10.1
Audio Amplifier And Ground Loop Isolator
The SAM Pump Controller provides audio output to the ground loop isolator and then the audio
amplifier input.
Do NOT attempt to R&R the audio amplifier before seeing paragraph 4.10.1 (page 108) to pre-
vent amplifier damage and for other amplifier information.
See section 4.15 (page 145) to check/test the amplifier.