Section 2 – SR-2 Hardware Description
Interface Board Fuse Size & Function
Fuse Size Function
F1 1A HPCO Switch Circuit
F2 15A 2AB Power
F3 40A Fuel Sol Pull-In/Starter Circuit
F4 None
2A
No fuse - all Bosch alternators
2A fuse - all Prestolite alternators
1
F5 60A Preheat Circuit
F6 15A Damper and High Speed Circuits
F7 2A 8FP Circuit – CAN bus
F8 5A CAN Connector J12
F9 5A CAN Connector J14
F10 10A 8X Power - install in upper position
F11 10A Electric Clutch (Not Used)
F12 5A CAN Connector J13
F13 2A 8FC Circuit (Remote Lights)
F15 P/S On/Off Relay
F20 2A Alternator Sense
F22 Not Used
F23 Not Used
Note 1 - The F4 must be in place for Prestolite
alternators to charge. It must be removed for Bosch
alternators. Note: Service parts interface boards
are shipped without F4 fuse.
F10 There are three in-line fuse clips that allow for
two configurations of the F10 fuse. The upper
position is the normal position. When fuse F10 is
installed in the upper position, control power is
routed to the K9 On/Off Relay contacts. The On/Off
keys on the HMI control panel energize and de-
energize the K9 On/Off Relay. When the K9 On/Off
Relay is energized power is supplied through the
normally open K9 contacts to turn the unit on.
When fuse F10 is installed in the lower position
power bypasses the K9 On/Off relay contacts and
the unit will start and run without the HMI control
panel. Do not operate the unit with the F10 fuse
installed in the lower position unless absolutely
necessary.
IMPORTANT
If fuse F10 is installed in the lower position the
unit will start and run. The HMI Control Panel On
and Off keys will not function. The Off key will
not turn the unit off if Fuse F10 is in the lower
position. If Fuse F10 is in the lower position it
must be removed or the Microprocessor Power
Switch must be turned off to turn the unit off.
F15 The device identified as F15 is a poly switch.
This overcurrent device resets automatically and is
not replaceable.
Interface Board Relay Functions
Important: Do not attempt to remove the relays
from the interface board.
Relay Function
K1 Run Relay
K2 Preheat Relay
K3 High Speed Relay
K4 Damper Relay
K5 Diesel/Electric Relay
K6 Fuel Solenoid Pull-In Relay
K7 Starter Relay
K8 Electric Clutch Relay
K9 On/Off Relay
2-12
31 January 2005
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