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local audible (K-4) terminal 20 and 21, remote audible (K-5)
terminal 22 and 23 and remote visual (K- 6) terminal 24 and 25
close to operate the alarm devices wired to them.
7-3.3 An alarm silence pushbutton is wired between terminal 35
and ground. This switch is provided on the A901 and can be
externally connected on the A902 series. When this switch is
closed, the audible alarm relays K-4 and K-5 will drop out if they
are closed. This turns off the audible alarms but does not affect the
individual alarm lights on the panel. The lights will remain on
until the input switches open. If no alarm silence switch is
provided, the alarm relays will reset when the alarm and / or
shutdown lights reset.
Section 8: Service Parts
8-1 Table 8-1 covers all of the replaceable components of the
A900 Series Generator Engine Controls. The part numbers that are
shown are Frank W. Murphy Mfr. numbers, and may not appear on
the individual parts.
8-1.1 Each complete control is made up of a Control/Display
Module, a Relay Module and a number of Relays.
8-1.2 There are no field replacement parts in the Control/Display
Module. The complete module must be replaced if it fails. All
relays are individually replaceable in the Relay Module but the
module must be replaced if a failure of the circuit board occurs.
8-2 Table 8-2 displays replaceable components for the A900 series
controls manufactured for Detroit Diesel Corporation.
These components have Murphy part numbers. In addition, they
are OEM parts and are available only to Detroit Diesel and their
distributors.
8-2.1 The A900-DDC parts are the same as the Murphy A900
series that has been covered throughout the A900 manual except
the “Spare Shutdown” circuit is labeled “Low Water Level” and
the DDC logo is printed on the face plate.
Table 8-1: Replacement Components for A900 Series Generator Engine Controls
Model Number Part Number Control/Display Module Relay Module Relay Part Number Relay Qty
A901-12 40-02-0132 40-00-0077 40-00-0064 00-00-2952 5
A901-24 40-02-0137 40-00-0077 40-00-0064 00-00-2953 5
A901-2-12 40-02-0134 40-00-0078 40-00-0064 00-00-2952 6
A901-2-24 40-02-0140 40-00-0078 40-00-0064 00-00-2953 6
A902-12 40-02-0133 40-00-0079 40-00-0064 00-00-2952 3
A902-24 40-02-0145 40-00-0079 40-00-0064 00-00-2953 3
A902-2-12 40-02-0135 40-00-0080 40-00-0064 00-00-2952 4
A902-2-24 40-02-0148 40-00-0080 40-00-0064 00-00-2953 4
A903-12 40-02-0151 40-00-0081 40-00-0064 00-00-2952 3
A903-24 40-02-0152 40-00-0081 40-00-0064 00-00-2953 3
A903-2-12 40-02-0155 40-00-0082 40-00-0064 00-00-2952 4
A903-2-24 40-02-0156 40-00-0082 40-00-0064 00-00-2953 4
Table 8-2: Replacement Components for A900 Series Controls for Detroit Diesel Corporation
Model Number Part Number Control/Display Module Relay Module Relay Part Number Relay Qty
A901-12-DDC 40-35-0020 40-00-0083 40-00-0064 00-00-2952 5
A901-2-24-DDC 40-35-0029 40-00-0084 40-00-0064 00-00-2953 6
A902-12-DDC 40-35-0022 40-00-0085 40-00-0064 00-00-2952 3
A902-2-24-DDC 40-35-0037 40-00-0086 40-00-0064 00-00-2953 4
A903-12-DDC 40-35-0024 40-00-0087 40-00-0064 00-00-2952 3
A903-2-24-DDC 40-35-0043 40-00-0088 40-00-0064 00-00-2953 4
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