Murphy RP75 User Manual

RP-95028B/N Revised 09-07
Catalog Section 40
(00-02-0106)
Rack Puller for Diesel Engines
Model RP75
Pulls Injection Pump or Air Intake Shut-off Lever
30 lbf (133 N) Operating Force
Models Available for 12 or 24 Volt Systems
Operates on Signal from SWICHGAGE
®
Installed on the Engine or Driven Equipment
Description
The RP75 rack puller is a semi-automatic device that provides a pulling force to initiate shutdown of diesel engines and equipment.
The RP75 connects to the injection pump or air intake shut-off lever via a cable (chain optional). A coil spring, within the RP75, is reset manually and is held in place by an electromagnet. When the SWICHGAGE®detects a malfunction, the electromagnetic circuit is interrupted through a Magnetic Switch–releasing the coil spring thus pulling the cable/chain to actuate shutdown. The spring, when fully compressed, exerts a pull of 30 lbf (133 N).
The RP75 is available for 12 or 24 VDC applica­tions and is compatible with all SWICHGAGE
®
instruments.
Specifications
Operating Force: 30 lbf (133 N) maximum,
10 lbf (44 N) minimum.
Coil Voltage: Specify 12 or 24 VDC. Coil Resistance: RP75-12: 32.2 ohms.
RP75-24: 129.8 ohms.
Length of Travel: 1-7/8 in. (48 mm). Control Linkage
Cable: 4ft. (1.22 m); Optional 8 ft. (2.43 m)
or 12 ft. (3.65 m) available.
Chain (optional): 30 in. (762 mm).
NOTE: Specify options when ordering.
Shipping Weight: 5 lbs 3 oz. (2.4 kg). Shipping Dimensions: 9-1/4 x 8-1/4 x
5-1/4 in. (235 x 210 x 133 mm).
Dimensions
How to Order
Specify model number.
RP75 – ____ – ____
Service Parts
Specify part number.
Part Number Description
40-00-0021 12 VDC core assembly 40-00-0044 Shaft solenoid assembly 40-01-0050 Bushing shaft assembly 40-01-0053 Case repair kit 40-01-0054 Cocking rod, bushing and
knob repair kit
40-05-0136 Spring, main actuating 40-05-0149 Spring, cocking rod return 80-04-1030 2 Screws, machined #10-24
x 3/8 pan HD steel CAD II
40-00-0024 24 VDC core assembly
Warranty
A limited warranty on materials and workmanship is given with this FW Murphy product. A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm
Voltage
12 = 12 VDC 24 = 24 VDC
Calibration
Blank = 4 ft. (1.2 m) cable 8 = 8 ft. (2.4 m) cable 12 = 12 ft. (3.7 m) cable C = Chain 30 in. (762 mm)
Reset Knob and Stem
3-1/4 in. (83 mm)
10-1/4 in. (260 mm)
3-3/4 in. (95 mm)
1-1/4 in. (32 mm)
2-3/8 in. (60 mm)
Wiring Terminals
Mounting Studs 1/4-20 (4 places)
Side View
Rear View Mounting Hole
Dimensions
5-1/2 in.
(140 mm)
RP-95028B/N page 2 of 2
Mounting
1.
Mount the RP75 using a mounting bracket as illustrated in Figure 1 (see page 1 of this bulletin for mounting hole dimen­sions.). If installing the RP75 to an engine com­partment firewall, go to Step 2.
2.
If installing the RP75 to an engine compartment firewall, drill a 37/64 in. (15 mm) diameter hole in the firewall (see Figure 2).
3.
Remove the reset knob on the RP75 by loosening the allenhead screw on the knob.
4.
Remove the mounting nut and insert the RP75 reset stem through the hole from the back of the firewall.
5.
Replace the mounting nut and tighten. Reinstall the reset knob.
Typical Wiring Diagrams
Wire the RP75 appropriately (see Figure 3). NOTE: RP75 is voltage rated; do not apply 24 VDC to 12 VDC model and vice versa. Also, the 117PH Magnetic Switch is rated for both 12 and 24 VDC circuits but voltage must be specified when ordering the 518PH or 761APH Magnetic Switches.
Installing Cable or Chain
1.
To install the control linkage (cable or chain), apply voltage to the RP75. Push in the reset knob. If installing the cable, insert the cable attaching nut into the RP75 and tighten snugly (see Figure 1). DO NOT OVERTIGHTEN or threads may strip. Attach and tighten outer cable securing nut. If installing the chain, attach the “S” hook to the RP75 (see Figure 1).
2.
Attach the other end of the cable or chain to the injection pump or air intake shut-off lever so it moves freely without sharp bends and without binding.
Operation Test
NOTE: Some method must be provided to disconnect (lockout) all normally closed SWICHGAGE
®
circuits when starting (such as
through the appropriate Magnetic Switch).
1.
Reset magnetic switch.
2.
Push in RP75 reset stem until coil latches the trip mechanism.
3.
Start engine and observe that all locked out contacts clear.
4.
With engine running, ground SWICHGAGE
®
contact. The Magnetic Switch will trip thus removing voltage to RP75. The engine should shutdown immediately. If the engine does shut­down, adjust control linkage (cable or chain) to ensure that shut­off lever travels the full length in both directions.
Installation Instructions
WARNING
Before beginning installation of this Murphy product:
Disconnect ALL electrical power to the machine.
Make sure the machine CANNOT operate during installation.
Follow all safety warnings of the machine manufacturer.
Read and follow all installation instructions.
Firewall
Reset Knob
Mounting Nut
Reset Stem
Allenhead Screw
Figure 1
Figure 2
Figure 3
CAUTION: Shut-off lever should not pull hard
against the stop in the “off” position.
WARNING
: The
firewall must be capa­ble of withstanding the
push and pull force of the RP75.
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819 Rosenberg, Texas 77471 USA Phone: +1 281 633 4500 Fax: +1 281 633 4588 E-mail: sales@fwmurphy.com
FRANK W. MURPHY, LTD
Church Rd Laverstock Salisbury SP1 1QZ UK Phone: +44 172 241 0055 Fax: +44 172 241 0088 E-mail: sales@fwmurphy.co.uk Web site: www.fwmurphy.co.uk
COMPUTRONIC CONTROLS, LTD
41 - 43 Railway Terrace Nechells Birmingham B7 5NG UK Phone: +44 121 327 8500 Fax: +44 121 327 8501 E-mail: info@computroniccontrols.com Web site: www.computroniccontrols.com
FW MURPHY INSTRUMENTS (HANGZHOU) CO. LTD
77 23rd Street Hangzhou Economic & Technological Development Area Hangzhou, Zhejiang 310018 China Phone: +86 571 8788 6060 Fax: +86 571 8684 8878
FW MURPHY
P.O. Box 470248 Tulsa, Oklahoma 74147 USA +1 918 317 4100 Fax: +1 918 317 4266 E-mail: sales@fwmurphy.com
INDUSTRIAL PANEL DIVISION
Fax: +1 918 317 4124 E-mail: ipdsales@fwmurphy.com
MURPHY POWER IGNITION
Web site: www.murphy-pi.com
www.
fwmurphy
.com
Printed in U.S.A.
Magnetic Switch Energized to Run
Mounting Bracket
Cable Attaching Nut
“S” Hook
Wiring
Reset Knob and Stem
Push to Latch
Lockwashers (4 required)
1/4-20 Nut (4 required)
Terminals
Chain
Outer Cable Securing Nut
Time Delay On Start
GBSN.O. N.C.
RP75
761APH
Battery
SWICHGAGE®
117PH
CSB
RP75
Magnetic Switch Energized to Run
518PH
GBSW1 SW2N.C.
Battery
SWICHGAGE®
Battery
RP75
SWICHGAGE®
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