Page 2
RCT provides the document to you on an “as is” basis. RCT is not required to provide any updates to this version of the document. RCT may make any change, amendment or modification to the contents in this document without notice to you.
Contents GENERAL SAFETY WARNINGS PRODUCT OVERVIEW FEATURES AND FUNCTIONS OPERATION AND USE CONTROLLER STATUS INDICATOR OPERATION INSTALLATION GUIDE WIRING CONNECTIONS UPGRADE CONNECTION DETAILS EXTERNAL WIRING DIAGRAM (512a) CALIBRATION SERVICE INFORMATION SERVICE SCHEDULE SERVICE PROCEDURE PARTS LIST 12727 KIT, PRE-START WARNING WITH ALARM 12728 KIT, PRE-START WARNING NO ALARM TECHNICAL SPECIFICATIONS COMPLIANCE AND STANDARDS...
Ensure electrical connections are made as per RCT’s recommendations. Test circuits prior to connecting power to any component. ■ The equipment contains no user serviceable parts inside. Return the unit to RCT for repairs. ■ Retain product and installation instructions for future use.
PRODUCT OVERVIEW The Muirhead ® Prestart Warning Controller, part number 12539, is designed to warn personnel that a machine is about to start/crank by activating an alarm for a selected time period prior to allowing the machine to start. The timer is automatically triggered when the ignition switch is turned to the start position. The pre-start time duration is configurable to suit the application.
INSTALLATION GUIDE Install the controller in a suitable location. Refer to the wiring table below and the wiring diagram in this manual to connect the controller. It is recommended that the wiring is installed alongside the OEM wiring ensuring that it is secured at regular intervals;...
UPGRADE CONNECTION DETAILS Refer to the following table if you are upgrading from an older RCT prestart warning timer (part number 2625 and 6337) to the 12539. The following connections can be re-used when upgrading any connections not listed here will still need to be connected as per the previous wiring connection table.
For example, if inputs 1 and 4 are connected to GND and inputs 2 and 3 are not connected the total prestart warning time would be 4+2+16 = 22 seconds. The default pre-start warning time can be adjusted between 4 and 10 seconds via the programmable controller utility program available from RCT. INPUT 1...
PARTS LIST 12727 KIT, PRE-START WARNING WITH ALARM QUANTITY PART NO. DESCRIPTION INCLUDED PARTS SUGGESTED SPARES Controller 12539 12738 Generic Loom 6162 Alarm warning 102 dB 12/24 V 0824 Terminal to suit Alarm 12728 KIT, PRE-START WARNING NO ALARM QUANTITY PART NO.
TECHNICAL SPECIFICATIONS Dimensions, controller only Length: 119 mm | Width: 80 mm | Height/Depth: 65 mm Dimensions, boxed for freight Length: 220 mm | Width: 120 mm | Height/Depth: 120 mm Weight, controller only 255 g Weight, including loom / packaging 600 g for freight Input nominal voltage...
COMPLIANCE AND STANDARDS RCT has an obligation as a manufacturer to comply with the regulations as required by the relevant regulatory bodies, depending on the market and location. This product currently complies with the following: ACMA ■ IEC 61000-6-1:2005 Electromagnetic Compatibility (EMC) – Part 6-1: Generic Standards – Immunity for Residential, Commercial and Light Industrial Environments.
Need help?
Do you have a question about the Muirhead 12539 and is the answer not in the manual?
Questions and answers