Twin Disc HP 300, 600 service manual - Morbark

Operation
38
GP Control Valve Electronic Control Interface (Profile Module)
Twin Disc, Incorporated
The electronic portion of the GP Control Valve must be remotely mounted from
the hydraulic portion of the GP Control Valve, because of the ambient
temperature in most applications.
If the ambient temperature of this mounting location exceeds 82 o C.
(180 o F.), the Electronic Control Interface must be relocated to a cooler
area. See Remote Mounted Electronic Control Cable in the Installation
Section of this manual
This module contains the electronic circuitry to control the proportional cartridges
that are used to engage the clutch and brake, based on the commands from
the operator, and the programmed logic. Clutch apply pressure rate of rise
(profile) is factory set with the use of internal circuitry. Closed loop logic is used
for all clutch engagements. There are no user adjustments on the HPTO Profile
Module. All electrical wiring for the Hydraulic Power Take Off system controls
are routed through this interface module. The machine’s battery power (12 vdc
or 24 vdc) is supplied to the electronic interface only, and never directly to the
hydraulic proportional valves. Two red led lights are used to identify the
proportional cartridge valve that is energized, and a green led is used to identify
when power is provided to the electronic module. Flashing lights are used in
troubleshooting. Engine speed and clutch output speed sensors are required
for the control logic. The following figure shows the Electronic HPTO Module.
Do not connect valve coils directly to battery power supply voltage.
Use an approved Twin Disc Control System.
Figure 7. Electronic HPTO Module
Power Take-off Service Manual