COMBINED PDC/HSC
6. Check alarm status at SCC
5.7 Hydraulic System Center (HSC) Description
The HSC provides hydraulic power for up to 32 Trojan UV3000TMPlus modules, at one time, in any configuration.
Electrical Enclosure
The HSC enclosure is a stainless steel cabinet with separate compartments for hydraulic and electrical components. The hydraulic
components are located through the two side doors. Two-quarter turn latches secure each hinged door. The electrical components are located under the top access door. Latches secure the top hinged door.
Electrical Components
The incoming electrical service terminates at the 40 Amp Disconnect and feeds three-phase power to the hydraulic pump and 24VDC Power Supply, protected by individual Fuse Blocks.
Hydraulic Pump Motor Starter and Thermal Overload
The Motor Starter and Thermal Overload control and protect the pump. The Thermal Overload is located beside the Motor Starter, and senses if the pump is drawing too much current, under which condition the hydraulic overload alarm is set. The dial setting on the Thermal Overload is preset by the manufacturer and should not be modified.
Fuse Blocks Thermal
Overload and Motor Starter Power Supply
Disconnect (40 Amp)
Hydraulic Components
Left Side HSC Service Entrance The hydraulic components consist of the hydraulic pump, pressure switch, low-level float switch, pressure gauge, filter, directional valve and hydraulic reservoir.
The pump is used to pump hydraulic fluid from the reservoir to the manifolds located on the PDC. The solenoid directional valve determines fluid direction.
A sight glass gauge is provided on the reservoir inside the HSC enclosure for checking the hydraulic fluid level.
Right Side HSC Service Entrance Pressure Gauge
The pressure gauge is located on the high-pressure side of the pump. The normal operating pressure is between 150-200 PSI.
DANGER
The pressure gauge should be checked when a high alarm is present at the SCC.
Reservoir Pressure
Gauge
Hydraulic Filter
Motor
Control Valve
High Pressure
Switch
Reservoir Fluid Level Gauge Drain
Plug Pressure
Relief Valve
Low Level Float Switch
Filler Cap
Hydraulic Pressure Switch
If the pressure in the hydraulic line reaches 250 PSI, an emergency stop condition will apply and the hydraulic system will automatically shut off.
The high-pressure alarm relay will be triggered and an alarm will be displayed on the operator interface at the SCC.
If the level in the reservoir falls below the required level for pump operation the low-level float switch will set off a control relay to trigger a low-level alarm on the operator interface at the SCC.
Hydraulic Reservoir
Hydraulic fluid is stored in the reservoir in the HSC. The hydraulic reservoir is a rectangular metal tank located directly beneath the hydraulic pump. The tank is filled using a 6-inch diameter galvanized steel funnel provided in the
operator’s kit.
CAUTION
Use only a Trojan-approved hydraulic fluid. Please refer to MSDS in Appendix or label on reservoir for details.
Specifications
Item Value
Pump 3.0 GPM US
Pressure gauge
0-600 PSI
Reservoir 3.7 gallons
Filter SPE 15-BTA -10 Micron element
B10=75 Synthetic Hydraulic
fluid
Shell Tellus T15,
Refer to MSDS sheets in Appendix B for your site’s Specified Oil.
Operating pressure
150-200 PSI
Low Fluid Level
Low-Level Float Switch
High pressure
250 PSI
Operation
When a wipe sequence is initiated, the pump turns on and the directional control value switches to EXTEND. Hydraulic fluid is pushed through lines that extend from the valve block in the HSC to a manifold found below the PDC.
The individual modules have two hydraulic lines that plug into the manifold. The hydraulic fluid drives an internal piston located inside the rod on each module in a bank. All the modules in a bank (or both banks on double-sided PDCs) are extended simultaneously during a cleaning operation. After the EXTEND operation finishes, the solenoid in the directional control valve switches and the wipers retract.
? HOW TO INFO
Maintenance
Check Pressure Gauge and Reservoir Fluid Level
The hydraulic fluid level should be checked monthly using the sight gauge on the reservoir located in the HSC right side door. The fluid level should be in the top half of the gauge. If the fluid level is in the lower half and is still visible in the sight gauge, the system will still function.
Low level float switch will activate and shut pump down.
Check Pressure Gauge
The pressure gauge should be checked when a low-level or high-pressure alarm is present, or whenever the enclosure panel is open. The pressure should be within the operating range between 150-200PSI.
Flushing and Filling Hydraulic Fluid
During the first two months of operation, as air is working its way out of the system, the hydraulic fluid may need to be topped up. The reservoir is located beneath the pump and is equipped with a removable cap. The funnel included in the operator’s kit should be used to reduce the possibility of spilling fluid in the HSC enclosure.
The hydraulic fluid should be changed every two (2) years to help the system function efficiently.
CAUTION
Use only a Trojan-approved hydraulic fluid. Please refer to MSDS in Appendix or label on reservoir for details.
1. Disable wiping by switching HSC Wiper Mode