Civil Excavation and Sub-Surface Preparation
Installation of the Swaraj Secutech ST-4 (ST4) crash-rated rising bollard requires structured sub-grade civil preparation tailored to the specific variant selected. Foundation depth and chamber dimensions are governed by cylinder dimensions: variant ST4 A utilizes a 220 mm cylinder diameter with a 700 mm or 900 mm cylinder length, whereas variant ST4 B features a 275 mm cylinder diameter with a 900 mm to 1000 mm cylinder length. All sub-surface components are constructed from high tensile carbon steel and are fully galvanized to resist corrosion, supporting continuous operation even when submerged in water under an ingress protection rating of IP68.
Installers must align the outer casing perfectly flush with the final roadway surface. The bollard foundation must account for vehicle approach vectors in line with its K4 and IWA 14-1:2013 (Bollard V/7200 [N2A] 48/90/0.1) physical impact rating certified by HORIBA MIRA. The stainless steel top plate and external housing—finished in RAL paint or an SS 304 / SS 316 cover sleeve—must remain protected during backfill and concrete casting to prevent structural or cosmetic distortion.
Drive Unit and Mechanical Configuration
The ST-4 series accommodates multiple site layouts across automated, fixed, and removable arrangements:
- Hydraulic and Pneumatic Configurations: Model codes ST4 (A/B)(H/P) designate either hydraulic or pneumatic drive units designed for heavy-duty vehicle access control. Drive systems support a 100% continuous duty cycle and an operational endurance rating of 5,000,000 (50 lakh) Mean Cycles Between Failures (MCBF).
- Fixed and Removable Variants: Model codes ST4 (A/B)(F/R) are utilized for perimeter zoning requiring non-motorized impact containment.
- Manual Lowering Release: Hydraulic circuits must be plumbed and routed to enable the integrated manual lowering operation, ensuring bollard retraction is achievable during power outage or emergency scenarios.
Electrical Mains, PLC Controls, and Signaling
Electrical wiring requires routing line power according to specified system supply requirements: 415 V AC at 50 Hz, 420 V AC at 50 Hz, or 220 V AC at 60 Hz. The drive system connects directly to the dedicated PLC-based control unit. This PLC unit provides tailor-made integration architecture for third-party access control devices, including RFID systems, card readers, biometrics, and manual push-button consoles.
Integrated signaling connections must be routed to activate the bollard head red LED cluster and reflective bands, providing high-visibility visual deterrence across operational ambient conditions ranging from -30 °C to +65 °C (-20 °C to +60 °C rated base range).
Safety Interlocks, Cycle Calibration, and Commissioning
Standard commissioning of the ST-4 automated rising bollard requires testing and calibration of the dual safety sensor interlocks:
- Vehicle Safety Loops: Magnetic loop detectors must be cut into the roadway on the approach and egress to inhibit upward movement while a vehicle is positioned above the pit.
- Pedestrian Safety Photocells: Infrared sensors must be aligned across the roadway perimeter. If an individual or animal crosses the beam path while the cylinder is rising, the PLC interlock automatically drives the bollard down.
- Speed Calibration: Default upward and downward cycle travel is factory set for 5 to 6 seconds (customizable). If equipped with the optional Emergency Fast Operation (EFO) circuit, verify emergency ascent to ensure the cylinder deploys fully within 2 seconds.
- Spare Kit Verification: Verify the handover of the standard spare kit supplied with each unit to support preventative maintenance routines.
