In high-pressure construction environments, skipping a single step during the morning startup can lead to costly downtime or even catastrophic equipment failure. Whether you are operating an HZS90 in the heat of Saudi Arabia or a mobile plant in Southeast Asia, a disciplined startup sequence is your first line of defense against electrical surges and mechanical stress.

The Importance of Sequential Power-Up

Modern concrete mixing stations rely on sensitive PLC (Programmable Logic Controller) systems and high-torque motors. Sudden power loads or improper sensor calibration during startup are the leading causes of "ghost errors" in the control room. Following this 8-step protocol ensures all components—from the air compressor to the twin-shaft mixer—are synchronized.

Phase 1: Electrical & Control System Initialization

Before any mechanical movement occurs, the electrical integrity of the plant must be verified.

• Step 1: Main Power Check. Ensure the emergency stop and key switches on the console are disengaged. Verify the plugboard status and close the main power switch in the electric control cabinet under no-load conditions.
• Step 2: PLC & UPS Activation. Re-engage the key switches. Confirm that the PLC and instrument displays are active. Crucial: Always turn on the UPS (Uninterruptible Power Supply) before the computer to protect the batching software from voltage fluctuations.
• Step 3: Mode Selection. Set the "Automatic/Manual" toggle to the "Automatic" position for standard production, or "Manual" for maintenance testing.
• Step 4: Discharge Safety. During automatic initialization, ensure the discharge gate switch is set to "Prohibited" to prevent accidental concrete release before the transit mixer is in position.

Phase 2: Pneumatic & Mechanical Activation

Once the logic systems are live, the physical components must be brought online in a specific order to manage load distribution.

Component	Requirement/Action	Technical Note
Air Compressor	0.7 MPa Pressure	Essential for pneumatic gate operation.
Mixing Host	No-load start	Check for unusual vibration or noise.
Conveyor Belts	Inclined then Flat	Ensures the path is clear for aggregate flow.
Limit Switches	Zero Alarm Status	Verify all safety sensors are "Green" on the HMI.

3 Common Startup Red Flags

If your operators encounter any of the following during the startup sequence, halt operation immediately:

1. Pressure Drop: If the air source cannot maintain 0.7MPa, check for leaks in the pneumatic lines, especially in high-heat regions where seals can degrade.
2. PLC Communication Error: Often caused by improper shutdown the previous day. Restart the control software to re-sync with the I/O modules.
3. Belt Misalignment: Cold starts in humid climates can cause belt slippage. Check tension before the first batch of aggregate is loaded.

Reliable production starts with a reliable routine. For more technical documentation on HZS-series plants or to request a customized operation manual for your site, contact the Xingye Machinery engineering team.