Gardner Denver DELCOS 3100 Controller

Equipment Overview and Version Differentiation

DELCOS 3100 is a dedicated controller for Gardner Denver oil-free screw air compressors, available in three hardware versions:

FS version: Constant speed air compressor, star delta start

RS version: Variable frequency speed control air compressor, standard frequency converter

SR version: High end variable frequency drive, CAN communication, built-in more protection

Mandatory safety requirement: After the SR version is powered off, it must wait for 12 minutes until the capacitor has discharged before touching electrical components.

Operation panel and display

1. Button functions

Power on, stop, confirm, mute, menu, up, down, left, right, password key

2. LED indicator light (key)

Meaning of LED status

A flashing standby, can automatically start

A normally lit motor is running

Flashing remote control shutdown

F Bright Maintenance Expires

G light alarm

H light fault shutdown

3. Display Area

First line: Final temperature R2, final pressure B2, pipe network pressure B1

Second line: Running status, faults, alarms, maintenance prompts

Supports 17 languages, press ← → to switch.

Menu structure (8 core menus)

MAINTENANCE SCHED. (Maintenance Plan)

Total running hours, loading hours

Countdown for air filter, water filter, and motor lubrication (0-9999h)

Overdue -100h automatic shutdown

Control Menu

Pressure upper and lower limits, target pressure

Automatic/continuous operation, remote, timed, automatic restart

Power off and restart time: 2-999s

RS485: Modbus/baud rate 4800/9600/19200

Fault Memory

Store the last 8 faults, with! Indicates a shutdown fault

Display fault code, description, and occurrence hours

RS/SR supports extended memory: time, status, speed, pressure

Limit Values

Design pressure, startup protection pressure difference, start stop temperature

Run delay of 90s, soft stop of 30s, star delta time of 8s

SR version includes maximum/minimum flow rate and external speed limit

Optional INPUTS (optional input)

3 programmable inputs: drainage, dryer, external faults, exhaust temperature, oil level, etc

Water (waterway)

The water change cycle is 24 hours, the maximum inflow time is 150 seconds, and the maximum drainage time is 150 seconds

Automatic water level regulation, high and low water level protection

TIMER Control

7 sets of power on/off timing+7 sets of pressure switching timing

Support execution by week/date/time

BASE LOAD SELECT. (Multi machine Joint Debugging BLS)

Master slave joint control, up to 1 master and 4 slaves

Pressure range, switching time, number of slaves, number of backup machines

RS/SR can configure the rated flow rate of each slave

Operation mode and control logic

Automatic operation: No delay shutdown required, automatic loading required under pressure

Continuous operation: The motor does not stop, always running without load/load

RS version frequency conversion mode: SPEED REGULATION ON/OFF/BYPASS bypass

SR version drive control: initialization, real-time monitoring of DC voltage and speed

Add/unload logic

FS: Pressure ≥ upper limit unloading, ≤ lower limit loading

RS/SR: Pressure follows target pressure, variable frequency regulation

Remote control function

Remote start stop: Passive contact, distance ≤ 20m

Remote pressure switching

FS version remote loading and unloading

Remote loading allowed (serial enabled)

Automatic restart: Short power outage * * ≤ 2s * * Automatic restart, can be set to unlimited restart

Waterway system control

Automatic water level regulation: high water level automatic drainage, low water level automatic replenishment

Timed water change: Change water according to the real clock cycle

Electromagnetic valve: Y8 water inlet, Y9 drainage, Y10 water cut-off

Fault: Supply, DRAINAGE, abnormal water level alarm/shutdown

Fault and alarm system (core)

1. Shutdown fault (with!)

Power outage, emergency stop, motor overheating, exhaust overheating, low starting temperature

Overpressure, sensor malfunction, phase sequence error, frequency converter malfunction

There are a total of 54 driver faults in the SR version, including overcurrent, overvoltage, communication, and IGBT faults

2. Alarm (without stopping the machine)

High temperature warning, filter blockage, low oil level, low battery, external alarm

3. Fault handling principles

First eliminate the fault source → press the confirm button to reset → restart

Multi machine joint debugging BLS (Base Load Sequestration)

Applicable models: FS, RS, SR

Core competencies: Unified pressure range, automatic rotation, balanced operation hours

key parameters

Pressure bandwidth: ≥ 0.3bar

Switching time: 300s-999h

Number of slave machines: 0-4, backup machines: 0-4

Start delay: 5-30s

Pipeline inflation time: 0-60 minutes

Fault handling: The faulty machine is automatically queued to the end of the queue, and after repair, it is reinserted into the queue

Maintain standards

Can set air filter, water filter, and motor lubrication cycle: 0-9999h

Expired display MAINTENANCE ELAPSED

Overdue -100h: triggers FAULT MAINT PER shutdown protection

Reset the timer and eliminate the fault after maintenance is completed

Key questions and answers

Question 1: What are the core differences between the three versions of DELCOS 3100 (FS/RS/SR)? What air compressors are they used on?

answer:

FS version: Constant speed air compressor, star delta start, only loading and unloading control, no speed regulation function.

RS version: Variable frequency air compressor, supports speed regulation, and can switch between speed regulation/full speed/bypass mode.

SR version: High end integrated variable frequency drive, CAN communication, with 54 drive protections, speed limits, high-precision flow calculation, the most comprehensive safety and functionality.

Question 2: What is the function of multi machine joint debugging BLS? What are the three key parameters that must be considered when configuring?

answer:

BLS is a centralized control function for multiple air compressors, achieving unified pressure, automatic rotation, balanced wear and tear, and energy-saving operation.

Three key parameters that must be set:

Pressure range: upper and lower limit pressure difference ≥ 0.3bar, ensuring stable control

Switching time: Determine the rotation cycle to avoid long-term overloading of a single unit

Number of slave machines+number of backup machines: Define which machines participate in joint control and which only serve as backup machines

Question 3: What are the possible causes and steps for handling the FAULT SR-DRIVE (15) motor overcurrent fault in DELCOS 3100?

answer:

Reason:

Motor wiring error/cable damage

Motor insulation failure

Loose wiring of current sensor

Control board or driver board malfunction

Processing steps:

Check the three-phase wiring and insulation of the motor

Check the wiring and plug of the current sensor

Check the wiring between the drive and control board

Power off reset, if the fault persists, contact the manufacturer’s after-sales service