Gardner DELCOS 3100 Controller Field Troubleshooting and Maintenance Guide

3.4 [Limit Values] Menu

Display the limit values set by the factory (usually not modifiable by the user):

Design PRESS: Design Pressure

START Protect: Start protection pressure (below which it is allowed to start)

Final Temperature Warning/MAX: Exhaust Temperature Alarm/Shutdown Value

MIN START TEMPLE: Minimum Start Temperature

RUN-ON TIME: Continue running time after uninstallation

SOFT STOP: Soft Shutdown Time

STAR/DELTA TIME (FS/RS): Star Delta Conversion Time

EXT.LIMIT (SR): External speed limit value

3.5 [INTERNATIONAL INPUTS] Menu

Three backup inputs (OPTION 1/2/3) can be configured, with functional options including: FREE (not monitored) BEKOMAT FAULT/WARN、DRYER FAULT/WARNING、EXT FAULT/WARNING、DISCH TEMP、OPERATE_B1、EXT.RPM LIMIT（SR） Wait. After proper allocation, the controller will monitor these external signals and trigger corresponding alarms.

3.6 [WATCH] Menu

Water cooling system parameters:

Change Cycle: Automatic water change cycle (real-time interval)

SUPLY MAX.: Water replenishment timeout

DRAINAGE MAX.: Drainage timeout

The status display is as follows: "22h y8 y9 Y10><": remaining water change hours, status of each solenoid valve (y not triggered/Y triggered), water level (↑ high/≥ normal/↓ low).

3.7 [TIMER CON] Menu

Set real-time clock and timed power on/off (7 timing blocks) as well as pressure switching (another 7 p2 blocks). When the pressure switch is activated, the p2 symbol flashes before the pressure display. Pressure switching can also be achieved through external contacts.

Common fault codes and troubleshooting methods

DELCOS 3100 has a comprehensive fault self diagnosis function. The following table summarizes the most commonly encountered fault phenomena, possible causes, and solutions on site (based on section 1.5.2 of the manual).

Possible causes and solutions for displaying information

Fault Power Loss: Power interruption, cable damage, loose terminals. Check the power supply, cables, all terminals, and plugs

FAULT EM-STOP emergency stop button is pressed or damaged to unlock emergency stop; Check button contacts

Frequent starting, poor cooling, and high power limit the number of starts per hour for the FAULT MOTOR TEMP motor; Improve ventilation; Check the motor

FAULT COMP TEMP Exhaust Temperature Exceeding Limit Check Cooling System, Environmental Temperature, Temperature Sensor R2

Warning High Temperature: Improve ventilation in the computer room due to high intake temperature and insufficient cooling. Close the chassis door

Fault OVER PRESS: High pressure loss in the pipeline network, high pressure switch point, high external pressure request. Check the pipeline, lower the set point, and check the remote pressure signal

FAULT SENSOR B1/B2/R2 sensor malfunction or wiring damage. Check the sensor and cable and replace them if necessary

Fault Direct ROT motor phase sequence error (no pressure difference during startup phase), swap the two-phase incoming lines

FAULT CONVERTER RS version: The frequency converter is not ready; SR version: CAN communication failure check for variable frequency drive incoming line, filter, internal fan; Check the CAN line and terminal resistance

Final compression pressure is too high when starting FAULT HEAVY STARTUP. Check if the intake control valve is not tightly closed

FAULT SPEED LOW: The minimum speed has not been reached (SR version). Check the connection between the emergency stop circuit and the SR drive and notify the service

FAULT COOLING air cooling: fan failure, air duct blockage; Water cooling: If the cooling water is insufficient or the water temperature is high, check the fan and clean the filter screen; Check the waterway, solenoid valve, and exhaust system

Warning Air Filter: High differential pressure in the air filter. Clean or replace the filter element

Warning OIL LEVEL: Add lubricating oil when the oil level is low

FAULT BYPASS RS Version: Bypass Not Ready Check Bypass Contactor and Control Circuit

Fault SR-DRIVE (1)~(55) SR drive internal faults (see table below for details) are checked according to specific numbers

Warning BATTERY: Real time clock battery depleted, replace RTC module

FAULT LEVELSWITCH water circuit has two liquid level switches closed simultaneously (mechanically impossible). Check the liquid level switches and their wiring

The inspection of the drainage solenoid valve and liquid level switch was not completed during the 1/5 water exchange of FAULT DRAINAGE; Increase DRAINAGE MAX time

Quick investigation of common internal faults in SR drive

Handling of Fault Number Meaning

15 motor overcurrent inspection motor wiring and insulation; Check the current sensor

19. Overvoltage check of intermediate DC circuit power supply voltage (not exceeding 506V between phases)

28/29 Phase loss or undervoltage check incoming fuse, phase sequence, voltage detection circuit

31/32/33 Motor, check the cable and winding of a certain phase for an open circuit

34-39 IGBT faults require maintenance by service personnel

46 motor temperature sensor fault inspection control board J11 plug and sensor

52 CAN Communication Error Check: Control Board to DELCOS CAN Line and Terminal Resistance