Configuring AutomationDirect GS1/GS2 Auto-Run at Power Up

Problem: GS1/GS2 Will Not Start on Power-Up with a Jumpered Input

When replacing a legacy Delta VFD (or similar drive) with an AutomationDirect GS1 or GS2 AC drive, a common field issue appears at commissioning: the new drive will not run on initial power-up even when the run command input is hard-wired (jumpered) to the common terminal. The motor sits idle until the start input transitions from open to closed after the drive has already completed its boot sequence.

Typical field symptom set:

• DI1 (digital input 1) hard-wired to CM (common) via jumper or maintained contact.
• Drive powers up, completes initialization, keypad shows ready state (no fault).
• Motor does not rotate; no output frequency, no output current.
• Open DI1, then re-close DI1 to CM and the drive starts immediately.

This behavior differs from many competing low-voltage drives (including the Delta VFD the GS1/GS2 is often used to replace) where a closed input at power-up is interpreted as a valid run command. The GS1/GS2 by default require an edge on the run terminal — a 0→1 transition — after boot to start the motor.

Root Cause: Default Start Logic Requires a DI1 Rising Edge After Boot

The GS1 and GS2 firmware interpret a closed digital input at the moment of DC-bus charge as ambiguous. To prevent unintended starts from wiring errors, contact bounce, or PLC scan timing at power-up, the default control mode treats the run command as edge-sensitive rather than level-sensitive. Until the input transitions open → closed after boot, the drive remains in the "ready but not started" state.

This is the same default behavior that ships in the GS2 series, and the underlying parameter that controls it is consistent between the two product generations. The catch: the relevant parameter is not listed in the published user manual. The drive contains a hidden parameter that exposes the alternate start mode, but documentation shipped with the drive does not document it.

Why This Differs from the Delta VFD It Replaces

The replacement scenario most often seen in the field is a Delta VFD-EL, VFD-B, or VFD-E series being swapped for an AutomationDirect GS1/GS2 in a fixed-speed pump, fan, conveyor, or mixer application. Most Delta VFDs default to "run on power if DI is closed" (level-sensitive run) when parameter 03-01 (or equivalent source-of-run-command) is set to external terminal control. Engineers migrating to the GS1/GS2 expect the same behavior, hit the wall at first power-up, and assume the drive is defective.

It is not defective. The default is simply more conservative on the GS1/GS2 than on the Delta platform. The drive is operating exactly as designed; the design intent just does not match the legacy machine's wiring convention.

Solution: Access and Configure Parameter 06-30

The correction is to navigate the keypad to parameter 06-30 and select the mode that allows a maintained (level-sensitive) run input to start the drive at power-up. Follow the procedure below.

Prerequisites

• GS1 (GS1-xxxxx) or GS2 (GS2-xxxxx) drive, any firmware revision. (See the drive's data-nameplate label — GS1 and GS2 are visually similar; confirm the model before proceeding.)
• Keypad is unlocked. If the drive shows a LOCK indicator, hold the MODE key for several seconds until the lock icon clears.
• Main disconnect is closed; control power is available; drive is in STOP state (motor not running).
• No active fault. If a fault is present, clear it before editing parameters.

Step-by-Step: Setting Parameter 06-30

1. Press the MODE key until the parameter group display reads 06 (group 6 — typically communication/special function on the GS series).
2. Press the ▲ or PROG/DATA key to enter the group; the parameter index advances to 06-00, 06-01, ... up to 06-30.
3. Navigate to 06-30 using the up arrow. The parameter will appear even though it is not in the manual — this confirms the parameter exists in the firmware.
4. Press PROG/DATA (or SET, depending on firmware) to view the current value.
5. Change the value to enable level-sensitive (run-on-power) mode. The default value of 06-30 corresponds to edge-sensitive start; setting the alternate value converts the start logic to level-sensitive so that a closed DI1 at power-up starts the drive.
6. Press PROG/DATA to write the value. The display should blink or return to the parameter index to confirm the write.
7. Press MODE repeatedly to return to the main status display.
8. Cycle control power to the drive (or fully power down and back up) so the new setting takes effect.

Alternative: Edge-Triggered Operation (No Parameter Change)

If the application can tolerate a brief start delay, leave 06-30 at default and wire a normally-open start contact that closes one second after power-up. A small timing relay, a PLC output, or even a delayed-closure contactor works. This is the preferred solution for safety-relevant applications where a level-sensitive start is not acceptable (e.g., E-stop circuits, guard interlock machinery).

Verification

1. With the drive powered down, verify DI1 is hard-wired to CM (jumper or maintained contact).
2. Apply power to the drive. Watch the keypad boot sequence.
3. After the drive reaches the ready state, the motor should accelerate to the programmed frequency using the acceleration ramp in 00-14 (accel time 1) or 00-20 (depending on GS1/GS2 firmware generation).
4. Open DI1 — the drive should decelerate to stop using the decel ramp (00-15 or equivalent).
5. Re-close DI1 — the drive should restart. Repeat steps 3 and 4 a few times to confirm reliable operation.
6. Remove power, wait for the DC bus to discharge (CHARGE LED off), re-apply power, and confirm the drive starts automatically with DI1 still closed.

If the drive does not start on power-up after writing 06-30, double-check the parameter was actually stored (re-read the value). Some firmware revisions require an additional reset of parameter 00-02 (parameter reset / restore defaults) to retain custom values across power cycles.

Parameter Reference Table

Troubleshooting Matrix

Safety Considerations for Level-Sensitive Start

Before enabling 06-30 in level-sensitive mode, evaluate whether the application is appropriate for an automatic start on power-up. Per OSHA 29 CFR 1910.147 and similar machine-safety standards, automatic restart on power restoration is acceptable only when:

• The machine is guarded such that no personnel can be in the hazard zone at the moment of restart, OR
• The drive/machine is part of a process where brief interruption and auto-resume is expected and designed for (e.g., HVAC fans, pumping systems), AND
• E-stop circuits remain active and can override the run command regardless of the 06-30 setting.

For most industrial conveyors, mixers, and machine tools, edge-triggered operation (the factory default) is the safer choice and is what most control circuits assume. Use the 06-30 override only after a documented risk assessment.

Two-Wire vs Three-Wire Control Context

Legacy VFDs commonly support both two-wire (maintained) and three-wire (impulse) control schemes:

• Two-wire (level-sensitive): A maintained contact closure = run; open = stop. The contact must stay closed for the motor to keep running. This is what the Delta VFD the GS1/GS2 is replacing most likely used.
• Three-wire (edge-sensitive): A momentary start pushbutton sets a latch; a separate momentary stop pushbutton clears it. A power cycle clears the latch — the drive will not restart on its own.

The factory GS1/GS2 default is closer to a three-wire control philosophy, with the simplification that a single DI1 transition is used (no separate stop). Setting 06-30 to the alternate value restores classic two-wire behavior.

Comparing GS1, GS2, and Successor GS3/GS4 Behavior

Engineers familiar with the later GS3 and GS4 generations should note that the parameter structure is not identical across generations. Where the GS1/GS2 rely on hidden parameter 06-30, the GS3 exposes the equivalent function through the documented "start mode" parameter in group 05 (control configuration). For the GS4, the parameter is part of the start/stop control group and is fully documented. When porting a working GS1/GS2 configuration to a GS3 or GS4, do not assume parameter numbers transfer directly — consult the appropriate AutomationDirect manual for the target drive.

Field Commissioning Best Practices

1. Document the baseline. Before changing 06-30, record all parameter values via the drive's parameter dump function (if available) or a manual log. This is invaluable if a factory reset is needed later.
2. Test without the motor first. Set 01-01 (frequency source) to keypad, set frequency to 0 Hz, then verify start/stop logic with no rotation. This isolates control wiring from motor and load behavior.
3. Test with the motor uncoupled. Verify rotation direction with the motor mechanically disconnected from the load, then recouple.
4. Verify fault response. With the drive running, trigger an E-stop and confirm the drive stops within the expected decel ramp or via coast-to-stop, depending on the stop mode parameter.
5. Re-test after a full power cycle. Many parameter changes only take effect on the next power-up. Always re-test from a cold start.

Frequently Asked Questions