Commissioning a Yangxiu DZW series multi-turn electric actuator (AC380V three-phase three-wire supply, 4-20mA position output, IP55, -20 to 60 °C ambient, 0.030-15 kW output) runs along two tracks: torque mechanisms are adjusted "closing first, from small to large" until the valve seats tightly, and travel mechanisms are set by closing the valve by hand, disengaging the counter gear, and turning the cam until it trips the micro-switch. On the fault side, phase loss is the most common — with a built-in quick test: if the "power phase loss" alarm appears immediately after a local start command it is a static phase loss; if it appears 1-2 seconds later it is a dynamic phase loss, and the causes and remedies of the two differ completely. This article compiles the DZW commissioning steps and 11 common faults with causes and fixes.
| Item | Specification |
|---|---|
| Power supply | AC380V, 50Hz, three-phase three-wire |
| Position signal | 4-20mA output |
| Ingress protection | IP55 |
| Ambient temperature | -20 to 60 °C |
| Output power | 0.030-15 kW |
After every power-up the actuator is in REMOTE. Press the LOCAL key to switch: the green remote LED goes out, the red local LED lights, and the remote OPEN/STOP/CLOSE keys become inoperative — only the local panel keys work. Before commissioning: verify reliable earthing, and on a newly installed actuator check motor phase sequence and control wiring before the first electric stroke to prevent runaway.
Quick test: in LOCAL, turn the (black) control knob toward open or close — if the "power phase loss" alarm appears immediately, it is static phase loss; if it appears 1-2 seconds later, it is dynamic phase loss.
| Type | Probable cause | Remedy |
|---|---|---|
| Static (alarms immediately) | One phase of the three-phase supply missing | Measure voltage at the supply terminals with a tester/multimeter; if abnormal, check the user's distribution system and line |
| Control-board signal connector unreliable | Re-seat or replace the signal cable | |
| Power-board component damaged | Replace power board with same model | |
| Dynamic (alarms after 1-2s) | Control-board signal connector unreliable | Re-seat or replace the signal cable |
| AC contactor damaged | Replace contactor with same model | |
| Motor damaged | Replace motor with same model | |
| Power-board component damaged | Replace power board with same model |
The logic is intuitive: a static phase loss exists before starting, so it alarms at once; a dynamic phase loss appears only after the contactor pulls in and the motor is energized, so the alarm lags 1-2 seconds — hence the focus shifts to the contactor and motor.
| Symptom | Probable cause | Remedy |
|---|---|---|
| Motor races (no output) | Manual/electric changeover locked, motor spinning free | Reset with the setter; turn the handwheel, then run electrically so it engages and runs continuously; repeat if needed, otherwise contact the factory |
| Motor contactor damaged or main-board plug loose | Replace the contactor or re-seat the main-board plug | |
| Power loss | User's supply fuse blown | Check and fix the distribution system |
| Surge-proof fuse on power board blown | Replace with same model | |
| Power transformer damaged | Replace with same model | |
| Signal connector unreliable | Re-seat or replace the cable | |
| Motor overheated | Prolonged continuous running exceeded 130 °C; thermostat opened for protection | Pause operation, resume after the motor cools |
| Closing over-torque | Closing over-torque protection set too low | Increase the closing torque value with the setter; run 2-3 full strokes locally without the alarm |
| Actuator sizing mismatched to site conditions | Replace with a correctly sized model | |
| External obstruction (e.g. jammed valve) | Remove the external obstruction | |
| Opening over-torque | Same class as closing over-torque | Same remedies as above |
| Position over-range / under-range | Position settings lost | Reset with the setter and re-set the upper/lower limits |
| Remote digital control inoperative | Mode knob not correctly at REMOTE | Align the "REMOTE" marking with the pointed index beside the knob |
| Knob board component damaged | Replace the knob board | |
| Remote control wiring incorrect or unreliable | Check wiring, ensure correct and tight | |
| Abnormal display at power-on | Abnormal power-on reset | a. Reset with the setter; b. Disconnect power, remove the backup battery, wait 15-20 minutes, re-power (repeat a few times), refit the battery once normal; c. Replace main board with same model |
| Oil plug leaking | Oil-plug screw loose | Tighten the plug and wipe off the oil |
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