Danfoss ICAD Actuator 027H9075

⚠️Important Note: Part number 027H9075 corresponds to ICAD 600A (NOT ICAD 1200A).

ICAD 1200A part-number: 027H9077, rated current 2.0 A.

027H9075: ICAD 600A, 24 VDC, rated 1.2 A, compatible with ICM20-32

027H9077: ICAD 1200A, 24 VDC, rated 2.0 A, compatible with ICM40-150

1. モデルコードの内訳

ICAD = Stepper-motor actuator for ICM motor-operated valves; Version A: built-in encoder + local LCD MMI keypad.

2. コアの電気パラメータ (ICAD-1200A 027H9077, 24 V 2.0 A)

3. 動作原理

The ICAD uses a high-speed stepper motor with magnetic-coupling gear-free transmission to drive the ICM motor-operated valve. A built-in position encoder provides closed-loop valve-position feedback.

サポートされている機能:

1. Continuous modulating via 4-20 mA / 2-10 V analogue signal.
2. Digital dry-contact full-open / full-closed switching.
3. Local LCD keypad for parameter setup, position indication and fault-code reading.

Magnetic-coupling design: No rigid mechanical connection between actuator and valve body; eliminates refrigerant-leakage risk.

4. ピンの割り当て: M12-8-pin Signal Connector

4-pin M12 power connector: Main 24 VDC supply; optional connection for fail-safe UPS power.

5. Compatible Valve List

ICAD 600A (027H9075): ICM-20, ICM-25, ICM-32

ICAD 1200A (027H9077): ICM-40, 50, 65, 80, 100, 125, 150; also suitable for CVE pilot valves.

6. 典型的なアプリケーションシナリオ

産業用冷凍装置, ammonia refrigeration, CO₂ transcritical refrigeration units

Liquid-line electronic expansion regulation

Suction-pressure / 温度調節

Hot-gas bypass & hot-gas defrost control

Large cold-storage plants, refrigeration compressor stations, food-processing freezing lines

Selection Pitfalls & リスク警告

7. Do not mix-up part-numbers: 027H9075 = 600A (1.2 あ); 027H9077 = 1200A (2.0 あ). Mechanical mounting interfaces are identical, but output torque differs drastically. Never drive large-size valves with ICAD-600A; this triggers A1 valve-mismatch alarm.
8. Use isolated 24 VDC power supply only; 24 VAC is strictly forbidden. Calculate cable voltage drop; terminal voltage must not drop below 21 Vdc.
9. Outputs are NPN transistors; external power supply is mandatory. Do NOT connect relay coils directly to actuator outputs.
10. 動作範囲: -30 ℃ ~ +50 ℃. IP67 rating provides dustand splash-proof protection; permanent submersion is prohibited.
11. Parameter i26 must be set to match the actual ICM valve type, otherwise alarm A1 will activate.
12. Summary of Fault Codes

9. 交換情報

ICAD600A / 1200A are mature active-range products, not obsolete. Legacy ICAD600 / 900 / 1200 can be directly replaced by A-series units; mechanical interfaces are fully compatible. Simply re-configure valve-type parameter i26 after swap-out.

Domestic alternative note: No drop-in magnetically-coupled replacement actuator available. Full valve-body + actuator assembly replacement is required for third-party retrofits.

Commissioning Procedure for ダンフォス ICAD 1200A (027H9077)

適用機種: ICAD-600A / ICAD-1200A (A-series with LCD panel); 24 VDC supply; for ICM motor-operated valves.

⚠️027H9075 is ICAD-600A with reduced torque. Do NOT use it for ICM40 or larger valves.

Prerequisites: Valve mechanically fitted, magnetic-coupling correctly engaged, piping pressure-test completed. All wiring performed with power removed; M12 connectors fully tightened.

1. Pre-power-on Wiring Check (必須)
2. Confirm isolated 24 VDC power supply; 24 VAC forbidden. Power-supply rating ≥ 2.5 A.
3. Secure M12-4-pin power and M12-8-pin signal connectors. Cables undamaged; cable shield single-ended earthed.
4. NPN output circuit: External 24 V must be supplied from PLC side. Never connect relay coils directly to actuator outputs.
5. Analogue-signal circuit: Total loop impedance for 4-20 mA input ≤ 200 Ω. 2-10 V input impedance ≥ 10 kΩ.
6. Verify valve stem free from mechanical obstruction. Magnetic-coupling ring correctly fitted, no disengagement.
7. パワーアップ & Initial Self-test
8. Apply 24 VDC supply; LCD illuminates and actuator performs automatic self-test.
9. If alarm codes appear after self-test: record alarm code first, do not reset immediately.
10. ⚠️First-time power-on: No valve selected, alarm A1 is normal expected behaviour.
11. Basic Parameter Setup via LCD Keypad
12. Enter menu: Press and hold OK key for 3 seconds.
13. Locate parameter i26 Valve type

ICAD-1200A (ICM40-150): Select actual valve size (ICM-40 /50 /65 /80 /100 /125 /150).

ICAD-600A (027H9075): Only ICM-20-25-32 permitted.

3. Save setting. Actuator executes full-stroke auto-calibration.

Behaviour: Actuator travels automatically to full-closed position, then full-open. Do not cut power or apply external force during calibration.

4. When calibration completes, alarm A1 clears. If A1 persists: double-check i26 setting; inspect magnetic-coupling for slipping.

Frequently-used Parameter Table

4. Functional Tests

4.1 Local Manual Mode Test

1. Set i03 = `0 Local manual`.
2. Use up/down keys to adjust valve position from 0 %-100 %.
3. Compare LCD indicated position with actual valve movement.

No valve movement: Check magnetic-coupling, 機械的な妨害, i26 misconfiguration.

4. Drive valve to 0 % (full-closed) and 100 % (full-open); confirm mechanical end-stops are reached.

4.2 External Analogue-signal Control Test (PLC / DCS)

1. Set i03 to `1 (4-20 ミリアンペア)` or `2 (2-10 V)` as appropriate.
2. Send minimum signal (4 mA / 2 V) from PLC; confirm valve moves to 0 % full-closed.
3. Send maximum signal (20 mA / 10 V); confirm valve moves to 100 % full-open.
4. Send intermediate 50 % reference; verify position tracking. Read analogue feedback output for cross-validation.

4.3 Digital-output Verification (NPN outputs)

Monitor three NPN outputs via PLC:

Full-open output: Conducts at 100 % valve position.

Full-closed output: Conducts at 0 % valve position.

Alarm output: Conducts when actuator fault is active.

NPN logic: Conducted = pin short-circuited to GND; non-conducted = high-impedance state.

5. Alarm Acknowledgement
6. Transient alarms: Navigate to `Acknowledge alarm` menu item, press OK to confirm.
7. Persistent alarms: Alarm recurs immediately after reset. Resolve root-cause fault before acknowledgement; avoid repeated blind resetting.
8. Post-commissioning Final Steps
9. Restore i03 to the control-source required by the plant-control system.
10. Exit parameter menu to return to main position-display screen.
11. Retighten M12 connectors; implement cable-strain-relief protection.
12. Document commissioning data: i26 valve setting, i40 fail-safe mode for project records.
13. On-site Troubleshooting Summary

8. Commissioning Hard-Rules (Forbidden Operations)
9. ❌ Hot-plug M12 connectors: Risk of IO-board electrostatic burnout.
10. ❌ Operate actuator without configuring i26 valve-type: Magnetic-coupling damage risk.
11. ❌ Use ICAD-600A (027H9075) for ICM40-and-larger valves: Insufficient torque causes recurring A2 and magnetic-coupling destruction.
12. ❌ Power-loss during auto-calibration: Loss of stroke-calibration data.
13. ❌ 24 VAC power supply: Permanent actuator power-supply-circuit destruction.

一般的な障害 & Troubleshooting for Danfoss ICAD-600A / ICAD-1200A (A-series LCD-type)

Applicable part-numbers: 027H9075 ICAD600A, 027H9077 ICAD1200A; 24 VDC supply, for ICM modulating valves.

Split into LCD-displayed alarm codes and non-alarming functional anomalies.

1. Panel Alarm Codes (LCD Axx display)

2. Functional Abnormalities Without Active Alarms

Fault 1: Local manual works; external PLC reference has zero response

-症状: Valve responds 0-100 % from keypad; no reaction to 4-20 mA / 2-10 V remote signal, 警報なし.

-Root-causes:

1. `i03 Control signal` set to 0 (local manual), remote reference blocked.
2. Signal-type parameter mismatch (hardware 4-20 mA but i03 set for 2-10 V).
3. Missing common-GND between signal source and actuator; floating signal.
4. Broken signal cable, faulty PLC analogue channel.

-是正措置:

1. Set i03 to correct source: 1 = 4-20 mA; 2 = 2-10 V.
2. Connect signal negative to actuator signal-GND (pin 6).
3. Measure signal directly at actuator-side terminals with multimeter to isolate PLC-side versus actuator-side faults.

Fault 2: Reversed valve-position tracking; 4 mA = full-open, 20 mA = full-closed

-Root-cause: Reversed signal-span configuration.

-是正措置: Swap numerical values of i04 minimum-signal and i05 maximum-signal; alternatively invert output scaling inside PLC program.

Fault 3: Chattering / hunting; valve moves intermittently, position oscillates

-Root-causes:

1. High internal valve-spool friction, fouling / scaling.
2. Voltage sag under load from undersized power-supply / 配線.
3. Electrical-noise interference; unshielded cables routed alongside power cables.

-是正措置:

1. Evaluate valve-body service; perform overhaul if fouled.
2. Maintain terminal voltage ≥ 21 VDC under load; upgrade power-cable cross-section.
3. Use shielded cable with single-end shield-earthing; separate signal wiring from power-cable routes.

Fault 4: No feedback from NPN digital outputs (full-open / full-closed / アラーム)

-症状: LCD indicates full-open status but PLC receives no feedback signal.

-動作原理: ICAD NPN open-collector outputs draw no voltage themselves; they only provide a switch-to-GND path.

-Root-causes:

1. No external 24 V supply fed into PLC DI-input circuit.
2. Mis-wiring; relay coil connected directly to output terminal.
3. Incorrect output-threshold parameter settings.

-是正措置:

1. Supply external 24 V to PLC DI-channel; output pin pulls low to GND when active.
2. Never drive relay coils directly; install intermediate relay.

Fault 5: No LCD illumination; actuator completely dead on power-up

-Root-causes:

1. Zero 24 VDC supply; reversed power-supply polarity.
2. Crimp-failure / bent pins inside M12 power connector.
3. Surge-damage to internal power-supply circuit.

-是正措置:

1. Measure voltage and polarity at M12 power-connector terminals.
2. Inspect connector pins for retraction / ダメージ.
3. Correct supply voltage present yet no display: internal hardware failure, replace actuator.
4. Frequent Human-induced Field Faults (選択 / インストール / Commissioning-related)
5. ICAD-600A (027H9075) driving ICM40-or-larger valves

Insufficient torque triggers repeated A2 travel-fault alarms and rapid magnetic-coupling wear. Must upgrade to ICAD-1200A (027H9077).

2. Running unit without i26 valve-type configuration and auto-calibration

Incorrect stroke-data leads to incomplete valve-closure / incomplete opening; magnetic-coupling damage risk.

3. Hot-swapping M12 circular connectors

ESD-stress may destroy IO-board electronics, triggering A5 internal-fault alarm.

4. 24 VAC mains supply applied

Permanent destruction of actuator power-supply circuit, total unit loss.

5. Power-interruption during auto-calibration

Calibration-stroke data lost; persistent A2 alarms; full recalibration required.

4. Standardised General Troubleshooting Workflow
5. Record LCD alarm-code; document operating conditions (温度, 中くらい, valve-position).
6. 電源オフ; inspect mechanical assembly: actuator mounting, magnetic-coupling, valve-spool jamming.
7. Power-on; measure M12-terminal supply-voltage under load; confirm 21-26.4 VDC.
8. Cross-check key parameters: i26 valve-type, i03 control-source, i40 fail-safe setting.
9. Execute complete automatic valve-stroke calibration.
10. Isolate fault-location by testing local manual mode:

✅ Local manual works: Fault lies in PLC, cabling or external control-system.

❌ Fault persists in local manual: Defect in actuator hardware, valve-body mechanics or magnetic-coupling.

Spare-part note: Magnetic-coupling ring is a consumable component and can be ordered separately; full-actuator replacement is not always required.