What does Control Techniques M700 fault code Err 3 mean?

CT M700 Err 3 is an Overcurrent trip. The drive output current has exceeded the peak current limit. Common causes: output short circuit, motor winding fault, too-rapid acceleration ramp, undersized drive for the motor/load, or motor cable too long without output reactor. Remediation: check motor wiring for shorts, increase acceleration ramp time, verify drive frame size matches motor FLA, add output reactor if cable length exceeds 50m.

What does Control Techniques M700 fault code Err 7 mean?

CT M700 Err 7 is an Overvoltage trip. The DC bus voltage has exceeded the maximum limit. Common causes: regenerative load braking without a braking resistor or active front end, supply voltage too high, deceleration ramp too fast for load inertia. Remediation: install or check braking resistor/chopper, increase deceleration ramp time, verify supply voltage is within specification (400V drive: 380–480V ±10%).

VFDs / Control Techniques M700

Product Detail — Control Techniques

Control Techniques M700
Variable Frequency Drive

Q: What is the Control Techniques M700 model number structure?

The CT M700 model number format is M700-[Series]-[Voltage][Current][Revision]. Example: M700-03400150A. '03' = Frame size 3; '400' = 400V supply; '150' = 15.0A output current; 'A' = first revision. To select a model: identify supply voltage (200V or 400V or 690V), calculate required output current from motor nameplate FLA × 1.1 safety factor, then select the next standard CT M700 frame with equal or higher current rating.

Widely used in 4-way shuttle drive systems and cold storage (-18°C) automated warehouse lifters and conveyor drives.

The M700 is Control Techniques' premium high-performance VFD, engineered for demanding warehouse automation applications requiring precise speed and position control, integrated functional safety, and industrial fieldbus connectivity.

0.25 – 2,800 kW 200V / 400V / 690V STO · SS1 · SS2 · SLS (PL-e) Profinet · EtherNet/IP · EtherCAT

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Technical Specifications

Parameter	Specification
Drive series	M700 (High Performance)
Power range	0.25 kW – 2,800 kW
Supply voltage	200–240V 1ph/3ph · 380–480V 3ph · 500–690V 3ph
Output frequency	0 – 1,500 Hz
Control modes	Open-loop V/Hz · Closed-loop RFC-A (sensorless) · RFC-S (encoder)
Speed regulation (RFC-A)	±0.01% of rated speed
Torque regulation	±2% of rated torque
Dynamic response	Current loop: <75µs (high performance mode)
Ambient temperature	-10°C to +50°C (derate above 40°C)
IP rating	IP20 standard · IP55 available (certain frames)
Functional safety	STO, SBC, SS1, SS2, SLS, SSM (PL-e / SIL 3)
Safety standard	IEC 62061 SIL 3 · ISO 13849-1 PL-e
Fieldbus — standard	Modbus RTU/TCP
Fieldbus — option slots	Profinet · EtherNet/IP · EtherCAT · Profibus-DP · CANopen
Onboard PLC	IEC 61131-3 function blocks (Ladder, ST, FBD)
Encoder interface	AB incremental · SSI · SinCos · EnDat · Resolver
Braking	Internal chopper ≤90kW · External chopper >90kW
Certifications	CE · UL · cUL · RoHS

M700 Model Numbers — 400V Range (Common Warehouse Sizes)

Model Number	Output Current	Motor Power (kW)	Frame	Application
M700-03400045A	4.5 A	1.5 kW	Frame 2	Small conveyor motor
M700-03400095A	9.5 A	4 kW	Frame 3	Shuttle travel axis (small)
M700-03400140A	14.0 A	7.5 kW	Frame 3	Shuttle travel / conveyor
M700-03400150A	15.0 A	7.5 kW	Frame 3	Shuttle travel axis (standard)
M700-03400220A	22.0 A	11 kW	Frame 4	Shuttle hoist / pallet conveyor
M700-03400370A	37.0 A	18.5 kW	Frame 5	Stack crane travel axis
M700-03400550A	55.0 A	30 kW	Frame 5	Stack crane hoist
M700-03400750A	75.0 A	37 kW	Frame 6	Heavy crane / large pallet shuttle
M700-03401100A	110 A	55 kW	Frame 7	High-bay crane hoist (heavy duty)
M700-03401500A	150 A	75 kW	Frame 7	Very heavy crane / EMS drive

200V and 690V models available — contact us for full model list. All models in stock or available with 4–8 week lead time.

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CT M700 Datasheet

Download the official Control Techniques M700 technical datasheet — specifications, wiring diagrams, and parameter list.

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Troubleshooting Reference

Control Techniques M700 Fault Codes (Common)

Most frequent M700 trip codes in shuttle and AS/RS applications, with causes and remediation steps. For complete fault code list, download the datasheet above.

Code	Fault Name	Common Causes (Warehouse Context)	Remediation
Err 3	Overcurrent	Output short circuit, undersized drive, too-rapid accel ramp, motor winding fault	Check motor wiring, increase accel time, verify drive current rating ≥ motor FLA × 1.1
Err 7	Overvoltage	Regenerative load without braking resistor, too-fast decel ramp, high supply voltage	Check/install braking resistor, increase decel ramp time, check supply voltage
Err 4	Output Phase Loss	Motor cable break, connector loose, contactor failure between drive and motor	Check output cable continuity, inspect connector pins, check output contactor
Err 15	Supply Phase Loss	Input phase missing, loose input fuse or terminal, blown input fuse	Check input power supply, inspect input fuses and terminal connections
Err 23	Motor Temperature (PTC)	Motor overtemperature, PTC thermistor wiring fault, shuttle running blocked	Allow motor to cool, check PTC wiring, inspect for mechanical jam on shuttle axis
Err 27	Drive Temperature	Ambient too high, blocked ventilation, cooling fan failed, cold-chain panel heater stuck on	Check ambient temp, clean heat sink, verify cooling fan, check panel thermal management
Err 46	STO Input	STO (Safe Torque Off) input opened — emergency stop activated, safety relay operated	Check safety relay circuit, E-stop button status, STO wiring. Clear safety fault to reset.
Err 1	Brake Resistor Overload	Excessive regenerative energy — too-fast deceleration, heavy overhung load	Increase decel time, use larger braking resistor, check braking duty cycle
Err 12	Fieldbus Timeout	Profinet/EtherNet/IP communication lost — cable fault, switch failure, WCS timeout	Check fieldbus cable, network switch status, WCS communication timeout settings
Err 29	Encoder Loss	Encoder cable broken/disconnected, encoder failure, incorrect encoder supply voltage	Inspect encoder cable and connector, verify encoder supply voltage (5V or 24V per encoder type)

Cross-Reference

CT M700 — Competitor Cross-Reference

Direct performance-tier equivalents from ABB, Siemens, and Lenze. Note: cross-reference is approximate — always verify specifications for your specific application before substitution.

CT M700 Model	CT M700 (kW / A)	ABB Equivalent	Siemens Equivalent	Lenze Equivalent
M700-03400095A	4 kW / 9.5A	ACS880-01-010A-3	6SL3225-0BE21-1AA0 (G120)	E84AVSCE1104SX0
M700-03400150A	7.5 kW / 15.0A	ACS880-01-016A-3	6SL3225-0BE21-5UA0 (G120)	E84AVSCE1504SX0
M700-03400220A	11 kW / 22.0A	ACS880-01-025A-3	6SL3225-0BE22-2AA0 (G120)	E84AVSCE2204SX0
M700-03400370A	18.5 kW / 37.0A	ACS880-01-038A-3	6SL3225-0BE23-8AA0 (G120)	E84AVSCE3704SX0
M700-03400550A	30 kW / 55.0A	ACS880-01-062A-3	6SL3225-0BE25-5AA0 (G120)	E84AVSCE5504SX0

Need a specific cross-reference not listed? Submit an RFQ or WhatsApp us with your current drive model.

FAQ

CT M700 — Frequently Asked Questions

What does CT M700 fault code Err 3 (Overcurrent) mean? +

CT M700 Err 3 is an Overcurrent trip — the drive output current has exceeded the peak current limit. Common causes in warehouse automation: output short circuit in motor cable or terminal box, undersized drive for the motor FLA, too-rapid acceleration ramp time causing excessive inrush current, motor winding fault (inter-turn short), or motor cable longer than 50m without an output reactor. Fix: check motor wiring for shorts, increase acceleration ramp time, verify drive rated current ≥ motor FLA × 1.1, add output reactor for long cables.

What does CT M700 fault code Err 7 (Overvoltage) mean? +

CT M700 Err 7 is an Overvoltage trip — the DC bus voltage has exceeded the safe limit. Caused by: regenerative load (motor acting as generator during deceleration) without a braking resistor or active front end, deceleration ramp too fast for the load inertia, or supply voltage too high. Fix: install or check the braking resistor/chopper unit, increase deceleration ramp time in Pr 02.011, verify supply voltage is within specification (380–480V ±10% for 400V frame drives).

What does CT M700 fault code Err 46 (STO Input) mean? +

Err 46 indicates the STO (Safe Torque Off) input has been activated — the drive has removed power to the motor as a safety response. In shuttle ASRS systems, this is typically triggered by: an E-stop button press, safety light curtain activation, safety relay de-energization, or STO wiring fault. The drive cannot restart until the STO circuit is re-energized (safety relay closed) and the fault is reset. Check E-stop buttons, door interlocks, safety relay status, and STO input wiring at drive terminals STO1 and STO2.

What is the Control Techniques M700 model number structure? +

CT M700 model format: M700-[Series]-[Voltage][Current][Revision]. Example: M700-03400150A. '03' = drive series identifier; '400' = 400V supply; '150' = 15.0A rated output current; 'A' = design revision. To select the right model: (1) identify supply voltage (200V / 400V / 690V); (2) read motor nameplate FLA; (3) multiply FLA × 1.1 safety factor; (4) select M700 model with rated current ≥ your calculated value. For shuttle applications requiring overload capability, also check the 150% overload rating duration.

Can the CT M700 be used in a -25°C cold storage warehouse? +

Yes, with proper panel engineering. The CT M700 itself is rated for -10°C to +50°C ambient. For cold room installation at -18°C to -25°C, the drive must be mounted inside an IP55 or IP65 electrical enclosure with a thermostatically controlled anti-condensation heater that maintains the enclosure internal temperature above 0°C. Cold-rated cables rated to -40°C must be used for motor and control wiring. The drive firmware should be configured for cold-start conditions. Econocontrol can supply complete cold-rated drive panel packages configured for your cold chain ASRS application.

What is the lead time for CT M700 from Econocontrol? +

Common CT M700 models (Frame 3–5, 400V) are typically available from stock or with 2–4 week lead time. Larger frames (Frame 6+) and 690V variants may require 6–10 weeks. We serve CIS countries (Kazakhstan, Uzbekistan, Russia, Azerbaijan), Middle East (UAE, Saudi Arabia, Qatar), Southeast Asia (Vietnam, Indonesia, Thailand), and Australia via CIF or DDP delivery. Contact us with your model number and delivery country for a specific availability and lead time confirmation.

Control Techniques M700 Variable Frequency Drive