Danfoss MCD202-015-T4-CV1 Soft Starter

(Material nr.: 175G5221)

VLT® Compact Starter MCD202 Compact Soft Starter

Short model code: MCD202015T4CV1

✅ Explicația codului modelului

MCD202: MCD202 series, pornirea limitei curentului + built-in motor protection (different from MCD201; MCD201 only has voltage ramp, no built-in motor overload protection)

015: Evaluat 15 kW

T: Trifazat

4: Main circuit voltage 200–440 VAC

CV1: Alimentare de control 24 V AC/DC

Frame A, Montabil pe șină DIN (specifications ≤30 kW support DIN rail mounting)

✅ Core Electrical Specifications

Puterea motorului adecvată: 15 kW

Curent nominal: 34 O

Main supply: 3×200～440 VAC (-15% / +10%), 45–66 Hz

Alimentare de control: 24 V AC/DC

Start mode: Pornire limitată de curent + TVR timed voltage ramp soft stop

Bypass încorporat: Da; bypasses SCR after start completion to reduce heat loss

Funcții de protecție: Suprasarcina motorului (default Class 10), over-temperature, phase sequence loss, pierdere de fază, SCR fault, motor PTC thermistor input

Starting capability: Standard 4×Ie for 6 s; heavy-duty mode 4×Ie for 20 s

Control method: 2-sârmă / 3-wire start-stop, ieșire releu

Greutate netă: 2.4 kg; gross weight: 2.9 kg

Temperatura ambiantă de funcționare: Până la 50 °C without derating

✅ Typical Applications

Pompe de apă, fani, transportoare, compresoare. Ideal for scenarios requiring current-limited starting to reduce grid inrush, without needing an external thermal relay.

✅ Cross-series Comparison & Note de înlocuire

1. MCD202-015-T4-CV3: Control supply 110–440 VAC (CV3 version, cele mai frecvente). Not CV1; control circuits cannot be directly interchanged.
2. MCD201-015-T4-CV1: Same power and voltage rating, but MCD201 has no built-in motor protection and fewer functions.
3. Successor replacement: The MCD200 series is end-of-life. New projects are recommended to use the MCD600 series equivalent.

✅ Fault Quick Reference (Common for MCD202)

Err 1: Supratemperatură

Err 2: Suprasarcina motorului

Err 4: Pierdere de fază / current unbalance

Err 5: Start timeout

Err 6: SCR fault

Err 10: PTC motor overheat

✅ Start and stop times are adjustable. The MCD202 uses rotary dip-knob adjustment (no menu display panel).

Nota: The MCD201 does not support soft stop. Only the MCD202 features TVR voltage-type soft stop.

Parameter Ranges (Manual MG17C241)

1. Start ramp-up time (Ramp Up): 2～20 s, implicit din fabrică 10 s

Operating logic: Current limiting is primary, voltage ramp is secondary; current ramp can also be enabled (2/5/15 s preset gears)

2. Soft stop time (Soft Stop / Ramp Down): 2～20 s by gear selection; can also be set to soft stop disabled for direct power-off shutdown (implicit din fabrică: soft stop disabled)

Metoda de ajustare

Four adjustment knobs on the front face:

Buton 1: Curentul nominal al motorului

Buton 2: Starting current limit

Buton 3: Start ramp-up time (Ramp Up)

Buton 4: Soft stop ramp-down time (Soft Stop)

Brief Application Guidance (Most common for pump applications)

Fani: 5–10 s start time; soft stop is usually not required

Centrifugal pumps for water hammer suppression: Enable soft stop, set 8–15 s soft stop time

Soft stop principle: TVR timed voltage ramp-down. It is not variable-frequency deceleration and cannot provide precise constant-speed slowdown; it is only used to suppress water hammer and light-load buffering.

Limitation Reminders

This compact soft starter uses stepped gear adjustment instead of continuous stepless fine-tuning.

Soft stop only activates after a stop command. Once full-speed bypass is closed, the SCRs are bypassed and no longer regulate voltage.

The start timeout protection must be set in coordination; its value must be longer than the actual start time, otherwise Err5 start timeout will trigger.

MCD202-015-T4-CV1 Start / Stop Time Adjustment Precautions

Core premise: This unit uses TVR timed voltage ramp start/soft stop + bypass încorporat. It is not a VFD. SCRs only work during the start ramp and soft stop ramp. After bypass pull-in at full speed, thyristors are out of circuit.

1. Start Ramp-Up Time (Ramp Up)
2. Adjust the current limit knob together with ramp time; do not only adjust the time setting.

The MCD202 operates in current-limit priority mode. Even if ramp time is set to 20 s, a low current limit may prevent the motor from accelerating and trigger Err5 (start timeout). The ramp only defines the voltage change profile; the current ceiling is locked by the current limit knob.

Field tip: Set current limit first to guarantee rotation, then configure ramp time. For heavy-duty conveyors and compressors, raise current limit before extending start time.

2. Start timeout protection (Err5) must be longer than the actual acceleration time.

Start timeout range: 2～20 s. Timeout setting actual time to reach full speed, leave a margin of 2–5 s. O 15 s ramp paired with a 10 s timeout will almost certainly trip.

3. Gear-based adjustment, not continuous stepless regulation

Knob settings are discrete preset steps, not smooth fine adjustment. Fixed range: 2～20 s, implicit din fabrică 10 s.

4. Longer start times extend SCR heating; restrict starts per hour.

Long ramp times combined with high current limits increase thyristor heat generation. For frequent start-stop applications, avoid setting maximum 20 s ramp, otherwise Err1 over-temperature occurs easily. The built-in bypass reduces temperature at full speed, but the SCRs bear load and heat during acceleration.

5. Differentiate between loaded and light-duty starting

Light-duty fans / centrifugal pumps: 5–10 s is sufficient. Excessively long ramps may cause low-speed stall and sustained high current.

Transportoare cu bandă, alimentatoare cu șurub, pompe grele: Ramp can be extended moderately, paired with higher current limit.

2. Soft Stop Time (Ramp Down, MCD202 exclusive; unavailable on MCD201)
3. Soft stop ≠ VFD deceleration; it only reduces voltage gradually.

Constant-speed deceleration cannot be achieved. Torque drops with voltage reduction, and the motor slows by load inertia. For high-inertia fans, even 20 s soft stop may still result in fast coasting; do not expect precise speed control.

2. Factory default = soft stop disabled. When disabled, the bypass opens and the motor coasts freely.

Soft stop is only enabled for pumps requiring water hammer protection. Soft stop is unnecessary for most fan applications.

Critical point: The bypass contact only opens after soft stop completes and voltage falls to a low level. SCRs remain active and generate heat throughout the soft stop sequence.

3. Do not use long soft-stop times for low-inertia loads

Transportoare mici, valve actuators and similar low-inertia loads will draw sustained low-voltage high current under long soft-stop settings, leading to motor overload Err2 or soft starter overheat Err1.

4. Emergency stop overrides soft stop logic

External emergency stop cuts the circuit directly and skips the soft stop ramp. Soft stop only responds to normal stop commands.

3. Capcană comună: Bypass Operation Logic

Start sequence: Start command → SCR voltage ramp → full voltage reached → built-in bypass relay closes, SCRs exit operation. The configured start time only applies before bypass closure.

Stop sequence: Stop command → bypass contact opens first, switching back to SCR control before soft stop ramp begins. If bypass contacts are welded or poorly contacting, soft stop fails immediately and faults occur.

Simptom: Soft stop configured but motor cuts off instantly when stopping. Prioritize inspecting the bypass contactor.

4. Sincronizare & Start-Stop Interval

A fixed 2 s interlock delay is built between successive starts to dissipate motor back EMF. Do not program extremely short start-stop pulses in PLC, repeated rapid cycling will trigger main-circuit faults.

Do not send a new start command while the motor is still coasting down. The MCD202 does not support flying start and will see severe inrush current.

5. Coordination with Motor Protection (CV1 variant has built-in motor protection)

Protectie la suprasarcina motorului (Clasă 10) accumulates thermal capacity based on operating current:

Long start ramps with sustained low-speed high current build thermal load and may trip Err2 overload during acceleration.

The motor rated current knob must match the motor nameplate rating, otherwise all protection thresholds are invalid.

6. Control Supply Variant Note (Your unit CV1: 24 V AC/DC)

Start-stop logic is unaffected by the CV1 supply. Cu toate acestea: Loss of the 24 V control supply disables soft stop, and the motor shuts down directly without ramp.

7. Recommended Field Commissioning Sequence
8. Set motor rated current to match the motor nameplate
9. Set current limit to guarantee successful loaded start
10. Configure start ramp-up time
11. Set start timeout = ramp time + safety margin
12. Enable soft stop only for water hammer control; set to soft-stop off for other loads
13. Test start-stop under no load, observe indicator timing and monitor for Err1/Err2/Err4/Err5
14. Fault Mapping

Err5 Start timeout: Current limit too low OR ramp too long OR timeout threshold set too small

Err1 Over-temperature: Ciclism frecvent, excessively long start/stop ramps, continuous SCR heating

Err2 Motor overload: Long duration of low-speed high current causing thermal accumulation

Danfoss Soft Starter Full Model List & Material Order Codes (Mainstream 400V for China market, T4 = 200–440 VAC)

Model coding rules for MCD201 / MCD202

CV1: 24 V AC/DC control supply (Your MCD202-015-T4-CV1 is CV1)

CV3: 110–240 VAC / 380–440 VAC control supply (most widely ordered)

T4 = 200–440 V; T6 = 200–575 V

MCD201: Voltage ramp start only, no built-in motor overload protection, no soft stop

MCD202: Pornire limitată de curent + TVR soft stop + complete motor protection (series you are using)

Stare: MCD200 (MCD201/MCD202) is phased out. New projects select MCD600.

1. MCD202 (With protection + oprire moale, including your model)

7.5~30 kW: Montabil pe șină DIN; 37 kW and above: base mount only

2. MCD201 (Varianta economica, no built-in motor protection, no soft stop)

3. MCD100 (Micro economy range, 1.5~11 kW, no built-in bypass)

For small fans and pumps, dimensiune compactă, no internal bypass

MCD100-001 (1.5 kW / 3 O) 175G4001

MCD100-007 (7.5 kW / 15 O) 175G4005

MCD100-011 (11 kW / 25 O) 175G4009

4. MCD600 (New generation flagship, direct replacement for MCD202, graphical menu, funcții îmbunătățite)

Sample code: MCD600-xxxB-T4-S1X00CV2; material codes start with 132H. Supports flying start, pump cleaning logic, extended protection and communication options. Power range 7.5~1400 kW

Equivalent replacement for your MCD202-015-T4-CV1 (15 kW /34 O): MCD600-0034B-T4-S1X00CV1 (CV1 = 24 Alimentare control V)

5. Common MCD200 Series Spare Part Order Codes

MCD200 remote operator panel: 175G9004

Modul de comunicare Profibus: 175G9040

Modbus RTU module: 175G9041

EtherNet/IP module: 175G9043

Observații suplimentare

1. T6 versions (200–575 V) follow the same naming rule; replace T4 with T6, with separate material numbers.
2. CV1 and CV3 control supplies are not interchangeable, a frequent site mistake.
3. MCD202 includes built-in bypass; MCD600 can be ordered with or without bypass.
4. End-of-life notice: MCD201/MCD202 are stock-only. New projects specify MCD600.