Danfoss MCI 25B Data sheet

Data sheet

CI-tronic™ Soft Start Motor Controller

Type MCI 25B with Brake

MCI 25B motor controller with brake is designed for soft starting and braking of 3 phase AC motors.

The digital controlled soft starter features accurate settings and several monitoring functions. Acceleration time and initial torque are along with the braking torque easily adjusted. During braking the MCI 25B will apply a DC current to all the windings of the motor,

thus providing a powerful brake function. The automatic stop detection ensures a safe operation. For positioning applications the unique slow speed function can be applied.

The MCI 25B controller is typically applied on demanding braking applications such as saws, cranes, automatic doors, etc.

Features	yy Adjustable acceleration time, 0 – 10 seconds	yy Automatic detection of missing phase(s)
	yy Initial torque adjustable from 0 – 85%, with or	yy Automatic adaptation to 50/60 Hz
	without kick start (break-away)
		yy Unlimited start and stop per hour
	yy Adjustable DC injection brake, 0 – 50 A DC
		yy IP 20 protection
	yy Fast acting brake mode with automatic motor
	field reduction	yy Compact DIN rail mountable design
	yy Automatic stop detection	yy EN 60947-4-2
	yy Universal control voltage 24 – 480 V AC/DC	yy CE, C-tick
	yy Slow speed function, 7.5% or 10% of nom.
	speed
	yy SCR aux. contacts for external control of
	by-pass, I-O and mechanical brake

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Data sheet | Soft Start Motor Controller, Type MCI 25B

Adjustments

Motor torque

(voltage) Ramp-up time 0 – 10 sec.

Kick Start selectable

Initial torque up to 85% of nom. torque

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Slow speed

7.5% or 10%

Braking torque 0 – 50 A

Selection guide	Operational	Motor	Motor	Control	Module
	voltage	current	power	voltage	dimensions	Code no.
	[V AC]	[A]	[kW/HP]	[V AC/DC]	[mm]
	208 – 240	25	7.5/10	24 – 480	90	037N0061
	380 – 480	25	1/15	25 – 480	90	037N0062

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Data sheet | Soft Start Motor Controller, Type MCI 25B

Technical data	Control circuit specifications

	Control voltage range	24 – 480 V AC/DC
	Pick-up voltage max.	20.4 V AC/DC
	Drop-out voltage min.	5 V AC/DC
	Max. control current for no operation	1 mA
	Control current / power max.	15 mA / 2 VA
	Response time max.	70 ms
	Ramp-up time	Adjustable from 0 to 10 Sec.
	Brake current	Adjustable from 0 to 50 A
	Initial torque	Adjustable from 0 to 85 % of nominal torque with
	Initial torque	optional kick start
		optional kick start
	SCR aux. contacts, voltage/current max.	24 – 480 V AC / 0.5 A (AC-14, AC-15)
	SCR aux. contacts, max. fuse	10 A gL/gG, I2t max. 72 A2s
	Design standard	CE marked according to EN 60947-4-2
	EMC immunity	Meets requirements of EN 50082-1 and EN 50082-2

Output Specifications

Operational current max. (AC-3, AC-53a)		25 A
Motor size at:
208 – 240 V AC		0.7 – 7.5 kW (1 – 10 HP)
380 – 480 V AC		1 – 11 kW (1.5 – 15 HP)
Leakage current max.		5 mA
Minimum operational current		50 mA
Overload relay trip class		Class 10
Semiconductor protection fusing
Type 1 co-ordination		80 A gL/gG
Type 2 co-ordination	I2t (t = 10 ms)	6300 A2 S
Rating index		Slip ring motors: 25A: AC-52a: 4-13: 100-3000
		Asynchronous motors: 25A: AC-53a: 8-3: 100-3000

Insulation

Rated insulation voltage, Ui	660 V AC
Rated impulse withstand voltage, Uimp	4 kV
Installation category	III

Thermal Specification

Power dissipation for continuous duty Pd max.	2 W/A
Power dissipation for Intermittent duty Pd max.	2 W/A x Duty cycle
Ambient temperature range	-5 °C – 40 °C
Cooling method	Natural convection
Mounting	Vertical +/- 30 °C
Max. ambient temperature with limited rating	60 °C, see derating for high temperatures in chart below
Storage temp. range	-20 °C – 80 °C
Protection degree/pollution degree	IP 20 / 3

Materials

Housing	Self extinguishing PPO UL94V1
Heatsink	Aluminum black anodized
Base	Electroplated steel

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