Description
System integrators browsing for a compact frequency inverters would find the SCM series offered by Lenze an ideal choice. It is contained in a compact IP20 enclosure and fits for applications that require variable speed, soft starting or reversing operation. The frequency inverter can be with dynamic braking resistors to implement fast stopping or deceleration features.
The SCM series frequency inverters consist of various models that support output power between ⅓ HP to 15 HP. This offers a great range of options for system integrators that are replacing faulty inverters or installing one in a new equipment.
Technicians performing installations on SCM series frequency inverters will find the terminal connections arranged systematically. Connections to the start/stop button, analog input, and the digital input/output can be performed easily, thanks to the clearly assigned terminals. The inverter also has high voltage terminals designated for input power, DC bus, and output motor control.
Configuring and commissioning the SCM series frequency inverters is are also a relatively easy affair with the programming buttons, 3 digits LED display and the Electronic Programming Module (EPM). The buttons and LED display allows modifying the configuration values of the frequency inverter. System installer can also use the EPM to reduce the programming time.
Any fault that occurs during the operation of the SCM series units will be reflected as error codes in the LED display. This allows the respective personnel to perform remedial actions based on the nature of the faults that occur.
The SCM Series at a glance:
- Output power: 1/3 HP to 15 HP (0.25 to 11 kW).
- Supports dynamic braking option
- Connections: start/stop, analog input, digital inputs and outputs (3/1)
- IP20 enclosure
- Configuration with button and LED display or Electronic Programming Module.
Technical documentation for the SCM Series Drive, and all AC Tech brand drives, is available in our
Technical Library.
SM420 SCM Series Features
1. SM420 SCM Series Motor Overload Protection
The SCM Series frequency inverters are built in with UL-approved solid-state overload protection. This eliminates the need for an external protection of thermal relay circuit for the single motor application. The drive will enter an overload fault state when the drive current hits 150% of the output capacity for one minute.
2. SM420 SCM Series Electronic Programming Module (EPM)
The Electronic Programming Module or EPM offers a time-saving solution in configuring the SCM series frequency inverters. The downtime when replacing a frequency inverter is minimal, as the EPM can be transferred to the new unit to operate immediately. The configuration stored in an EPM can also be duplicated to other EPMs.
3. SM420 SCM Series DC Braking
The DC Braking option can be configured on the SCM series frequency inverter. Installers can set the duration of the DC Braking voltage applied and the magnitude of the voltage itself. The conditions of when the DC Braking is activated can also be configured by choosing either COAST WITH DC BRAKE or RAMP WITH DC BRAKE.
SM420 Other SCM Series Features
1. SM420 SCM Specifications
- Conformity : CE Low Voltage Directive (2006/95/EC)
- Approvals : UL 508C Underwriters Laboratories - Power Conversion Equipment
- Storage Temperature : -20° to 70° C
- Ambient Operating Temperature : 0° to 40° C (derate 2.5% per °C above 40°)
- Ambient Humidity : < 95% (non-condensing)
- Altitude : 3300 ft (1000 m) above sea level (derate 5% per additional 3300 ft)
- Input Line Voltages : 120, 208/240, 400/480 Vac Input Voltage Tolerance +10%, -15%
- Input Frequency Tolerance : 48 to 62 Hz
- Output Wave Form : Sine Coded PWM
- Output Frequency : 0 - 240 Hz
- Carrier Frequency : 4 kHz to 10 kHz (10 kHz requires derating; see parameter P02)
- Service Factor : 1.00 (up to 8 kHz carrier; derate for 10 kHz; see parameter P02)
- Efficiency Up to : 98%
- Power Factor (displacement) : 0.96 or better
- Overload Current Capacity : 150% for 60 seconds, 180% for 30 seconds
- Speed Reference Follower : 0-10 VDC, 4-20 mA
- Digital Outputs : (1) Normally open relay; contacts rated 3 amps at 250 Vac ; (1) Digital output (current-sourcing); rated 50 mA at 12 VDC
- Earth Leakage Current (EN 50178) : SCL: > 3.5 mA to PE SCM: < 3.5 mA to PE
2. [PRODUCT_CKU] Input Voltage Ratings
- SM000S Series drives are rated for 120 Vac single phase, 50-60 Hz input. The drive will function with input voltage of 120 Vac (+10%, -15%) at 48 to 62 Hz.
- SM200S & SL200S Series drives are rated for 208/240 Vac, single phase, 50-60 Hz input. The drive will function with input voltage of 208 to 240 Vac (+10%, -15%), at 48 to 62 Hz.
- SM200 Series drives are rated for 208/240 Vac, three phase, 50-60 Hz input. The drive will function with input voltage of 208 to 240 Vac (+10%, -15%) at 48 to 62 Hz.
- SM400 Series drives are rated for 400/480 Vac, three phase, 50-60 Hz input. The drive will function with input voltage of 400 to 480 Vac (+10%, -15%) at 48 to 62 Hz.
3. SM420 UL508 Safety Standards Compliance
- Suitable for use on a circuit as described in Section 3.2 (Installation) of the SCM series manual.
- Use minimum 75 °C copper wire only, except for control circuits.
- For control circuits, use wiring suitable for NEC Class 1 circuits only.
- Shall be installed in a pollution degree 2 macro-environment
4. SM420 Installation According to EMC Requirements
- The SCM and SCL Series can be installed to meet the European standards for Electromagnetic Compatibility (EMC) requirements.
- The input to the drive (or group of drives) must include a filter to reduce the electrical noise reflected back to the AC Line
- The SCL Series includes a filter that has been tested to meet the industrial standards set by the EU, EN 61800-3 for conducted emissions and EN 55011 for radiated emissions to class A compliance when installed in a control cabinet with a motor cable < 10m.
- The SCM can be installed to meet these same standards when used with an appropriately installed external line filter.
