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MELLTRUM (222-84XX)


240 VAC
HP

460 VAC
HP
ARM
VOLTS
DC
FIELD
VOLTS
DC
100% DC
ARMATURE
CURRENT

MODEL
NUMBER

PART
NUMBER
5 - 10 5 - 20 240/500 150/300 34 MELLTRUM 1 222-8420C
15 - 30 25 - 60 240/500 150/300 102 MELLTRUM 2 222-8460
40 - 50 75 - 100 240/500 150/300 160 MELLTRUM 2+ 222-8460+
40 - 60 75 - 125 240/500 150/300 202 MELLTRUM 3 222-8410
75 - 125 150 - 250 240/500 150/300 424 MELLTRUM 4 222-8425
150 300 240/500 150/300 480 MELLTRUM 4+ 222-8430
200 400 240/500 150/300 640 MELLTRUM 4+4 222-8440
250 - 350 500 - 700 240/500 150/300 1200 MELLTRUM 5 222-8470

NOTE: OTHER LINE VOLTAGES AVAILABLE 208, 380, 416



GENERAL DESCRIPTION
  • Six SCR Full Wave Power Bridge - Provides improved form factor for greater efficiency of operation.
  • Inner Loop Current Regulator - Inherent high band width capability for fast response.
  • Separately Adjustable Linear Accel/Decel Control - 2-30 seconds.
  • Speed Regulator - 2% accuracy using armature voltage feedback with IR compensation or 1% accuracy with tachometer feedback. Regulation may be improved be selecting the proper motor mounted tachometer.
  • Current (Torque) Regulator - With less than 1% error in the armature current regulator, the operator can control motor torque instead of speed.
  • DC Overload (Armature) - Senses overcurrent with inverse time trip.
  • AC Line Connections - The MELLTRUM is completely insensitive to AC line phase sequencing.
  • Heat Sink Thermal Switch - Prevents long term thermal damage to SCRs due to loss of cooling or overheating (not included in MELLTRUM 1, which has no cooling fan).
  • Fault Trip - Instantaneous fault trip protection circuit designed to shut the drive down if any of the following conditions occur:
    • Fields Loss (Defeatable)
    • Heat Sink Overtemperature (except MELLTRUM 1)
    • Instantaneous Overcurrent (300% of rated)
    • Inverse Time DC Overload
  • Test/Reset - If any of the previously described fault conditions occur, the drive can be reset by depressing the RESET button on the main circuit board. The fault light will not reset if the fault condition is still present.
  • Field Loss Protection - Provides protection against runaway, due to loss or motor field, by shutting down the drive.
  • Dual Frequency Operation - Can be operated from 50 or 60Hz AC power supplies by a simple jumper change.
  • Exclusive Static Adjustable Current Limit - Allows static setting of desired current limit value without applying DC power and without a connected output load. A current limit indicating light is also supplied to provide visual indication when the preset current limit value is reached.
  • Isolated Control Circuitry - High impedance resistor isolation of the control circuits from the power bus provides protection in the event of a ground fault. The ammeter, speed potentiometer, and tachometer are not at line potential. Current transformers on each of the three AC lines provide an isolated armature current signal to the main circuit board. When tachometer feedback is employed, the drive control circuits are completely isolated form the AC power bus.
  • Jog at Preset Speed - Separately adjustable from 0 to 30% of base speed.
  • Control Regulator Circuit Board - Common circuitry throughout the MELLTRUM line of controls. MELLTRUM 1,2, 2+, and 5 use the same board. MELLTRUM 3, 4, and 4+ boards have an extra one inch margin on the left and right sides but all are electrically identical.
  • Instantaneous Overcurrent Protection - Senses armature fault currents quickly to protect both semiconductors and motors against damaging current levels.
  • High Speed Current Limiting SCR Semiconductor Fuses - Provides the utmost in fuse coordination and protection of the SCRs and motor with positive circuit clearing for both AC and DC faults.
  • AC Line Filter and Transient Voltage Suppressor Network - Eliminates interaction between other drives or AC equipment. *
  • Standard Adjustments - Maximum speed, minimum speed, jog speed, separate acceleration and deceleration time, stability, current limit, and IR compensation.

    *Note: Severe System Applications may require additional electrical equipment to insure proper drive operation.

Melltrum Specifications

MODEL HORSEPOWER
RATING
AC POWER
INPUT
DC POWER
OUTPUT
FIELD
OUTPUT
HEAT
LOSS

240/3/60

430/3/60

VOLTS
MAX
AMPS

VOLTS
MAX
AMPS

VOLTS
MAX
AMPS
MAX
WATTS
MELLTRUM 1 5-10HP 5-20HP 240/480 23 240/500 34 150/300 6 117
MELLTRUM 2 15-30HP 25-60HP 240/480 84 240/500 102 150/300 6 367
MELLTRUM 2+ 40-50HP 75-100HP 240/480 139 240/500 160 150/300 10 502
MELLTRUM 3 40-60HP 75-125HP 240/480 174 240/500 202 150/300 16 608
MELTLRUM 4 75-125HP 150-250HP 240/480 343 240/500 424 150/300 16 1100
MELLTRUM 4+ 150HP 300HP 240/480 402 240/500 480 150/300 16 1300
MELLTRUM 4+4 200HP 400HP 240/480 536 240/500 640 150/300 16 1500
MELLTRUM 5 250-350HP 500-700HP 230/460 940 240/500 1200 150/300 25 3000

SERVICE CONDITIONS
  • Rated Voltage Input: 240 and 480 volts (203, 380, and 416 volts available, consult factory) (-10, +10%) AC three phase
  • Frequency: 50/60 Hz ( 2 Hz)
  • Ambient Temperature: 0-40C (32F to 104F)
  • Altitude: Sea Level to 3300 Feet

    Efficiency at Rated Output:
  • Power unit 98% or better depending on selected rating
  • Drive system 82% or better depending on selected rating

    Input Signal Requirements:
  • 10V DC at 1 MA (nominal) for maximum speed reference

    Potentiometer:
  • 2000 Ohms, 2 Watt

    Main Circuit Board Indicators - Light emitting diodes (LEDs) on the main circuit board for:
  • AC Power On
  • DC Power On
  • Current Limit
  • DC Overload
  • Phase Loss

    Fault Trip In addition, six separate LEDs indicate that each firing circuit is producing pulses.

    Performance Specifications:
  • Controlled Speed Range: 20:1 for basic control, may be extended to 200:1 with modification kit.
  • Speed Regulation:
    For a 95% Load Change:
      Voltage Regulated-2-5% of maximum speed
      Speed Regulated -1% of maximum speed (with any AC or DC Tachometer)
    For All Other Variable Drives:
      Voltage Regulated-changes up to 15% of top speed can result from temperature variations, voltage and frequency variations and drift.
      Speed Regulated-Any AC Tachometer-2%
      Speed Regulated-Any DC Tachometer-1%
  • May be modified to achieve 0.1% due to 95% load change and 0.15% due to all other variables.
  • Overlaod Capacity: 150% of Rated Current for 1 Minute
  • Service Factor: 1.0

    Adjustment Ranges (Typical)
  • Minimum Speed: 0 to 30% rated speed
  • Maximum Speed: 60 to 120% rated speed
  • Acceleration Time: 2 to 30 seconds (linear)
  • Jog Speed: 0 to 30% rated speed
  • IR Compensation: 0 to 22% rated voltage
  • Current Limit: 0 to 150% rated current

MOUNTING DIMENSIONS FOR MELLTRUM

DRIVE A B C D E F G DIA H WT.-LBS.
MELLTRUM 1 14.50 11.63 10.50 10.75 2.00 0.44 .281 8.00 22
MELLTRUM 2 18.00 11.63 14.00 10.75 2.00 0.44 .281 8.00 26
MELLTRUM 2+ 18.00 11.63 14.00 10.75 2.00 0.44 .281 8.00 29
MELLTRUM 3 22.00 15.63 12.75 13.63 4.75 1.00 .321 9.00 45
MELLTRUM 4 21.00 21.00 19.25 19.25 0.88 0.88 .5 13.00 70
MELLTRUM 4+ 21.00 21.00 19.25 19.25 0.88 0.88 .5 13.00 80
MELLTRUM 4+4 21.00 21.00 19.25 19.25 0.88 0.88 .5 13.00 80
MELLTRUM 5 33.00 27.00 31.25 25.25 0.88 0.88 .5 16.25 200



REV DATE: 7/23/2012


2006 SCR Controls, Inc.
3479 Gribble Rd., Matthews, NC 28104
PO Box 2368, Indian Trail, NC 28079
email: info@scrcontrols.com

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