MAXPLUS 231 OPTION SPINDLE AMPLIFIER
This manual is designed to help you install the MaxPlus? 231 Option Spindle amplifier.
Unpacking and Inspection
Carefully unpack the amplifier and inspect it for visible damage. Check items against the
packing list. Report any missing or damaged items to your supplier.
Warranty and Service
The amplifier is warranted to be free from defects in workmanship and materials for a period
of two years from the original shipment by MTS Automation.
During the warranty period, a defective amplifier unit will be repaired or replaced as outlined
Before requesting return authorization, please try to verify that the problem is within the
amplifier, and not with external devices.
To arrange for repair or replacement, please contact:
MTS Automation Customer Service
Monday–Friday, 8:00–4:30 Central Time
• You must provide the model and serial number from the labels on the amplifier.
• You must provide an explanation as to why the unit is being returned.
• You will be issued a return authorization number which must be marked on the return shipment
and on all correspondence.
Continued on next page
Warranty and Service (continued)
Service Under Warranty
• Return your defective unit, freight prepaid, and it will be repaired and returned within two weeks of
receipt via regular UPS, freight prepaid.
• Upon request, a factory-repaired replacement unit will be sent via regular prepaid UPS, within 4
working days. Next day shipment for overnight delivery, freight collect, is available at an
expediting charge of $100. The defective unit is to be returned via regular UPS, freight prepaid,
upon your receipt of the replacement.
• Return your defective unit, freight prepaid, and it will be repaired on a time and material basis and
returned within three weeks of receipt.
• OR contact your local distributor or MTS Automation Customer Service for a factory-repaired
exchange unit, which is available at a flat rate price, assuming the defective unit is in repairable
condition and is returned freight prepaid. Next day shipment for overnight delivery, freight collect,
is available at an expediting charge of $100.
Except as specifically modified by this warranty statement, all MTS Automation Conditions of
Sale and Warranty shall apply.
The 231 Spindle Amplifier was designed to be used with the MPM1094R-1092 spindle motor.
This motor is wound in a WYE configuration with four windings in each leg of the WYE that
are connected with a system of relay switches mounted on the side of the motor that change
the motor KE and KT. This allows up to 20 horsepower in four speed ranges, eliminating the
need for any complex mechanical gear reductions.
The TAC output of the amplifier is scaled to the speed ranges as follows:
Low Speed 1 690 rpm TAC output = .69 volts
Med Low Speed 2 1630 rpm TAC output = 1.63 volts
Med High Speed 3 3300 rpm TAC output = 3.3 volts
High Speed 4 6600 rpm TAC output = 6.6 volts
The amplifier features overcurrent sensing which will cause the amplifier to shut down and
produce an overcurrent fault if the continuous current rating of the amplifier is exceeded by
The amplifier also has an I/O selectable orient feature which causes the motor shaft to rotate
at a fixed 1 rev per sec rate in a CCW direction viewed from the shaft end of the motor.
Ramping of the command input signal for a time period that is user selectable using DIP
switches from 2 to 10 seconds, can be enabled and disabled through the I/O connector.
An analog dc voltage output that is proportioned to the output current.
The CONT (continuous) horsepower is available continuously. The INT (intermittent)
horsepower is available for 3-5 minutes. Operation above the CONT rating will result in a
motor thermal fault condition. The ratings indicated are for motors applied with fan cooling. If
the fan is not used, the ratings have to be deteriorated by 20%.
Spindle Sizes Available
CONT INT Required Amplifier Input Required
Amplifier Voltage Motor
13 24 MPA-75-SPN 230 Vac MPM1904R-1092
* This combination of amplifier and motor require the insertion of external inductors in the RST leads of the motors. These inductors deteriorate high speed torque. On the high speed winding, horsepower
ratings are typically 1/2.
There are other 230 Vac amplifiers and motors, but they must be configured as factory
Parameter Specification Operating Environment:
Temperature 0 to 45?C (32 to 113?F) Maximum, Ambient
Humidity 0 to 95% noncondensing Input/Output Interface: Analog Signals
Velocity Command Input Differential input 0 to ?10 Vdc(15 Vdc Max)
Velocity Output 1 volt per 1000 rpm
Current Output 10 volts = Rated Current 24 Volt Logic: Enable
Slow Output (open collector)
Fault Output (open collector)
Note: +30 volts open circuit; .15 amps max when ON
Fault Protection: Shorts (Stator)
Feedback Resolver Tracking
Encoder Simulation: TTL Differential Output Plus Index
Line Count - 1024 Adjustments:
0 to Rated Current Limit (CL)
Balance (BAL) Speed/Torque Regulation ?5%
Max Speed 6600 rpm Encoder Signals:
Resolution 1024 lines
Resolver Cable Length: Max. Error:
15 foot ?20 minutes
25 foot ?20 minutes
50 foot ?30 minutes
100 foot ?40 minutes
.5 mh inductors must be installed in each of the R, S, and T
phases of the motor. The following inductor is available for