Service Guide MINI SPEED
Service Guide MINI SPEED
1.1 Introduction
The minispeed "MS 60", "MS 140", "MS 200" series are four quadrant
amplifiers, constructed on an european simple pc board.
The output power stage (mosfet or IGBT) is controlled using the PWM
technique (20 Khz).
These amplifiers are designed for driving small and medium servomotors
where dinamyc performance and fast response are requested.
The speed control is made by tachogenerator ,armature or encoder
feedback.
For its supply is requested single phase power supply.
The calibration components are avalaible at removable personality
header.
If an amplifier module is replaced,it is important to verify that the new
amplifier module is calibrated as the one removed.
This is easily accomplished by simply installing the personality header
from the removed amplifier module into the new one.
We can adapt dinamyc costant,respect standard, by new personality
header.
For to use various options available on amplifier, we must open or close
the solder bridges in “adjustment zone”.
The minispeed amplifier has a “drive ok” green led and a”fault” red
avalaible on the frontal of the amplifier.
5.3 Fault research
1) When we applying power OK green led doesnʼt light.
Supply voltage not correct
- Control by instrument between +AT and -AT
2) OK green led is light,but servomotor donʼt start when we enable the amplifier.
Velocity signal isnʼt present
- Verify input signal
3) When we enable amplifier,OK green led doesnʼt light and O.C. red led is lighted.
There is a short circuit on motor
Wire or servomotor winding is
connect to ground
- Turn off the main power
- Verify the proper wiring
- Verify the motor
- Disconnect the servomotor and verify its
insulation with a tester.
4) When we enable ,the servomotor runaway and m.d. red led is lighted.
There isnʼt present tacho signal
Motor cables or tacho cables
are reversal
- Turn off the main power
- Verify with an instrument, the value directly on the
amplifierʼs terminals.
5) With armature feedback,when we enable
m.d. red led is lighted
Solder bridge JP 10 close
- Open solder bridge
- Invert motor or tacho cables
6) When we enable the servomotor is stop and
m.d. red light is lighted.
Motor isnʼt connect
- Verify the presence of connections.
7) When we enable servomotor turn at high speed and
m.d. red led doesnʼt light
Potentiometer speed calibration
isnʼt correct.
- Verify the proper procedure about “ADJUSTMENT”
(see page 26/27).
8) During the deceleration phase OK green led switch off.
Voltage exceed maximum limit - Verify the capacitor values(see chapter power supply
page 34).
9) During the working phase S.T. red led lighted and sevomotor stop.
Happened max temperature
thermoswitch
- Room temperature is greater then 40 °C.
- There isnʼt present forced cooling where is
required.
Summary of Contents for Minispeed MS 140
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