MICROMASTERS operate at high voltages.
When operating electrical devices, it is impossible to avoid applying hazardous
voltages to certain parts of the equipment.
Emergency Stop facilities according to EN 60204 IEC 204 (VDE 0113) must remain
operative in all operating modes of the control equipment. Any disengagement of
the Emergency Stop facility must not lead to uncontrolled or undefined restart.
Wherever faults occurring in the control equipment can lead to substantial material
damage or even grievous bodily injury (i.e. potentially dangerous faults), additional
external precautions must be taken or facilities provided to ensure or enforce safe
operation, even when a fault occurs (e.g. independent limit switches, mechanical
Certain parameter settings may cause the inverter to restart automatically after an
input power failure.
This equipment is capable of providing internal motor overload protection in
accordance with UL508C section 42. Refer to P0610 (level 3) and P0335, I
by default. Motor overload protection can also be provided using an external PTC
via a digital input.
This equipment is suitable for use in a circuit capable of delivering not more than
10,000 symmetrical amperes (rms), for a maximum voltage of 230/460V when
protected by a time delay fuse (see Table on page 102).
This equipment must not be used as an 'emergency stop mechanism' (see EN
Only qualified personnel may enter settings in the control panels. Particular attention
must be paid to safety precautions and warnings at all times.
The MICROMASTER 420 is supplied with a Status Display Panel (SDP) and default
parameter settings that cover the following requirements:
♦ The motor rating data, voltage, current and frequency are all compatible with the
inverter data. (A standard Siemens motor is recommended).
♦ Linear V/f motor speed, controlled by an analogue potentiometer.
♦ Maximum speed 3000 min
potentiometer via the inverter's analogue inputs
♦ Ramp-up time / Ramp-down time = 10 s
If more complex application settings are required, please refer to the parameter listing in
these Operating Instructions.
For changing parameters you will need one of the optional modules "Basic Operator
Panel" (BOP) or the "Advanced Operator Panel" (AOP) described below.
Furthermore the parameters can be changed by communication options (refer to the
For instruction on how to exchange/replace the Operator Panels see Appendix A
The same BOP/AOP can be used for each MICROMASTER 420. After changing
the parameters replace the BOP/AOP by the SDP.
The terminal layout for connecting power and control cables is shown in the
photograph on the inside of the back cover of this manual.
with 50 Hz (3600 min
with 60 Hz), controllable using a
MICROMASTER 420 Operating Instructions
T is ON