Siemens MICROMASTER 420 Reference Manual

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MICROMASTER 420 Reference Manual
Issue A1
vii
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Figure 2-1 Current Limit Interaction .........................................................................................................8
Figure 2-2 PTC Resistor Connections ..................................................................................................10
Figure 2-3 Boost Level...........................................................................................................................11
Figure 2-4 Quick response with overshoot: P2280 = 0.30; P2285 = 0.03 s..........................................14
Figure 2-5 Quick response with overshoot, but instability: P2280 = 0.55; P2285 = 0.03 s ....................15
Figure 2-6 Damped response: P2280 = 0.20; P2285 = 0.15 s...............................................................15
Figure 2-7 Response to 5 Hz step: L = 100 ms .....................................................................................16
Figure 2-8 Response to 5 Hz step: T = 700 ms .....................................................................................17
Figure 2-9 Step Response in PI control with P2280 = 9.84 and P2285 = 0.30......................................17
Figure 2-10 PI Basic Block Diagram........................................................................................................19
Figure 2-11 Frequency Ramp Down........................................................................................................20
Figure 2-12 DC Braking...........................................................................................................................20
Figure 2-13 Compound Braking...............................................................................................................21
Figure 2-14 Derating with Temperature...................................................................................................22
Figure 2-15 Derating with Altitude............................................................................................................24
Figure 2-16 Power Losses.......................................................................................................................38
Figure 3-1 Typical RS485 Multidrop Interface........................................................................................42
Figure 3-2 Telegram Structure...............................................................................................................43
Figure 3-3 Address (ADR) Bit Numbers.................................................................................................44
Figure 3-4 Useful Data Characters ........................................................................................................44
Figure 4-1 Inverter with Filter.................................................................................................................66
Figure 4-2 Inverter with Input Choke......................................................................................................67
Figure 4-3 Inverter with Output Choke...................................................................................................68
Figure 6-1 Fan Removal........................................................................................................................78

Siemens MICROMASTER 420 Specifications

General

Power Range	0.12 kW to 11 kW
Output Voltage	0 to input voltage
Input Frequency	47 Hz to 63 Hz
Output Frequency	0 Hz to 650 Hz
Overload Capacity	150% for 60 seconds
Enclosure Rating	IP20
Input Voltage	200 V to 240 V (±10%), 380 V to 480 V (±10%)
Control Type	V/f control
Braking	Optional braking module
Protection Features	Overcurrent, overvoltage, undervoltage, overload, short circuit, ground fault
Cooling	Air-cooled
Ambient Temperature	-10 °C to +50 °C
Communication Interfaces	USS protocol