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5 motor status byte, 6 checksum, 7 “speed” run command – ebm-papst ECI-63.XX-K4 User Manual

Page 83: 1 requirements, 9 rs485 communication

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9 RS485 Communication

9.5 Motor status byte

The bits of the motor status byte have the following meaning:

Bit

Meaning

Comment

0

bUebertemperatur

1 = Drive detects overtemperature

1

bMotorAktiv

1 = Drive is active

2

bUeberspannung

1 = drive detects overvoltage

3

bUnterspannung

1 = drive detects undervoltage

4

bHWFehler

1 = drive detects hardware fault

5

bUeberstrom

1 = drive detects overcurrent

6

bQuittErforderlich

1 = drive needs an acknowledgement

7

bDBereit

1 = drive is ready

9.6 Checksum

The checksum is calculated as follows:
• All bytes including the start byte are added together.

– As, in special cases, the sum can be 0 and an empty telegram would be interpreted as “Run command speed with target speed = 0 and

maximum current = 0”, the sum is disjuncted with 0 x 55. In this way the special case is detected.

Formula: Checksum = (sum (Byte0..last_Byte)) || 0x55

9.7 “Speed” run command

The “speed” run command described here initiates speed-controlled operation, if the setpoint selector of the drive has been used to activate
“RS485 speed input”.

NOTe

In the case of static operation with a speed, the command must be sent cyclically every 2 sec. at the latest, as otherwise
the drive detects a bus interruption and specifies an error speed (parameter 0x16).

9.7.1 Requirements

RS485 Char

Use

Value / Comment

1

Start byte

COM_CRX_FAHRBEFEHL_DREHZAHL

2

Address byte

Bus address

3

Target speed Hi

rpm, -32768…32767

4

Target speed Lo

5

Maximum current Hi

6

Maximum current Lo

0-100 %

7

Checksum

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