Illustration 10.1 PELV Isolation
Pulse
Programmable pulse 2/1
Terminal number pulse 29
1)
, 33
2)
/ 33
3)
Max. frequency at terminal 29, 33 110 kHz (Push-pull driven)
Max. frequency at terminal 29, 33 5 kHz (open collector)
Min. frequency at terminal 29, 33 4 Hz
Voltage level see 10.2.1
Digital Inputs
Maximum voltage on input 28 V DC
Input resistance, R
i
approx. 4 kΩ
Pulse input accuracy (0.1-1 kHz) Max. error: 0.1% of full scale
Encoder input accuracy (1-11 kHz) Max. error: 0.05 % of full scale
The pulse and encoder inputs (terminals 29, 32, 33) are galvanically isolated from the supply voltage (PELV) and other high-
voltage terminals.
1)
only
2)
Pulse inputs
are 29 and 33
Analog output
Number of programmable analog outputs 1
Terminal number 42
Current range at analog output 0/4-20 mA
Max. load GND - analog output 500 Ω
Accuracy on analog output Max. error: 0.5% of full scale
Resolution on analog output 12 bit
The analogue output is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
Control
card,
RS-485
serial
communication
Terminal number 68 (P,TX+, RX+), 69 (N,TX-, RX-)
Terminal number 61 Common for terminals 68 and 69
The RS-485 serial communication circuit is functionally separated from other central circuits and galvanically isolated from the
supply
voltage
(PELV).
Specifications
VLT
®
HVAC Drive Operating Instructions
MG11AI02 - VLT
®
is a registered Danfoss trademark
79
10 10
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