Danfoss VLT HVAC User Manual

Pulse inputs:
Programmable pulse inputs 2
Terminal number pulse 29, 33
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 section on Digital input
Maximum voltage on input 28 V DC
Input resistance, R
i
approx. 4 k
Pulse input accuracy (0.1 - 1 kHz) Max. error: 0.1% of full scale
Analog output:
Number of programmable analog outputs 1
Terminal number 42
Current range at analog output 0/4 - 20 mA
Max. load to common at analog output 500 
Accuracy on analog output Max. error: 0.5 % of full scale
Resolution on analog output 8 bit
The analog 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).
Digital output:
Programmable digital/pulse outputs 2
Terminal number 27, 29
1)
Voltage level at digital/frequency output 0 - 24 V
Max. output current (sink or source) 40 mA
Max. load at frequency output 1 k
Max. capacitive load at frequency output 10 nF
Minimum output frequency at frequency output 0 Hz
Maximum output frequency at frequency output 32 kHz
Accuracy of frequency output Max. error: 0.1 % of full scale
Resolution of frequency outputs 12 bit
1) Terminal 27 and 29 can also be programmed as input.
The digital output is galvanically isolated from the supply voltage (PELV) and other high-voltage
terminals.
Control card, 24 V DC output:
Terminal number 12, 13
Max. load : 200 mA
The 24 V DC supply is galvanically isolated from the supply voltage (PELV), but has the same
potential as the analog and digital inputs and outputs.
8. Specifications VLT
®
HVAC Drive Operating Instructions
136 MG.11.A4.02 - 09.10.06. VLT
®
is a registered Danfoss trademark
8

Danfoss VLT HVAC Specifications

General

Enclosure Rating	IP20, IP21, IP54, IP55, IP66
Storage Temperature Range	-25°C to +70°C
Output Voltage Range	0-100% of supply voltage
Communication Protocols	Modbus RTU, BACnet, Ethernet/IP, Profibus DP
Ambient Temperature Range	-10°C to +50°C (without derating)
Relative Humidity	5% to 95% non-condensing
Altitude	Up to 1000 m without derating
Cooling Method	Air cooled
Application	HVAC systems, Pumps, Fans, Compressors
Voltage Range	200-240 V, 380-500 V, 525-600 V
Frequency Range	0 Hz to 590 Hz