Product Overview

SMARTVFD HVAC
63-4520—09 2
* If 230VAC is used as control voltage from the output relays, the control
circuitry must be powered with a separate isolation transformer to limit
short circuit current and overvoltage spikes. This is to prevent welding on
the relay contacts. Refer to standard EN 60204-1, section 7.2.9.
SmartVFD BYPASS Features
The Smart VFD BYPASS is available in 5 configurations as
explained below. All configurations are available in
NEMA 1, NEMA 12 and ventilated NEMA 3R.
SmartVFD Disconnect:
Fused Disconnect with no bypass
SmartVFD 2-Contactor:
Provides an economical means of bypassing the VFD.
• No Main Disconnect
• Freeze/Fire/Smoke Interlock
SmartVFD 3-Contactor:
Commission, service or replace the VFD without affecting
the operation of the motor. Provide additional bypass
control capabilities with Auto-bypass and HOA options.
• Fused Disconnect
• Freeze/Fire/Smoke Interlock
• VFD can be isolated from power with motor running in
BYPASS mode
• TEST position powers the VFD without sending power
to the motor
SmartVFD 3-Contactor Options:
AUTO-BYPASS
• Any VFD fault will automatically send the bypass to
BYPASS mode
• A contact closure sends the bypass to BYPASS mode
• Dry contacts indicate when the bypass is in BYPASS
mode, alerting the building management system.
Table 1. General.
Communication
RS485 Standard: Modbus™ RTU, BACnet, N2
Ethernet Standard: Modbus/TCP, BACnet/IP
Software features
Energy-saving
functions
• Real-time clock for timed functions
• Energy monitor for kWh monitoring
• Sleep function to minimize downtime energy
Protections
• Overload and underload protections (e.g. broken fan and dry pump)
• Motor thermal protection
• Missing phase detection
• Automatic reset to avoid interruption of the process
Process control
2 * PID For process control
Multipump For replacing the pump controller
Flying start For tripless catching of spinning fan
Human
interfaces
Keypad Graphical display with built-in manual and wizards.
PC Tools
• PC Commissioning Tool for easy commissioning, monitoring, and troubleshooting.
• Energy Savings calculator to estimate cost avoidance.
• Product selection tool for selecting VFD and bypass, and creating submittal
documents.
Table 2. I/O Connections.
Basic I/O Board
Terminal Signal
1 +10 Reference output
2 AI1+ Analogue input, voltage or current
3 AI1- Analogue input common (current)
4 AI2+ Analogue input, voltage or current
5 AI2- Analogue input common (current)
6 24 24 V aux. voltage
7GNDI/O ground
8 DI1 Digital input 1
9 DI2 Digital input 2
10 DI3 Digital input 3
11 CM Common A for DI1-DI6
12 24 24 V aux. voltage
13 GND I/O ground
14 DI4 Digital input 4
15 DI5 Digital input 5
16 DI6 Digital input 6
17 CM Common A for DI1-DI6
18 AO1+ Analogue signal (+output)
19 AO-
/GND
Analogue output common
30 +24 24 V auxiliary input voltage
A RS485 Differential receiver/transmitter
B RS485 Differential receiver/transmitter
Table 3. I/O Connections, Relay Board 2.
Relay Board 2
Terminal Signal
21
Relay output 1*
Switching capacity24VDC/8A
250VAC/8A
125VDC/0.4A
Min.switching load5V/10mA
22
23
24
Relay output 2*
Switching capacity24VDC/8A
250VAC/8A
125VDC/0.4A
Min.switching load5V/10mA
25
26
28
Thermistor input
Rtrip = 4.7 kΩ (PTC); Measuring
voltage 3.5V
29