Nidec Control Techniques HVAC Drive H300 HMI Bypass, Installation And Commissioning Manual

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12 HMI Bypass Controller Installation and Commissioning Guide
2.5.4 Control Circuit Wiring
2.5.4.1 Analog Input
A 4 to 20 mA analog input signal is available by connecting to the customer
terminals 5 (+) and 4 (-).
Terminal No. Description
4 0V Common Analog
5 Speed/Frequency Reference
2.5.4.2 Digital Inputs
The HMI bypass combines digital inputs from the HVAC H300 VFD and SI-I/O
option module. As per the following table, the HMI bypass control provides
ten (10) digital inputs.
There are ten (10) digital inputs. (24 Vdc).
Terminal No. Description
1 (3 positions) 0V Common
22 Fireman’s Override
23 Damper Feedback
24 Fire Alarm
25 Customer Reset
27 Auto Run
29 Enable
203 Safety
204 Relay Output Select (223)
207 Remote Bypass Select
208 Remote VFD Select
Terminal 204 is used as an input signal to control terminal 223 relay output
when terminal 223 is set to “T204 24V Input”. All digital inputs are dry
contacts (voltage free).
2.5.4.3 Relay Outputs
There are two (2) form A relay outputs.
Terminal No. Description
221 System Fault
222 0V Common for dry contacts 221 & 223
223 System On or 204 24V Input
When Relay Output Select is set up for “204 24V Input” terminal 223 will be
controlled by the input on terminal 204.