Innotech Genesis II Digital Controller (v5) - Manual (Page 82)

Genesis II Installation Instructions
Page 82 © Mass Electronics Pty Ltd 2010 Edition 2.0 dated 06/12/2013
4-1.2.4 Internal-Source Digital Inputs
The GENII DI REM provides eight dry contact (voltage-free) inputs to sense contact closure from
field equipment. The eight digital inputs are connected to terminals A through H (see Figure 4-3 ).
Contacts I and J are signal common terminals. The REM provides 5VDC between each input and
common. This voltage is shorted to common when the switch is closed. Check the digital input
wiring as follows:
1. Tag and disconnect the RS485 Comms cable(s) from the RS485 Comms Connector at the upper-
right corner of the REM. The cable shields may be left connected if desired.
2. Apply 24VAC operating power to the GENII DI REM. Power off other units.
3. Set the digital voltmeter range to read at least 5.0VDC.
4. Connect the voltmeter between the first digital input channel (Terminal A) and the associated
switch common (Terminal I or J). Observe polarity, ensuring the red (+) test lead is connected to
Terminal A and the black (-) test lead is connected to the switch common terminal.
5. Observe the voltmeter. It should indicate 5VDC with the input switch open.
Avoid risk of electrical shock observe all local electrical safety requirements when performing the nest step.
CAUTION
• Digital outputs are controlled by relays within the associated Genesis unit. These relays are connected to the
external circuits that can contain up to 24VAC.
• Procedures in this manual require checking these circuits with power applied. To avoid death or serious injury by
electrical shock, use extreme caution when working with energised circuits and follow precautions in this manual.
• Checks are to be performed only by qualified, licensed electricians who are familiar with local safety procedures.
Under no circumstances should anyone other than a qualified electrician perform these checks.
CAUTION
6. Manually close the input switch. If that is not practical, connect a short jumper wire across the
contacts.
7. Observe the voltmeter. It should indicate 0VDC with the input switch closed.
8. Release the manually-closed contacts. If a jumper wire was used in Step 6, remove the jumper
wire.
9. Repeat Steps 4 through 8 for the remaining digital input channels.
10. Remove operating power from the REM.
11. Reconnect the RS485 cable that was disconnected in Step 1.