Innotech Genesis II Digital Controller (v5) - Manual (Page 84)

Genesis II Installation Instructions
Page 84 © Mass Electronics Pty Ltd 2010 Edition 2.0 dated 06/12/2013
Before checking the digital output circuits, it is important to ensure that there are no short circuits
in the external wiring which could cause the contact current to exceed the rated amount. Current in
excess of this through the relay contacts will result in permanent damage to the unit.
Following is a general description of the process for safely checking digital output circuits. Specific
procedures for checking the wiring are provided toward the end of this paragraph (see Figure 4-4 ).
With power applied to the digital output circuits, but not to the Genesis unit, the output circuits are
checked for operation. Devices connected between the NO and C terminals should be de-energised.
If the operational status cannot be determined by observation (indicator lamp on/off, fan running/
not running, etc.) a voltmeter is placed across the device to determine whether or not it is energised.
The output circuits are then checked for the opposite condition. For circuits using the NO contacts,
a jumper wire is temporarily connected between the NO and C terminals; the associated device is
checked to make sure it is energised.
Before performing the following procedures ensure there are no short circuits in the digital output wiring which
could cause the relay contact current to exceed the maximum amperes, excess relay contact current will cause
permanent and irreparable damage to the unit.
IMPORTANT
The following are procedures for checking digital output wiring; refer to the Electrical Installation
chapter for output terminal numbers for the applicable Genesis units:
1. Ensure there is no operating power applied to the Genesis unit to be checked nor is power
applied to any of the digital output circuits.
2. Start at the first device connected to the NO contacts. If the device cannot be checked for
operation by simple observation, connect a digital voltmeter across it. Set the voltmeter range
for the expected voltage.
3. Apply operating power to the output device.
4. Determine that the device is de-energised, either by direct observation of the device itself or by
checking that the volt-ohm-meter indicates an open circuit.
5. Remove operating power from the output device.
6. Temporarily connect a jumper wire between to NO and C contacts. Ensure that the jumper wire
is of adequate size to temporarily carry the load.
7. Apply operating power to the output device.
8. Determine that the device is energised, either by direct observation of the device itself or by
checking that the voltmeter indicates full operating voltage.
9. Remove operating power from the output device.
10. Remove the jumper wire connected in Step 6.
11. Repeat Step 2 through Step 10 for the remaining output devices connected to the NO contacts.