Innotech Maxim - Manual (Page 47)

Page 47
MAXIM Installation Instructions
© Mass Electronics Pty Ltd 2011 Chapter 5 – Commissioning
V
AC
V
DC
0V
+
CHECKING UNIVERSAL
INPUT SOURCE VOLTAGE
Connected to equipment
or device
Disconnected from
MAXIM controller
EARTH
5-2.2.2 Checking Universal Inputs
Before any Universal Inputs are connected to a MAXIM Series controller, you MUST follow the steps
listed below to verify that 0VAC is measured across these inputs. Please note that the voltage will be
measured directly at the Universal Input wiring, and NOT at the controller, as illustrated in Figure 5-2
below. These steps do not apply if a DC source is connected to the Universal Inputs. In this case the
expected voltage to be measured would be that of the source voltage.
Please note that these instructions are also applicable in situations where a Universal Input / Output
on a MAXIM Series controller is configured as a Universal Input. The Universal Input / Output can be
commissioned according to whether it is configured as a Universal Input or a Universal Output.
1. Verify that ALL Universal Inputs are labelled and disconnected from the controller.
2. Verify that the power to the controller is turned OFF.
3. Verify that the power to the equipment to which the Universal Inputs are connected is turned
OFF.
4. Set the DMM voltage range to measure at least 25VAC; the AUTO setting will suit most
measurements.
5. Connect the red (+) lead of the DMM to the Universal Input wire labelled (+), and the black (–)
lead of the DMM to EARTH, as illustrated in Figure 5-2 below.
6. Observe and verify that the DMM measures 0VAC across the Universal Input wiring. If the
reading is not 0VAC, this could possibly mean that the wiring is incorrect, or the Universal Input
source may not be turned OFF.
Once you have performed these steps and verified 0V is measured across each Universal Input
wiring, reconnect the wiring one by one to the corresponding Universal Input terminal on the MAXIM
controller. It is important to observe the polarity when reconnecting the wiring to the controller.
Figure 5-2: Checking Universal Inputs for 0V