Baxall ZR-DC/WBX, Руководство по установке

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Page 9
Installation and Operating Instructions ZR-DC/WBX
PAN AND TILT HEAD FEEDBACK POTENTIOMETERS
DANGER OF ELECTRIC SHOCK. SWITCH OFF POWER BEFORE ALTERING ANY PAN AND TILT HEAD CONNECTIONS
Determining the supply connections
The supply connections to the feedback potentiometers can be identified using a Digital Voltmeter (DVM) set to measure
resistance as follows.
Connect the DVM to any two of the four wires. Actuate both the pan and tilt functions and observe the changes in the
resistance readings of the DVM. The DVM will be connected according to the table below.
Observations Connection
No resistance change when both
pan and tilt are actuated
Resistance reading is changed by pan or tilt
actuation (not both)
Resistance reading changes when
both pan and tilt are actuated
When the DVM is connected according to A above, the supply wires have been correctly identified. Connect the supply
wires to the preset PCB as follows: Positive supply wire to CON 1 terminal 3, Negative supply wire to CON 1 terminal 8.
Determining the pan and tilt potentiometers
Connect the DVM to one of the remaining two wires and the negative supply connection. Actuate the pan function only and
see if the measured resistance changes. If the resistance changes, the wire is connected to the pan feedback potentiometer,
if it doesn’t, the wire is connected to the tilt potentiometer. Confirm this by actuating the tilt function and checking the
resistance changes with respect to the negative supply connection. Connect the wires to CON 1 according to the
following: Pan potentiometer to terminal 5, Tilt potentiometer to terminal 4.
Checking correct feedback potentiometer operation
Set the DVM to measure voltage (e.g. 0 to 20V DC) and connect it across the negative supply connection and the tilt
potentiometer connection (CON 1 terminal 8 and CON 1 terminal 4) Operate the tilt function. The voltage measured
should decrease towards 0V as the pan and tilt head is tilted up , and towards 5V as the head is tilted down . If the opposite
occurs, the supply connections are probably incorrect. Exchange the CON 1 terminal 3 and CON 1 terminal 8 connections
with each other.
Next, check the pan function by connecting the DVM across the negative supply and pan potentiometer terminals (CON
1 terminal 8 and CON 1 terminal 5). As the head is panned to the left , the voltage measured should increase towards 5V.
As the head is panned to the right , the voltage measured should decrease towards 0V. If the opposite occurs, use the
mode reversal switch on the preset PCB (SW1, switch 6) to reverse the pan function operation. Note that the switch won't
affect the voltage measured, instead it changes the way the receiver interprets the feedback voltage swing.
Testing
Set up a preset position using the telemetry transmitter according to its instructions, and check the operation and
accuracy of the preset. If all is well, use the same methods to determine the zoom and focus feedback connections.
Note: If after making the zoom and focus connections both the pan and tilt feedback potentiometers do not operate
correctly, try reversing the lens feedback supply connections.
A
B or C
D