Johnson Controls York MV VSD Operation Manual page 27

Figure 20: I/O board
Display/keypad (DISP/IPAD drawing designations): The display/keypad is mounted on the back of the door to
the low voltage section. The main purpose of this device is to provide time stamp references for events logged
within the MV VSD logic.
Additionally it provides an Ethernet connector to which a laptop PC can be connected for factory testing purposes.
All other functions of the display/keypad are duplicated through the OptiView panel. Buttons on the keypad permit
local control of MV VSD speed. However normally this keypad must be left in the remote mode to permit control
to be governed by the OptiView panel. System status and fault information can be viewed on the device's display
screen, however this same information is communicated to the OptiView panel for display on the OptiView screen.
Figure 21: MVVSD display/keypad
This device operates on 24 VDC that is derived from the power supply and is connected to the EXIO and XIO
boards. Display data is sent from the gate driver board connector CN21 through the shield cable to CN1 on the
display. Control signals are passed to/from the logic board via a similar shielded cable plugged into CN22 on the
logic board from CN3 on the display.
Although these connectors look very much like standard Ethernet connections, do not attempt to connect any type of PC
hardware to these connectors. There are control signals present in these cables that are not compatible with Ethernet
communications that could destroy the PC.
The display/keypad has several characteristics defined as follows:
CAUTION
Medium Voltage Variable Speed Drive Operation Guide
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System architecture
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