VOICECOM USER MANUAL ISSUE 4
-13-
Note:
The I.S. power supply can either be connected to the controller terminals, as shown in Figure 5, or to
anywhere on the communication line to overcome the voltage drop caused by long lines. Refer to VCA approval
drawing VCOM-Z-036 for I.S. power supply connection options.
I.S. Keypad Interface
The intrinsically safe keypad interface allows an external VCA keypad module (or suitable push buttons) to be
installed in the hazardous area when the VCA is installed in a flameproof enclosure or the VCA keypad is otherwise
inaccessible.
Table 7 shows the I.S. Keypad Interface termination and Figure 6 shows the wiring connections to the VCA Remote
Keypad Module, available from Ampcontrol (p/n E08985). The keypad input functions are self explanatory. Input KP3
is the LOCK input. When the LOCK input is asserted, VCA configuration settings can be changed and Voice
Message Bank files can be downloaded. Opening the LOCK input prevents any settings from being changed. The
LOCK input should be wired to a key lock switch located adjacent to the VCA or behind the panel door.
The keypad inputs are powered from an I.S. power supply. One of the communication line I.S. power supplies can be
used. For further wiring details refer to approval drawing VCOM-Z-036.
Table 7 - I.S. Keypad Interface Connections
Terminal
Function
KP1
UP button
KP2
LEFT button
KP3
Key LOCK (allows access to VCA settings)
KP4
RIGHT button
KP5
DOWN button
KP6
ENTER button
KP7
FUNCTION button
KP8
ESCAPE button
COM
IS power supply common
NOTE:
The I.S. power supply connected to LINE 1 or LINE 2 can be used to for the VCA I.S. Keypad Interface.
+
-
+
-
COM
KP8
KP7
KP6
KP5
KP4
KP3
KP2
KP1
12VDC – 18VDC
I.S. Power Supply
+
–
+V
KP8
KP7
KP6
KP5
KP4
KP2
KP1
VCA Remote Keypad
Terminals
VCA I.S. Keypad
Interface Terminals
Figure 6 - I.S. keypad interface wiring to VCA Remote Keypad Module (E08985)
Содержание VAA
Страница 73: ...VOICECOM USER MANUAL ISSUE 4 77 APPENDIX G I S Approvals ...
Страница 74: ...VOICECOM USER MANUAL ISSUE 4 78 ...
Страница 75: ...VOICECOM USER MANUAL ISSUE 4 79 ...
Страница 76: ...VOICECOM USER MANUAL ISSUE 4 80 ...
Страница 77: ...VOICECOM USER MANUAL ISSUE 4 81 ...
Страница 78: ...VOICECOM USER MANUAL ISSUE 4 82 ...
Страница 79: ...VOICECOM USER MANUAL ISSUE 4 83 ...
Страница 80: ...VOICECOM USER MANUAL ISSUE 4 84 ...
Страница 81: ...VOICECOM USER MANUAL ISSUE 4 85 ...