MV-32/64 Multiviewer
www.snellgroup.com
Installation
Issue 1 Rev 11
Page 24
© 2014 Snell Limited
3.7.1 25 Way D-Type CN500 Pin Assignment
The 25 way D-Type Male Shell connector supplied must be fitted to the CN500 socket on the
rear of the MV-Power for the DC output to be active. The supplied CN500 connector can be
used to monitor and control the MV-Power backup power supply from external devices but is
not normally used in this way. Details are given in Table 5. and Table 6. if control and
monitoring is required.
The following table gives the pin assignments for the 25 Way D-Type male shell connector.
The supplied 25 way D-type shell male connector is pre-wired to ensure that any power
supply modules fitted in the MV-Power will be active. If this is misplaced another can be
produced by connecting pin 21 to pin 1, to pin 8 and to pin 15 (see Table 6. for details).
Fig 12. CN500 Connector 25 Way D-Type Shell Male.
Pin Number
Signal
Pin Number
Signal
1
On/Off - A
14
CS
2
AC OK - A
15
On/Off - C
3
DC OK - A
16
AC OK - C
4
V Trim - A
17
DC OK - C
5
T Alarm - A
18
V Trim - C
6
+5V - Aux
19
T Alarm - C
7
GND Aux
20
+S
8
On/Off - B
21
-S
9
AC OK - B
22
+V
10
DC OK - B
23
NC
11
V Trim - B
24
NC
12
T Alarm - B
25
-V
13
NC
Table 5.
CN500 Connector 25 Way D-Type Male Shell.
Pins
Function
Description
1, 8, 15
On/Off
Each unit can separately turn the output on and off by electrical or
dry contact between ON/OFF A, B, C (pin 1, 8, 15) and -S (pin 21)
Short = On,
Open = Off
2, 9, 16
AC OK
Not Normally Used
High when the input Voltage is
≥
82Vrms ±4V otherwise Low
3, 10, 17
DC OK
Not Normally Used
High when the output Voltage is
≥
19.2VDC ±1.2V otherwise Low
4, 11, 18
V Trim
Not Normally Used
Connection for output Voltage trimming. The Voltage can be
trimmed within its defined range
5, 12, 19
T Alarm
Not Normally Used
High = When the temperature is within the safe limits of operation
Low = 10’C below the thermal shutdown limit
Table 6.
CN500 Connector Pin Functions.
13
1
14
25
