Pin No.
Code
Description
1
N(-)
Neutral Power / DC-Power supply
2
ALM2 C
Alarm Relay 2 Common
3
ALM2 NO
Alarm Relay 2 Normally Open
4
ALM2 NC
Alarm Relay 2 Normally Closed
5
(+)
DC + Power supply (9-36 VDC)
6
L
Line Power (90-240 VAC)
7
ALM1 C
Alarm Relay 1 Common
8
ALM1 NO
Alarm Relay 1 Normally Open
9
ALM1 NC
Alarm Relay 1 Normally Closed
Wiring Instructions
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Section 4.2 - Connecting Power
Table 2 - 9-Pin Input Power/Relay Wiring Summary
Connect the main power connections to pins 4 and 9 (AC Power) or pins 5 (+) and 9
(-) (DC Power) of the 9pin power / output connector as shown in
Figure 3
.
NC
L
ALM1
NO C
(+)
N
(-)
NC
ALM2
NO C
1
9
N
L
SW
Fuse
SW
+
-
Or
DC POWER OPTION
90 – 240Vac
9 – 36Vdc
AC POWER
Fuse
Figure 3 - Main Power Connections
For the low-voltage power option, maintain the same degree of protection as the
standard high-voltage input power units (90–240 Vac) by using a Safety Agency
Approved DC source with the same Overvoltage Category and pollution degree as
the AC model.
The Safety European Standard EN61010-1 for measurement, control, and laboratory
equipment requires that fuses must be specified based on IEC127. This standard
specifies the letter code “T” for a Time-lag fuse.
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