H25-IR PRO Instruction Manual
Wiring
P/N: 3015-5678 Rev 6
31
•
Each relay may be connected as normally open (NO) or normally closed (NC).
•
The relay contacts are rated 2 A at 250 VAC (inductive) and 5 A at 250 VAC (resistive).
•
Power for the external alarm devices is supplied from an external power source.
•
Jumper the “neutral” line of an external power source to the “common” terminals on the relay connector.
•
Connect one end of the alarm device to the appropriate terminal of the desired relay (NO or NC).
•
The other end of the alarm device is connected to the other leg of the external power source. For protection, install
an in-line fuse of the appropriate size and design for the external alarm device being used.
NOTE:
Be sure to configure the relays in the ADVANCED SETUP menu. Refer to Relay Settings on page 61.
NOTE:
Ensure the circuit load does not exceed the relay ratings.
4.3. 4-20mA Current Loop Connection
An external 4
-
20 mA monitoring device (e.g., chart recorder) can be connected to the H25-IR PRO using a shielded-twisted-
pair cable. Locate the 4
-
20 mA connector on the rear of the unit, and then remove the resistor or shorting wire from its
terminals.
IMPORTANT:
The monitoring device must be isolated from ground (i.e., a
floating
ground). For non-
isolated equipment, a loop-isolator must be between the H25-IR PRO and the monitoring device.
Bacharach recommends DataForth model DSCL21 at www.dataforth.com.
NOTE:
A shorting wire must be connected to the 4–20 mA connector if no external monitoring device is used.
Failure to install this resistor will cause a “Loop Open Error” to occur.
Secure the wire leads from the external monitoring device to the connector as shown in the diagram below, making sure that
the polarity at this connector matches the wiring at the monitoring device.
Figure 4-2. 4-20mA Loop Connector Used
CAUTION:
Never apply power to the 4–20 mA Loop Connector from an external power supply. In addition,
co
nnect only a load resistor or a
floating
measurement device.
NOTE:
Wiring to the monitoring device should consist of 24 AWG, twisted pair up to 2000 feet in length.
Summary of Contents for H25-IR PRO
Page 6: ...H25 IR PRO Instruction Manual vi P N 3015 5678 Rev 6 ...
Page 8: ...H25 IR PRO Instruction Manual viii P N 3015 5678 Rev 6 ...
Page 39: ...H25 IR PRO Instruction Manual Menu System Overview P N 3015 5678 Rev 6 29 ...
Page 109: ...H25 IR PRO Instruction Manual Maintenance P N 3015 5678 Rev 6 99 ...
Page 120: ...H25 IR PRO Instruction Manual Declaration of Conformity P N 3015 5678 Rev 6 110 ...