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Question: We have the non-upgradeable version (C1901J) recorder and we now have a need for the missing relay for an alarm. Do we need to buy the upgradeable version (C1911J) to replace our existing recorder or is there a way to modify or upgrade this unit with the relay output?

Answer: Since the C1901J is considered a non-upgradeable basic single pen recorder, the "official" factory answer would be: Yes, a new upgradable recorder (C1911J) is required if use of a relay output is required.

The truth is that we are able to upgrade your existing unit. In fact, the missing relay circuit is very small, and anyone with excellent soldering skills can populate the parts required to add the relay output circuit.

The upgrade consists of two parts:
1) The physical components that need to be soldered in place
2) Manipulating the instruments software to acknowledge the new relay circuit.

PART 1:
The relay circuit consists of seven (7) components and they are located in the bottom left corner of the Processor Board next to the Terminal Block (See photos below).

Relay & related parts unpopulated Standard factory version (C1901J)	Relay & related parts populated Modified version (XC1901J)

 

The following table lists the specific parts required:

Board Designator	Description	Generic Part Number	ABB Part Number
D5	Diode: 75V	1N4448	B8219
IC4	IC - Resistor / Cap	PMR210MB5220M	B9303
IC5	IC - Resistor / Cap	PMR210MB5220M	B9303
R14	Resistor	1kΩ, 1/4W, 5%	B6253
R15	Resistor	100kΩ, 1/4W, 5%	B6518
RL1	Relay (Schrack)	RY610005	B10842
TR4	Transistor: NPN	BC337	B7608

 

PART 2:
Since the 1901J was meant as a bare bones recorder with basically no options available. The software will not allow you access to much of the program that is available with the standard 1911J model.
In order to get around this, we must re-commission the unit to a 1911J model. This will allow access to the programming of the relay.

The following detailed steps will help you re-commission the instrument.

Please keep in mind that this procedure is NOT in any published manuals. This is a "factory" only procedure. Follow these steps carefully, for you may accidentally render your unit useless if you change any other parameters.

 

Detailed Steps:
1)	Turn off the Security Link LK3, two pin jumper installed in lower position. (Processor Board: Top, Center)
2)	Press until you see
3)	Press first and hold, then press . You will see
4)	Press until you see
5)	Turn on the Security Link LK3, two pin jumper installed in upper position. (Processor Board: Top, Center)
6)	Press until you see
7)	Press once and you will see .
8)	Press once and you will see .
9)	Press until you see . From here, we need to now reconfigure the recorder to a 1911J.
10)	Turn off the Security Link LK3, two pin jumper installed in lower position. (Processor Board: Top, Center)
11)	Press until you see
12)	Press once and you will see a screen like , now press either or until you see
13)	Press until you see , then press until you see . The unit is now configured as a 1911J recorder. The next few steps are needed to set the units software to a set standard, to eliminate any possible programming issues.
14)	Press until you see
15)	Press once, you will see .
16)	Press once, if you have 2101 firmware, you will see .
17)	Press once, you will see , followed by .
18)	From here, you can simply exit the program by either recyling power, or by pressing   until you see , then press until you see (Your process variable display).
19)	Turn on the Security Link LK3, two pin jumper installed in upper position. (Processor Board: Top, Center)

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