Honeywell ControLinks R7999C Manual page 14

R7999C CONTROLINKS™ CONTROLLER

Fault/

Blink

Code

91

The 4 to 20 mA firing rate input is below 3 mA, Out of Range—Low. (Actuators

return to or remain at the minimum modulation point with the alarm on; the

control remains operational only to the extent that Minimum Modulation

firing operation is allowed.)

92

The manual potentiometer rate input is higher than an allowable range, i.e.,

Out of Range—High. (The actuators move to the maximum modulation point

with alarm ON, control will remain operable, yet when MANUAL MODE is

selected, maximum modulation and alarm output shall occur.) Auto mode

operation is not affected.

93

The auxiliary 4-20 mA input must be below 3.0 mA when configured for use.

(The actuators return or remain at the minimum modulation point with alarm

ON, the control will remain operable only to the extent that Minimum

Modulation firing operation is allowed.)

94

After LCO is set by the R7999C, the Burner Control must provide a Lightoff or

Purge request within 20 seconds. (Controller remains in a processing demand

condition indefinitely waiting for valid inputs on the LF, MV and HF inputs; the

alarm is sounded after the 20-second period expires.)

a

It is possible that a random external electrical noise has caused a fault checking algorithm to be detected. Resetting the

control will allow recalculation of the fault and, if it is not a hard failure, the device will continue to operate. If the condition

will not clear, the device must be replaced.

b

Check ac waveform; severe noise on ac lines can corrupt sampling of ac signals.

c

Verify actuator total resistance and wiper measurements; check the ability of the actuator to travel full stroke using the

manual override buttons in the actuator. Verify input power to the actuator. if actuator is not functioning, replace the actu-

ator.

d

Conditional Alarm. Causes the alarm output to be energized, the system may still be operating but requires attention in

order to modulate or to proceed with the light off sequence. The actuators would be positioned at lightoff point, minimum

modulation point or maximum modulation point, dependent on what the particular fault is and when the fault is intro-

duced, relative to the R7999C ControLinks operating state.

Wiring Checkout and Error Faults

The ZM7999 commissioning, a S7999 touchscreen display,

or other monitoring tools provide an effective means of an

indirect status reading of all line voltage inputs and

outputs. Use these tools to confirm wiring. The

commissioning tool and monitoring tool environments

require that a single fuel select input to be active before

proceeding with communications between the tool and

controller. Further, simultaneous HF and LF commands

from the burner are not allowed and will preclude

communications with the tools.

The act of bringing actuators successfully "on-line" verifies

the initial wiring between the controller and actuators. See

error codes 71 through 74 and/or 54 through 57 for

details. Other wiring problems occurring between the

actuators and controller, after commissioning, may be

annunciated by fault codes 41 through 53 or 61,67,68,69

or 82 through 86.

Burner control wiring interface problems are annunciated

by fault codes 13, 14, 15, 34, 37.

The Q7999 Universal Subbase is partitioned into a line

voltage section and a low voltage section. Utilize shielded

cabling on all low voltage wiring. Keep the earth ground

cable shield short as possible for all interface wiring as

illustrated in Fig. 2.

32-00081EF—01

Table 7. Fault Listings and Descriptions. (Continued)

Description

14

Check CmA+-input (Terminals 39 and 40) for proper operation polarity and

range. The input must be within 3.0 mA to 21.0 mA. The voltage at this

terminal must be within 0.7 to 5.0 Vdc, respectively.

Conditional Alarm—Alarm output is energized; controller continues to run.

The Manual potentiometer is out of range high. Make sure a 5000 ohm

(±10%) potentiometer is being used and wiring to it is correct. Shielded cable

is recommended.

Conditional Alarm—Alarm output is energized; controller continues to run.

Check XmA+- input (Terminals 37and 38) for proper operation polarity and

range. The input must be within 3.0 mA to 21.0 mA. The voltage at this

terminal must be within 0.7 to 5.0 Vdc respectively.

Conditional Alarm—Alarm output is energized; controller continues to run.

Check burner control interface wiring and burner control operation

(Terminals 10, 11, 12). The R7999C is waiting for a command via these

terminals.

Conditional Alarm—Alarm output is energized; controller continues to run.

Replacing an ML Actuator

When the ML7999C Actuator is identified for replacement,

you should do the following BEFORE the actuator is

removed:

1. Use the ZM software or the S7999 Touchscreen Dis-

play and make sure the burner configuration has

been saved.

2. Go into the Commission and go to the Actuator that

needs to be replaced, and Unlock at least one of the

endpoints.

3. Remove the wiring and actuator and install the

replacement without tightening the setscrews (as

described in the ML instructions).

4. You can now go back through the commission proce-

dure to set up the new actuator by entering the serial

number and establish the end points.

5. Once entered, you can download the existing curve

and verify the curve firing points.

If the motor had been removed and is now added to the

R7999C system, the R7999C will lockout because the

motor serial numbers won't match.

1. Make sure the system is in "Standby"

2. Go to the replaced actuator and remove the cover,

above the wiring about the center of the motor is a

Red connector. Carefully disconnect it.

3. Go back into the Commission mode of the ZM soft-

ware or S7999 Touchscreen display and enter your

password, but DO NOT press enter.

Corrective Action

d

d

d