Bray 70 Series SERVO PRO User Manual

Page 20

BRAY Series 70 Servo Pro

Operation and Maintenance Manual

BRAY Series 70 Servo Pro

Operation and Maintenance Manual

6.0 t

roublesHooting

uide

The Servo Pro is easy to configure and operate, but

if problems do occur, the following guide can assist

troubleshooting.

The first step is to observe the Power LED to verify that

the proper electrical power has been connected. Then

observe the Status LED and note the Flash Code. If it

is not the normal green heartbeat indication, refer to the

Status LED Flash Code chart in Section 4.4.

6.1 t

roublesHooting

xamPle

The following example demonstrates a typical

troubleshooting process.

Assume these starting conditions:

1. The handwheel is engaged (pulled away from the

actuator).

2. The Servo Pro has never been calibrated.

3. The Servo Pro has been configured to accept a

command signal of 0-10 VDC

4. The command signal from the process controller is

actually 4-20 mA DC, and it is connected in reverse

polarity – the positive conductor is connected to

INPUT (-) and the negative conductor is connected

to INPUT (+)

The Power LED is solid green indicating the power is

properly applied.

The Status LED is flashing a single-red error pattern.

The Status LED Flash Code in Section 4.4 indicates

this is because the handwheel is engaged, preventing

the Servo Pro from moving the actuator motor. This

error condition can be corrected by disengaging the

handwheel (pushing it toward the actuator.)

Now the Status LED is flashing a two-red Flash Code

error. Section 4.4 indicates that the Servo Pro is not

receiving a proper command signal. This could be

caused by various issues – in this case, Configuration

switches 1, 2 and 3 must be set to accept the 4-20

mA DC command signal AND the polarity of the wiring

must be corrected - the positive conductor must be

connected to INPUT (+) and the negative conductor

must be connected to INPUT (-). If only one correction

is made, the two-red Flash Code will continue. BOTH

of these corrections must be made to establish the

proper command signal and clear the two-red Flash

Code error.

The Status LED is now flashing the two-green Flash

Code, indicating that the default calibration values have

been loaded. This will move the actuator in the proper

general direction (increasing the command signal will

power the motor open and decreasing the command

signal will power the motor closed) but the Servo

Pro has not been exactly calibrated to this particular

actuator. This advisory can be cleared by performing

the Calibration Procedure in Section 3.1.

After the Calibration Procedure has completed

successfully, the Status LED is flashing the green

heartbeat pattern and is ready for service.