Related Products:

EGMA-004, EGMA-005, EGMA-006, EGMA-007, EGMA-008, EGMA-013, EGMA-015, EGMA-016, EGMA-019

Related Documents:

CMS EZDP-2020 and EZDP-2038

Type:

Technical information

Keywords/Labels:

Premium Monitoring System, Shaft Voltage, Ground Current

Summary:

Contains technical information in tables detailing shaft voltage, ground current, channel 6 , and channel 7 output values.

DCS Programming Interpreting Output Values

The 4-20 mA outputs are intended to be used with a plant DCS. Refer to the following four tables when programming.

Table 2. Shaft Voltage Average Output Values

Shaft Voltage (V)

Conditioned Voltage (V)

4-20 mA Output

-100

-10

4

-50

-5

8

0

0

12

50

5

16

100

10

20


Table 3. Shaft Voltage Zero-to-Peak Output Values

Zero-to-Peak Voltage (V)

Conditioned Voltage (V)

4-20 mA Output

0

0

4

25

2.5

8

50

5

12

75

7.5

16

100

10

20


Table 4. Ground Current Average Output Values

Ground Current (A)

Conditioned Voltage (V)

4-20 mA Output

-50

-10

4

-25

-5

8

0

0

12

25

5

16

50

10

20


Table 5. Ground Current Zero-to-Peak Output Values

Zero-to-Peak Current (A)

Conditioned Voltage (V)

4-20 mA Output

0

0

4

12.5

1.25

8

25

2.5

12

37.5

3.75

16

50

5

20


For EZDP-2038:

In the following table, the shaded cells apply only when the optional Exciter Shaft Grounding Assembly (SGA) Voltage Assembly is installed.

Table 6. Channel 6—Rope and Unit Status

Range Low

mA Output

Range High

Condition

Description or Recommended Action

0

to

3.9

Not a valid output level.

4–20 mA line failure or monitoring powered off.

3.9

4

4.5

Monitoring paused. Grounding current and shaft voltage both below minimal threshold.

Alert: Generator offline. Not a fault. Premium Monitoring System paused. Monitoring resumes automatically when the generator resumes operation.

This status should display only if the generator is offline. If the generator is online, notify Cutsforth of the error.

4.5

5

5.5

Normal, generator online.

Normal operation. No alarms indicated.

NA

#1 SGA Ground rope.

#2 SGA Metering rope.

#3 SGA Exciter Metering rope.

6-12 mA: Rope status array. All else: Unit Status.

5.5

6

6.5

#1 SGA Stepped up.

#2 SGA Normal.

#3 SGA Normal.

Alarm # 1 fault. SGA ground rope.

6.5

7

7.5

#1 SGA Normal.

#2 SGA Stepped up.

#3 SGA Normal.

Alarm # 2 fault. SGA metering rope.

7.5

8

8.5

#1 SGA Normal.

#2 SGA Normal.

#3 SGA Stepped up.

Alarm #3 fault. SCA exciter metering rope.

8.5

9

9.5

#1 SGA Stepped up.

#2 SGA Stepped up.

#3 SGA Normal.

Alarm #1 & #2: SGA ground and metering ropes.

9.5

10

10.5

#1 SGA Stepped up.

#2 SGA Normal.

#3 SGA Stepped up.

Alarm #1 & #3: SGA ground and SCA metering ropes.

10.5

11

11.5

#1 SGA Normal.

#2 SGA Stepped up.

#3 SGA Stepped up.

Alarm #2 & #3: SGA metering, SCA metering ropes.

11.5

12

12.5

#1 SGA Stepped up.

#2 SGA Stepped up.

#3 SGA Stepped up.

Alarm #1, #2, & #3: SGA ground, metering, and SCA metering ropes.

12.5

13

13.5

Storage reaching full capacity.

Alarm: Download waveforms stored on the Premium Monitoring System. After confirming download was successful, delete the files on the monitoring system using the Premium Monitoring System File Manager. THe monitoring system will lock up if storage reaches full capacity.

17.5

20

20.1

Grounding loss. Ground current (Below minimal threshold) and shaft voltage (stepped up).

Warning. Probable loss of grounding. Urgent status. Inspect grounding hardware and confirm measurements at remote meter points.


For EZDP-2020:

If the external LED option is installed, any channel 6 output that is listed below as an alarm or warning causes the external LED indicator on channel 7 to flash until the condition is cleared.

Table 7. Channel 6—Rope and Unit Status

Range Low

mA Output

Range High

Condition

Description or

Recommended Action

0

to

3.9

Not a valid output level.

4–20 mA line failure or monitoring powered off.

3.9

4

4.5

Monitoring paused. Grounding current and shaft voltage both below minimal threshold.

Alert: Generator offline. Not a fault. CMS paused. Monitoring resumes automatically when the generator resumes operation.

This status should display only if the generator is offline. If the generator is online, notify Cutsforth of the error.

4.5

5

5.5

Normal, generator online.

Normal operation. No alarms indicated.

NA

#1 SGA Ground rope.

#2 SGA Metering rope.

6-12 mA: Rope status array. All else: Unit Status.

5.5

6

6.5

#1 SGA Stepped up.

#2 SGA Normal.

Alarm # 1 fault. SGA ground rope.

6.5

7

7.5

#1 SGA Normal.

#2 SGA Stepped up.

Alarm # 2 fault. SGA metering rope.

8.5

9

9.5

#1 SGA Stepped up.

#2 SGA Stepped up.

Alarm #1 & #2: SGA ground and metering ropes.

12.5

13

13.5

Storage reaching full capacity.

Alarm: Download waveforms stored on the CMS. After confirming download was successful, delete the files on the CMS using the CMS File Manager. CMS will lock up if storage reaches full capacity.

17.5

20

20.1

Grounding loss. Ground current (Below minimal threshold) and shaft voltage (stepped up).

Warning. Probable loss of grounding. Urgent status. Inspect grounding hardware and confirm measurements at remote meter points.


Channel 7 controls the external LED, when installed. Any of the following alarms, warnings, or status conditions raise the channel 7 output to 20 mA, which triggers a current-driven relay to supply 24 V DC power to the LED:

  • Rope fault

  • Operator-set threshold is crossed

  • Grounding lost

  • Storage full condition

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