FEATURE |
VCM-E |
VCM-C |
| Local Display |
Switch position provides
continuous display of either:
Peak Shaft Voltage *,
Peak Brush Current,
Average Brush Current or
Power/Alarm Check. |
Push button to display
either:
Peak Shaft Voltage **(non-grounded)
Peak Brush Current,
Average Brush Current or
Battery Voltage
(Selectable from rotary switch) |
Transmitter
(Make range and option selections prior to installation.) |
Remote signals,
4-20 mA, proportional to:
1. Brush Current (Peak or Average)
2. Shaft Voltage (Peak) |
Not available. |
Alarms
(Make limit settings prior to installation.) |
Dry contact closures, or
20 volts applied for:
1. Less than Minimum Brush Current Setting.
2. Greater than Maximum Shaft Voltage Setting
(Optional Local or Remote Audible Alarms.) |
Signals exceeding VCM
range are indicated by the lighted overload LED, or display of 1_ _ _ when the
push-to-read button is pressed |
| Input Power
Requirement |
115 Volts, 20 Volt Amps
A.C.
(The VCM-E electronic circuitry requires 24 V D.C., which is developed
from the input power.) |
9 Volts D.C.
(9 volt transistor battery, which is connected only when pressing the
push-to-read button, will last for the shelf life of the battery.) |
| Packaging Options
|
Waterproof (Model
VCM-EN)
Explosion Proof (Model VCM-EE) |
Waterproof (Model
VCM-CN)
Explosion Proof (Model VCM-CE) |
| Single Brush
Option/Use |
Yes, can be used;
however, only current measurements will be possible. |
Yes, originally the
single brush design was for units under 50 MW. |
| Explosion-Proof
Installation |
The VCM-E is available for use in explosion proof or non-explosion proof environments.
|
CENELEC EExd IIB+H2
T6 Class Approved units are available. Standard
explosion proof (VCM-CE) and non-explosion proof (VCM-CN) are available.
|
| Spark-Free
Performance |
Brush and Shunt remain connected. |
Ground current sparking can
be contained within the explosion-proof enclosure during brush removal, maintenance and
replacement. |
| Mounting Requirements
|
The current shunt must be mounted in close proximity to the brush.
For convenience, the VCM-E should be installed for easy access to its display. The
transmitted 4-20 ma signals and alarm indications can be distributed to any location.
|
Good for RMS currents under 3
amperes. A separate current shunt is not required. The VCM-C is installed in series with the
brush requiring it be mounted in the immediate vicinity of the brush where the push
button, as well as the LCD display, are readily accessible. |
| Type of Brush Required |
Any type of insulated brush
may be used. VCM-E optimum performance results when used with dependable shaft grounding
and voltage sensing brushes. |
Any type of insulated brush may
be used. VCM-C optimum performance is obtained when used with a dependable shaft grounding
brush. |
