Bender VMD461 Quick Start Manual

Quickstart
VMD461 with CD440
Multifunctional voltage relay
Intended use
The multifunctional voltage monitoring relay VMD461 monitors frequen-
cies, undervoltages and overvoltages in DC, AC and 3(N)AC systems. The
phase voltages and/or line-to-line voltages are measured as r.m.s. value
and are continuously shown on the device display. The measured value re-
quired to trigger the alarm relay is stored. The VMD461 features additional
measuring functions for:
ROCOF df/dt
 
Vector shift monitoring
 
Unbalance monitoring
 
Phase sequence monitoring
 
The corresponding ANSI codes for all available measuring functions are provided.
Configurable delay times allow considering special installation-specific properties (e.g. device-specific
start-up procedures). The VMD461 requires an external supply voltage.
The optional use of a CD440 coupling device extends the voltage range that can be monitored to DC/
3AC 1200 V or 1AC/3NAC 690 V. Any other use than that described in this manual is regarded as impro-
per. The quickstart does not replace the manual of the device. Download:
Safety instruction
Danger of electrocution due to electric shock!
Touching live parts of the system carries the risk of:
 
DANGER
 
 
Before installing and connecting the device, make sure that the installation has
been de-energised. Observe the rules for working on electrical installations.
Dimension diagrams VMD461 (left) und CD440 (right) in mm
74
VMD461_D00314_00_Q_XXEN/10.2018
An electric shock
Damage to the electrical installation
Destruction of the device
108
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EN
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