A5. Voltage Measurement And Power Supply Connection - Hitachi Abb Rvt Installation Und Betriebsanleitung

One of the eight T probes temp > its max.
protection level
THDV > THDV max prot.
External input activated
(*) For more information regarding the Reset-Delay and ON-delay parameters, a complete description is available in
paragraph 4.3.1.1.

A5. Voltage measurement and power supply connection

This appendix provides a practical way to connect voltage measurement to the RVT when it is the same as the RVT
voltage supply.
Description
As shown on the Figure 57, the RVT has two terminals for its power supply and three other terminals for its voltage
measurement input.
The RVT does not use its power supply voltage to perform the voltage measurement. Voltage measurement is per-
formed only through the dedicated voltage measurement input terminals.
If the RVT auxiliary power supply and the voltage measurement signal are from the same source, a bridge between
the corresponding terminals can be done:
Bridge connection (practical proposal)
Due to limited space, it is not possible to insert two cables in a single slot. Hence alternate methods may be used to
connect two wires to a common terminal.
Several practical ways exist to perform this connection properly. One of these solutions is described on
STATUS
Approved
- Opens alarm relay immediately
(external optional probe T1-8)
- Resumes normal behavior after a time equal to ON-Delay(*)
- Opens alarm relay immediately.
- Resumes normal behavior after a time equal to ON-Delay(*).
Anti-hunting protection:
If the same event occurs within one hour, the RVT will resume nor-
mal operation after a time equal to 2x ON-Delay.
If the same event occurs again within one hour, the restart time will
be doubled to 4 x ON-Delay, and so on up to a maximum of one
hour.
This rule allows a hunting effect due to resonance phenomena to be
avoided.
- Opens alarm relay immediately.
- Restart normal behavior after a time equal to ON-Delay(*).
Figure 57: Terminals
SECURITY LEVEL
Public
PO WE R FACTO R CON TR O LL ER RV T
DOCUMENT ID
9AKK107045A9645
Figure 58.
REV. LANG. PAGE
D en 79/542
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