Time Delay Adjustment - Westinghouse CVR-1 Instructions Manual

Page 10
90R CONTACT
ASSEM. HANDLE
90 R CONTACT ASSEM.
MAGNET TIME
MULTIPLIER SCALE
MAGNET ASSEM.
MOUNTING SCREWS
while lights Ro and Lo indicate operation of
the motor control relay contactsAR andAL.
With the switch in the " CAL" position,
the operation of 90R and 90L contacts is
indicated by lights Rp and Lp.
With the switch on "AUTO" position the
relay functions in response to applied volt­
age as it would under fully automatic regu­
lation. Operations are indicated by all four
lights.
With the switch on " MAN" position the
raise and lower switches control the motor
control relays. Rp and Lp now indicate
closing of the raise and lower pushbuttons.
Ro and Lo still indicate operation of AR and
AL contacts.
General operating data for the relay on
60 cycles is as follows:
7-
Fig. Close-up of CVR-1 Relay Adjustments
Burden of the potential
Separate R and
100% load compensation current
Burden on the current circuit at 100%

Time Delay Adjustment

The inverse time delay characteristic of the
CVR - 1 relay enables it to maintain regulated
voltage within close tolerance.
shows
factor of 2.4.
relay
and Figure 10 shows a curve of relay per­
formance when adjusted for a damping factor
of one.
least
amount of time delay that precedes the ini­
tial operation of the tap changer on a change
circuit at 120 volts - -
with auxiliary relays energized
X
compensation
load - - - - - - - - - - - - - - -
the relay adjusted for a damping
Figure 9 shows a curve of
adjustment versus damping factors
As can be seen from Figure 10, at
three different factors
90 L CONTACT
ASSEM. HANDLE
VOLTAGE SCALE
DAMPING MAGNET
a SCALE
KEEPER
LOCKI NG
SCREW
DAMPING
MAGNET
SWITCH
BASE
- - - - - lOVA
-
9V
3 A
24 volts
-
-
.2 amps
VA
13
7
Figure
control the
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