DPR-05 relay is a three-phase (line to neutral)
voltage asymmetry protection relay designed for
electric motor protection.
It offers adjustable asymmetry limit together with
adjustable trip and reset delays. The unit has also
phase sequence protection, phase failure and
phase overvoltage protections.
The asymmetry limit can be adjusted or disabled
via trimmers on the front panel of the device.
Delay timers are adjusted through related
trimmers.
ASYMMETRY PROTECTION
The maximum allowed asymmetry limit is
adjusted between 5 to 15% with the ASYM
trimmer. If the voltage unbalance (asymmetry)
goes over the set asymmetry limit, the
”
ASM
” led
turns on and the adjusted Delay timer starts to
count. If the fault condition disappears before the
Delay timer expires, then the
”
ASM
” led turns off.
If the fault condition persists until the expiration of
the Delay timer, the relay output is deactivated
and the “
OUT
” led turns off.
The asymmetry is defined with below formula:
Asymmetry % = [(Vmax
LN
- Vmin
LN
) / 230V] x 100
When the measured asymmetry is again below
the adjusted limit, the
”
ASM
” led turns off and the
adjusted Reset Delay timer starts to count. When
the timer is expired, the relay output is activated
and the
”
OUT
” led turns on.
PHASE FAILURE PROTECTION
If the voltage of any phase falls below 50% of the
nominal value, then
”
ASM
” led turns on and
immediately the relay output is deactivated and
the “
OUT
” led turns off.
OVERVOLTAGE PROTECTION
If the voltage of any phase goes 50% above the
nominal value, then
”
ASM
” led turns on and
immediately the relay output is deactivated and
the “
OUT
” led turns off.
PHASE SEQUENCE PROTECTION
If the phase sequence is reversed, the
“
SEQ
” led
starts to flash, the relay output is deactivated and
the “
OUT
” led turns off.
* Electrical equipment should be installed only by
qualified specialist. No responsibility is assured by
the manufacturer or any of its subsidiaries for any
consequences resulting from the non-compliance
to these instructions.
* Check the unit for cracks and damages due to
transportation. Do not install damaged equipment.
* Do not open the unit. There is no serviceable
parts inside.
* Fuses of fast type (FF) with a maximum rating of
6A must be connected to phase voltage inputs, in
close proximity of the unit.
* Disconnect all power before working on
equipment.
* When the unit is connected to the network do
not touch terminals.
* Any electrical parameter applied to the device
must be in the range specified in the user manual.
* Do not try to clean the device with solvent or the
like. Only clean with a dump cloth.
* Do not allow water to come inside the unit.
* Verify correct terminal connections before
applying power.
* Only for DIN rail mounting.
Before installation:
Read this manual carefully, determine the
correct connection diagram.
Make sure to use adequate fuses.
Do not subject the unit to water spill.
Below conditions may damage the device:
Incorrect connections.
Incorrect power supply voltage.
Overload or short circuit at relay outputs
Power supply frequency out of specified limits
Do not install the unit close to high
electromagnetic noise emitting devices like
contactors, high current busbars, switchmode
power supplies and the like. Although the unit
is protected against electromagnetic
disturbances, excessive disturbance can affect
the operation and measurement precision.
Use adequate cable section, at least 0.75mm
2
(AWG18).
OPERATION
Do not overload relay
outputs. Use extra
contactors if required.
ELECTRICAL INSTALLATION
PRE-INSTALLATION
SAFETY NOTICE
Failure to follow below
instructions will result in
death or serious injury
DPR-05 VOLTAGE
ASYMMETRY
PROTECTION RELAY
(LINE TO NEUTRAL)
