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The UFR1001E has a passive island grid detection (voltage and frequency).
A single-phase or multi-phase interruption of the EZE supply line is not suitable for checking the island grid detection using a passive method.

Although VDE-AR-N 4110:2018-11 does not require single-fault safety, the UFR1001E is single-fault safe due to its 2-channel design. (as required by VDE-AR-N 4105:2018-11).
Both channels constantly monitor each other. In the event of a detected fault (even internal), both output relays drop out and do not switch back on automatically.
Should one of the two output relays stick, the other output relay still disconnects. (Series connection)
Thus, the output signal of the series-connected NOC can be used as a life contact.
Since VDE-AR-N 4110:2018-11 does not require single-fault safety, K1 can also be used to disconnect the tie switch and K2 as a life contact.
Certificates and technical information

The fallback ratio is the quotient between the value at which an overshoot is detected and dAL starts and the value at which dAL stops running if it falls below again before dAL expires.

The component certificate explicitly confirms the fallback ratios <2%. (1.02 for undervoltage/underfrequency; 0.98 for overvoltage/overfrequency).

Nevertheless, the drop-out ratios can be checked as follows:
- Set dAL to a longer time (e.g. 5.00s).
- exceed/fall below limit (e.g. at U< = 0.8 * Un to 0.78 * Un)
- back again just into the good range (in the example to 0.81 * Un)
- wait min. 5.00s (>= set dAL)
If no triggering takes place, the drop-out ratio is <2%.

If feedback contact monitoring is activated ("trEL" not equal to "oFF"), the UFR1001E also detects failed switch-on attempts. (feedback signal missing)
If the UFR1001E should not make any further closing attempts (e.g. circuit-breaker with thermal or overcurrent monitoring), this can be prevented by a jumper between terminal E1 / E2 and the setting "vSr" = "Y1Y2". As a result, the closing operations are no longer monitored,
Switch-offs, on the other hand, are.

The entire settings and the simulation mode can be locked.
If the LED lights up, the UFR1001E is locked.
If an attempt is made to change a setting in the locked state, "LoC" is displayed for 3s.
Setting procedure Sealing/locking ON (OFF):
- Remove seal if present (authorized person only)
- Switch on the control voltage on the UFR1001E.
- Slightly lift the pushbutton cover and rotate it by 180
- Press the button very hard on the button cover (LED starts flashing)
keep pressed until - LED lights up green
For sealing, a "standard" seal can be used, e.g. for electricity meters.

The drop-out ratio is the ratio between the drop-out value and the pickup value. Here, the excitation value is the value at which reaching the limit value is detected and the response delay time dAL starts.
The release value is the value at which "dAL"(alarm delay) stops running if it is reached before "dAL" has elapsed.
For easy measurement of the fallback ratio, activate the "ruEF" function.
Function while "ruEF" is active: When limit value is reached (="dAL" starts) → relay OFF. When the
fallback value is reached (= "dAL" aborted) → relay ON.
Drop-out ratios can only be checked for U>>, U>, U<, U<< (f, zero-sequence voltage and 10min mean value
not). To test e.g. U>>, U> must be switched "off".
Under the menu item "rEL" →"doFA" "ruEF" can be selected. The "Time" LED flashes when "rvEF" is active.
To switch off the function, call up "rEL" → "doFA" → All and confirm with "Set". Here, the switch-back delay time "doF" for all alarms can be set together to the values required by the network operator. After 600 s, the function switches off automatically.

Operating manual

Is a test terminal strip required for the UFR1001E and how must it be designed?

A test disconnect terminal strip or test disconnect terminals have been mandatory for protective devices according to VDE-AR-N 4110:2018-11 and BDEW since 2008. (See e.g. VDE 4110 -> Interfaces for protective function tests).

To carry out a protection test, we recommend routing the following connections on the UFR1001E via a test disconnect terminal:
A1 + A2 (control voltage Us)
11 + 12 +14 (relay K1); 21 + 22 +24 (relay K2)
Y0 + Y1 + Y2 (feedback contacts, or better use a separate signal contact)

The following terminals, for example, are suitable:
- Phoenix Contact URTK6 with safety test socket 4mm (on both sides!) and disconnect slider.
- Wago TOPJOB® S 2-wire disconnect and measuring terminal block with touch-proof test sockets; test plug Ø 4 mm

To measure 2-phases to neutral, connect one phase to input L1, the second phase to inputs L2+L3 and neutral to input N. The UFR1001E will then measure the voltage between the two phases and neutral (N) and will switch off if the voltage in one of the phases reaches a limit value.

(N) connected – only for programs with N
It will not measure the voltage between the phases. It measures phases to “0” (N)!
One phase Application connect L1-L2-L3, 2 phase Application L1/L2+L3 (only Pr. 5, 7,10,13 and 20)

Link 1

How does the UFR1001E comply with the reverse switching ratios according to VDE-AR-N 4110:2018-11?
The certificate confirms on page 7
compliance with the drop-out ratios. These are permanently stored in the device software and cannot be changed.
The drop-out ratio has nothing to do with the adjustable hysteresis.


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