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The test is performed by simulating the motor protection signal via EPAC local controls:
Required user level: or higher.Specialist (4)
Simulation value: Thermal test
Figure 12: Display indication on local controls
The simulation (active/inactive) is activated and deactivated by push button Ok.
A dot on the display indicates that the simulation is active.
Black dot (●): Motor protection simulation active (thermal fault) .
White dot (○): Signal not active
8.4.4 Safe ESD reaction to “Limit seating with overload protection” (limit and/or torque evaluation): check
This test is required for the following versions or configurations:
• Actuator with electromechanical control unit (MWG.2)
• One of the following safety functions:
- Safe ESD function “Safe CLOSING” (Safe ESD in direction CLOSE)
- Safe ESD function “Safe OPENING” (Safe ESD in direction OPEN)
• Configuration of “SIL seating”
= “Limit seating with overload protection”
(Safety operation is stopped by limit switch tripping and/or torque switch tripping
(overload protection).
During the test, the reaction of the Safe ESD function to limit switch tripping during safety
operation is checked.
1. Operate actuator in mid-position or at sufficient distance from the end positions.
2. Execute operation command in opposite direction of the configured Safe ESD
safety function:
- For “Safe CLOSING” (Safe ESD in direction CLOSE) configuration: Start
operation command in direction OPEN.
- For ““Safe OPENING” (Safe ESD in direction OPEN) configuration: Start
operation command in direction CLOSE.
Information: For the test, operation commands (in directions OPEN or CLOSE) can
be executed both from remote (via DCS) and from Local at the controls (via the
push buttons of the local controls).
3. Start safety operation during operation:
- Set Safe ESDa and Safe ESDb input signals to 0 V (low).
® Safety function is correct if the actuator stops and performs a safety operation into
the configured direction.
® No SIL fault signal may be issued.
4. Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the test.
1. Operate actuator in mid-position or at sufficient distance from the end positions.
2. Set selector switch to position 0 (OFF).
3. Change to main menu and select the Thermal test simulation value via the Proof test
(motor prot.) parameter M1021 (Do not yet activate simulation: white dot).
4. Set Safe ESDa and Safe ESDb input signals to 0 V (low).
® Safety operation is initiated.
5. Activate motor protection simulation: Press push button Ok (black dot)
® Safety function is correct, if:
- For “SIL motor protection” = active configuration:
- Safety operation is stopped.
- A SIL fault signal is issued via the SIL failure output.
- For “SIL motor protection” = inactive configuration:
- Safety operation is not stopped.
- Nevertheless, a SIL fault signal is issued via the SIL failure output.
6. Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the test.
7. Reset simulation or exit the simulation menu and reset selector switch to initial position.
Multi-turn actuators
SA series with Control 3.XX /NI/SIL
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