Component Description / Function; The Following Conditions Prevent The Start-Up Process; The Following Conditions Interrupt The Start-Up Process; Scope Of Protection - ehb electronics ehb5040 Series Operating Instructions Manual

SSR

Component Description / Function

The SSR protects the starter, the pinion and the engine sprocket. It prevents accidental starting when
the engine is already running or when it is still shutting down.
The SSR is an electronic relay that is switched between terminal 30 and the starter (terminal 50f). The
engine speed is measured at terminal W of the alternator. The connections on terminals 15 and 31 are
for supplying power.
The D+ connection is required for some alternators for extra excitation. During the start operation, the
SSR switches on voltage to the D+ connection in parallel with the charging light. This ensures that
even at low speeds, the W terminal provides clear signals for speed detection.

2.1 The following conditions prevent the start-up process:

There is already voltage present at input terminal W.
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- A frequency >=. 4 Hz is measured at input terminal W.
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2.2 The following conditions interrupt the start-up process:

- The measured frequency at terminal W exceeds the specified cutoff frequency
ehb5040-8 : cutoff frequency 200 Hz
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ehb5040-4 : cutoff frequency 54 Hz
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ehb5040-10: cutoff frequency 170 Hz
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- No signal is measured or GND is applied to terminal W (line break detection).

2.3 Scope of Protection

Start inhibited while the engine is running
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Start inhibited while the engine is shutting down
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Restart inhibitor
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Switch off the starter when the cut-off frequency (e.g. 200 Hz) at terminal W is exceeded
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Start length is limited to 60sec
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2.4 Safety Concept

The SSR is plus switching.
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All outputs are protected against overloading by short circuit detection.
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In case of overload, the current at the outputs is limited.
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The output transistors switch off in case of overtemperature.
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Operating Instructions
Vers. 2.4 © ehb errors excepted