Drive with bypass

Version 1.0 · updated October 21, 2026

Click to zoom

This sample uses these resources

The symbols are blocks from our own libraries, with their attributes filled in. The sheet and its title block come from our ISO A3 title block template. Download them to draw your own diagrams.

• Title block templates (ISO A3 and more)Sheet frame and title block of this sample
• Common electrical symbols (IEC 60617)15 of its symbols are used here

Title block fields

The attributes of the title block. Double-click it to fill them in, or write them for a whole set of drawings with BlockSync.

Revision table: R1 to R4, each with REV, DATE, DESCRIPTION and BY (16 attributes, empty in this sample).

Blocks in the drawing

The equipment list of the drawing: block name, symbol and how many times it is placed. BlockSync exports the same list from your own drawings.

Symbol	Block	Placed
Junction	IEC_JUNCTION	19
Auxiliary contact, NC	IEC_AUX_CONTACT_NC	4
Contactor, 3-pole	IEC_CONTACTOR_3P	3
Relay / contactor coil	IEC_COIL	3
Terminal	IEC_TERMINAL	2
Selector switch, NO	IEC_SELECTOR_NO	2
Auxiliary contact, NO	IEC_AUX_CONTACT_NO	2
Signal lamp	IEC_LAMP	2
Circuit-breaker, 3-pole	IEC_CIRCUIT_BREAKER_3P	1
Frequency converter	IEC_FREQUENCY_CONVERTER	1
Thermal overload relay, 3P	IEC_THERMAL_RELAY_3P	1
Motor, three-phase	IEC_MOTOR_3PH	1
Earth (ground)	IEC_EARTH	1
Fuse	IEC_FUSE	1
Thermal overload contact, NC	IEC_THERMAL_CONTACT_NC	1

Equipment schedule

One row per placed symbol, read from the attributes of the blocks in the drawing: what is shown on the sheet, and the schedule attributes that were filled in but are not shown. BlockSync exports these same attributes from your own drawings.

Manufacturer, model and remarks are left empty on every block, ready for your data. The values are examples.

More drawings in this series

• Direct on lineA 7.5 kW motor started across the line: circuit breaker, contactor and thermal overload relay in the power circuit; stop and start buttons with a hold-in contact, and run and stop lamps in the control circuit.
• Forward and reverseA reversing starter for a 7.5 kW motor: two contactors that swap two phases, a shared stop button, separate forward and reverse buttons, and interlock contacts so that both contactors can never be on at once.
• Star-deltaA star-delta starter for a 15 kW motor: line, star and delta contactors, a motor with six terminals, an on-delay timer that changes over from star to delta, and interlock contacts so that star and delta can never be on together.
• Soft starterA soft starter for a 15 kW motor: breaker, line contactor, the soft starter drawn in single-line form with three-phase marks, a thermal overload relay and the motor, with a control circuit where the line contactor enables the soft starter and lights the run lamp.
• Variable frequency driveA 15 kW pump on a variable frequency drive: breaker, frequency converter, screened motor cable and motor, with the drive control terminals wired to a run switch, a speed potentiometer, a dual-channel emergency stop for safe torque off, the motor thermistor, two relay-output lamps and a panel ammeter.
• Hoist drive with brakeA crane hoist drive: line contactor, converter drawn with its terminals, braking resistor and a motor with a holding brake. The control circuit has an emergency stop, up and down relays with limit switches and interlocks, and a brake coil released by a relay output of the drive.
• Two-speed motorA two-speed fan motor with a pole-changing winding: low-speed and high-speed contactors, each with its overload relay, a star-point contactor, the six motor terminals with two phases swapped at high speed, and a control circuit with a shared stop circuit, two start buttons and interlocks.