YASKAWA Z1000 series HVAC dedicated frequency converter

YASKAWA Z1000 series HVAC dedicated frequency converter

Applicable models:

200V level: 2.2~110kW (3~150HP);

400V level: 2.2~370kW (3~500HP);

Model identification: CIMR-ZU  A series.

Core positioning: A practical guide for engineering and technical personnel, covering the entire process from parameter initialization, motor debugging to troubleshooting, supporting multiple modes such as V/f control and PM motor open-loop vector control, and adapting to the dynamic adjustment needs of HVAC systems.

Core functional framework

The document revolves around three core modules: parameter configuration, function implementation, debugging and maintenance. The core modules include parameter details, regular inspection and maintenance, and communication protocol configuration (BACnet/APOGEE FLN/Metasys N2/EMOBU/Modbus), forming a complete closed loop of "setup run monitoring maintenance".

Core parameter configuration (classified by functional modules)

1. Initialize parameters (Group A)

The core is used for initial driver settings, including basic configurations such as language, control mode, parameter reset, etc.

A1-00 (Language Selection): Supports English, Japanese, French, Spanish, Portuguese, and does not reset this parameter during initialization.

A1-02 (Control mode selection): 0 (Induction motor V/f control, speed range 1:40), 5 (PM motor open-loop vector control, speed range 1:20).

A1-03 (Parameter Initialization): Supports multiple initialization modes such as user-defined, 2-wire/3-wire control, HVAC dedicated, OEM bypass, etc., and automatically returns to 0 after reset.

A1-04/A1-05 (password setting): A1-05 hides the parameter setting password, A1-04 unlocks by entering the password, and restricts the modification permission of core parameters (such as A1-01~A1-03).

2. Application Function Parameters (Group B)

Focus on core application functions such as operating mode, braking, speed search, PI control, etc., and adapt to HVAC load characteristics.

(1) Operation mode selection (b1 group)

B1-01 (AUTO mode frequency source): Supports four input methods: HOA keyboard, analog terminal, communication, and tab.

B1-02 (AUTO mode operation command): Optional control terminals, communication, and tab triggers. Selecting 3 when no tab is installed will trigger the oPE05 error.

B1-03 (stop mode): 0 (slope stop), 1 (free stop), 2 (DC injection brake stop), 3 (free stop with delay).

(2) PI control (b5 group)

Specially designed for closed-loop control of pressure, flow, and temperature in HVAC systems, with core parameters:

B5-01 (PI function enabled): 0 (disabled), 1 (PI output directly as frequency command), 3 (PI output combined with frequency command).

B5-02/B5-03 (Proportional/Integral Parameters): Proportional gain of 0.00~25.00, integration time of 0.0~3600s, can suppress overshoot or accelerate response speed.

B5-12 (PI feedback loss detection): Supports low/high feedback detection, can set alarms, faults, or only output signals to avoid sensor failures causing system loss of control.

(3) Energy saving function (b8 group)

B8-01 (Energy saving control enable): When enabled, automatically optimize the motor operating voltage to improve light load efficiency. PM motors should be used with caution.

3. Motor parameters (Group E)

The core parameter configuration covering induction motors and PM motors directly affects control accuracy.

E1 group (V/f mode setting): E1-03 selects V/f curve (15 presets+1 customization), suitable for constant torque, variable torque (fan/pump), high starting torque and other scenarios.

E2 group (induction motor parameters): requires input of motor rated current (E2-01), rated slip (E2-02), no-load current (E2-03), etc., supporting automatic tuning and automatic acquisition.

E5 group (PM motor parameters): Only visible when A1-02=5, stator resistance (E5-05), d/q-axis inductance (E5-06/E5-07), induced voltage constant (E5-09/E5-24), etc. need to be set.

4. Protection function parameters (L group)

Comprehensively ensuring the safety of drivers, motors, and systems, with core components including:

Motor protection (L1 group): L1-01 selects overload protection type (general motor/PM motor), supports PTC thermistor connection (L1-03~L1-05) to detect motor temperature.

Power protection (L2 group): L2-01 is configured with instantaneous power failure response strategy, and L2-05 is set with undervoltage detection level (default 190V for 200V level, default 380V for 400V level).

Lock rotor protection (L3 group): Install lock rotor protection during acceleration, deceleration, and operation to avoid motor overload or overvoltage faults.

Fault restart (L5 group): L5-01 sets the number of automatic restarts (0-10 times), supports automatic recovery after overcurrent, overload, overvoltage and other faults, and the lifting application is disabled.

5. Terminal functional parameters (H group)

Configure digital/analog input/output terminals to achieve external signal interaction.

H1 group (digital input): 7-channel programmable terminals (S1~S7), supporting functions such as forward and reverse rotation, multi-stage speed, fault reset, emergency stop, etc., and can be configured with 2-wire/3-wire control logic.