Installing A Motor Thermal Overload (Ol) Relay On The Drive Output - YASKAWA Z1000 User Manual

Model
Fig. W H
2A0143
2A0169 444 824
6
2A0211 (17.48) (32.44)
2A0273
4A0005
182 383
4A0008 1
(7.17) (15.08)
4A0011
4A0014
182 473
4A0021 2
(7.17) (18.62)
4A0027
4A0034 260 550
3
4A0040 (10.24) (21.65)
4A0052
4A0065 320 585
4
4A0077 (12.60) (23.03)
4A0096
380 746.4
4A0124 5
(14.96) (29.39)
4A0156
444 824
4A0180 6
(17.48) (32.44)
4A0240
556 1083
4A0302 7
(21.89) (42.64)
u

Installing a Motor Thermal Overload (oL) Relay on the Drive Output

Motor thermal overload relays protect the motor by disconnecting power lines to the motor due to a motor overload condition.
Install a motor thermal overload relay between the drive and motor:
• When operating multiple motors on a single AC drive.
• When using a power line bypass to operate the motor directly from the power line.
It is not necessary to install a motor thermal overload relay when operating a single motor from a single AC drive. The AC
drive has UL recognized electronic motor overload protection built into the drive software.
Note: 1. Disable the motor protection function (L1-01 = 0) when using an external motor thermal overload relay.
2. Create a sequence to produce an external fault (coast to a stop) when triggered.
n General Precautions when Using Thermal Overload Relays
Consider the following application precautions when using motor thermal overload relays on the output of AC drives to prevent
nuisance trips or overheat of the motor at low speeds:
• Low speed motor operation
• Use of multiple motors on a single AC drive
• Motor cable length
• Nuisance tripping resulting from high AC drive carrier frequency
Low Speed Operation and Motor Thermal oL Relays
Generally, thermal relays are applied on general-purpose motors. When general-purpose motors are driven by AC drives, the
motor current is approximately 5% to 10% greater than if driven by a commercial power supply. In addition, the cooling
capacity of a motor with a shaft-driven fan decreases when operating at low speeds. Even if the load current is within the motor
rated value, motor overheating may occur. A thermal relay cannot effectively protect the motor due to the reduction of cooling
at low speeds. For this reason, apply the UL recognized electronic thermal overload protection function built into the drive
whenever possible.
UL Recognized Electronic Thermal Overload Function of the Drive
Speed-dependent heat characteristics are simulated using data from standard motors and force-ventilated motors. The motor
is protected from overload using this function.
Using a Single Drive to Operate Multiple Motors
Set parameter L1-01 to 0 to disable thermal overload protection for the drive.
Note: The UL recognized electronic thermal overload function cannot be applied when operating multiple motors with a single drive.
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
W1 W2 H1 H2
414 244 156.5 156
(16.30) (9.61) (6.16) (6.14) (6.14)
Three-Phase 400 V Class
150 62.5 115
–
(5.91) (2.46) (4.53) (4.53)
150 57.5 110
–
(5.91) (2.26) (4.33) (4.33)
230 130 520 150
(9.06) (5.12) (20.47) (5.91) (5.91)
285 555 113
–
(11.22) (21.85) (4.45) (4.45)
350 170 142.7 140
(13.78) (6.69) (5.62) (5.51) (5.51)
414 244 156.5 156
(16.30) (9.61) (6.16) (6.14) (6.14)
529 325 144 150
(20.83) (12.80) (5.67) (5.91) (5.91)
Dimensions mm (in)
H3 H4 H5 H6 H7
156 156 156.5 21.5 24.2
(6.14) (6.16) (0.85) (0.95)
115 62.5
– –
(2.46)
110 110 57.5
–
(4.33) (2.26)
150 150
– –
(5.91)
113 113 113
–
(4.45) (4.45)
140 140 142.7 20.5 20.5
(5.51) (5.62) (0.81) (0.81)
156 156 156.5 21.5 24.2
(6.14) (6.16) (0.85) (0.95)
150 150 150 150 144
(5.91) (5.91) (5.91) (5.67)
6.5 Installing Peripheral Devices
H8 H9 H10 H11
30.8 21.5
– –
(1.21) (0.85)
– – – – –
– – – – –
– – – – –
– – – – –
21.9 20.5
– –
(0.86) (0.81)
30.8 21.5
– –
(1.21) (0.85)
22.5 28 29 22.5
(0.89) (1.10) (1.14) (0.89)
A B
385 726
(15.16) (28.58)
118 324
(4.65) (12.76)
118 414
(4.65) (16.30)
194 473
(7.64) (18.62)
239 508
(9.41) (20.00)
320 663
(12.60) (26.10)
385 726
(15.16) (28.58)
499 981
(19.65) (38.62)
6
265